CompTIA A+ 220-1201 & 220-1202 Flashcards: Core 1 and Core 2
Review current CompTIA A+ V15 Core 1 and Core 2 objectives with original flashcards for hardware, networking, operating systems, security, commands, and troubleshooting.
关于这套卡组
CompTIA A+ 220-1201 & 220-1202 Flashcards: Core 1 and Core 2
Review the current V15 knowledge behind both CompTIA A+ exams in one 520-card package: 270 cards for Core 1 and 250 for Core 2. The deck covers mobile devices, networking, hardware, virtualization, cloud concepts, operating systems, security, commands, software support, operational procedures, and troubleshooting.
What the cards practice
The cards connect technologies, components, protocols, commands, and common acronyms with their purposes and key behavior. Separate retrieval prompts also work in the useful opposite direction: a technician task or requirement points to the right tool, setting, command, connector, or protocol. Short support scenarios ask for a likely cause, the first useful check, or the next corrective action. Ordered workflows are practiced only when the order matters on the job.
The deck does not mechanically reverse every fact or turn every source bullet into a card. It leaves out low-value acronym production, giant list prompts, unstable click paths, advanced material beyond the V15 entry-level boundary, and near-duplicate wording made only to increase the count.
Learning order
Core 1 starts with mobile hardware and connections, then builds through networking, physical hardware, virtualization, and cloud concepts before applying them to hardware and network troubleshooting. Core 2 moves from operating-system foundations into tools, commands, configuration, security, software troubleshooting, and day-to-day support operations. Inside each topic, recognition comes before selection and short diagnosis. Related forward and reverse cards are kept apart so one prompt does not give away the next.
Labs and PBQs
Flashcards are useful for recall and compact scenario decisions. They do not reproduce hands-on labs, performance-based questions, live command output, or the pressure and ambiguity of the certification exams. Use a real machine, lab environment, and lawful practice tests alongside this deck for installation, configuration, repair, and PBQ-style work.
Scope, provenance, and reuse
The live CompTIA Core 1 and Core 2 V15 pages and the current version 4.0 objective PDFs were reviewed on September 1, 2026. Both PDFs were last modified on November 25, 2025. They were used only to check the exam version, domain boundaries, weighting, and technical scope. Common technical facts are explained in original language and organized for retrieval practice. Public overview pages from three study tools were compared only for structure and learner expectations; their cards, questions, examples, explanations, and course text were not drafting input.
The Common knowledge · CC0 1.0 label applies to the deck’s original prompts, answers, organization, metadata, and generated cover to the extent applicable rights exist. It does not claim ownership of technical facts, CompTIA names, or third-party source material.
This deck is independently authored and unofficial. It is not affiliated with, endorsed by, or sponsored by CompTIA, Inc., and it uses no CompTIA logo or official trade dress.
No CompTIA exam questions, answers, performance-based questions, mark schemes, or objective wording were copied.
Current official requirements: Core 1 V15 (220-1201), Core 1 objectives PDF, Core 2 V15 (220-1202), and Core 2 objectives PDF.
这套卡组中的卡片
卡片 1
问题
What is the safe response to a swollen mobile-device battery?
答案
Power the device off, disconnect external power, and isolate it for approved battery service. Don't charge, puncture, press, or keep using the battery.
卡片 2
问题
Which RAM form factor is common in serviceable laptops?
答案
A SO-DIMM. Match its DDR generation, capacity support, and other platform requirements before installation.
卡片 3
问题
What should you confirm before replacing laptop keys or a keyboard?
答案
Confirm the model's replaceable unit and service procedure. Some keys are individually serviceable; other designs require the keyboard or full top case.
卡片 4
问题
What protects data during a laptop HDD or SSD replacement?
答案
A verified backup and migration plan. Also match the replacement drive's interface, form factor, and supported capacity.
卡片 5
问题
How should tiny antenna leads be handled during wireless-card service?
答案
Label their positions, lift each connector straight up with the proper tool, and reconnect it to the marked terminal. Pulling the wire can damage the lead.
卡片 6
问题
Which built-in laptop components commonly provide physical privacy or identity checks?
答案
Components such as fingerprint or facial-recognition hardware and near-field credential readers. Their firmware, drivers, permissions, and enrollment must all support the feature.
卡片 7
问题
Why does Wi-Fi antenna placement matter after a laptop repair?
答案
Correct routing and terminal placement preserve signal quality. A pinched cable, loose connector, or swapped main/aux lead can weaken wireless performance.
卡片 8
问题
A replacement laptop camera has no image. What should you check before replacing it again?
答案
Check its internal cable, privacy shutter or switch, firmware detection, driver, and app permission. A hardware replacement won't fix a blocked camera setting.
卡片 9
问题
A built-in mobile-device microphone is silent. What should you check first?
答案
Check the selected input, mute state, app permission, and microphone opening. Then inspect the internal connection if every app fails.
卡片 10
问题
Why disconnect the internal battery before replacing laptop RAM, storage, or a display assembly?
答案
To remove standby power from the board and reduce short-circuit risk. Follow the model's shutdown and battery-disconnection procedure.
卡片 11
问题
What should guide any field replacement inside a thin mobile device?
答案
The manufacturer's service instructions, warranty terms, and ESD precautions. Adhesives, hidden cables, and replaceable assemblies vary by model.
卡片 12
问题
How do USB-C, microUSB, and miniUSB differ?
答案
They are different connector shapes. USB-C is reversible; microUSB and miniUSB are older keyed designs, and none of the shapes alone guarantees a data speed.
卡片 13
问题
What can a laptop docking station add through one host connection?
答案
Power, displays, networking, storage, and peripheral ports. The host, dock, cable, and software must support the promised features.
卡片 14
问题
What must match for a stylus to support pressure or precision input?
答案
The stylus technology and the device's digitizer. A generic capacitive stylus may act like a finger but can't add unsupported active-pen features.
卡片 15
问题
Which connector is associated with many older Apple mobile devices?
答案
Lightning. Match the cable to the actual model because newer Apple devices may use USB-C.
卡片 16
问题
How do a headset, external speaker, and webcam extend a mobile workstation?
答案
A headset adds private audio input/output, a speaker adds room audio, and a webcam adds video input. Select each one in the app after connecting it.
卡片 17
问题
How do a trackpad, drawing pad, and trackpoint differ?
答案
A trackpad senses finger gestures, a drawing pad captures pen input, and a trackpoint moves the pointer from a small keyboard-mounted stick.
卡片 18
问题
What is NFC commonly used for on a mobile device?
答案
Very short-range exchanges such as tap-to-pay, credential reading, or quick pairing. Its short working distance supports deliberate tap-style use.
卡片 19
问题
How is a port replicator different from a full docking station?
答案
A port replicator mainly exposes additional connectors; a dock commonly adds broader capabilities such as charging, displays, or networking. Verify the product's actual feature list.
卡片 20
问题
Which connection is the usual choice for nearby mobile headsets and keyboards?
答案
Bluetooth. It provides short-range wireless accessory links with relatively low power use.
卡片 21
问题
What does mobile tethering or hotspot mode do?
答案
It shares the device's internet connection with another client, commonly over Wi-Fi, USB, or Bluetooth. The carrier plan may limit tethering or data use.
卡片 22
问题
How do 3G, 4G, and 5G relate on a mobile device?
答案
They are cellular network generations. Newer generations can offer more capacity or lower latency, but the device, SIM or eSIM, plan, coverage, and local network determine service.
卡片 23
问题
What is the practical difference between a SIM and an eSIM?
答案
A SIM is a removable identity module; an eSIM stores a carrier profile in embedded hardware. Both associate the device with cellular service.
卡片 24
问题
What sequence pairs a Bluetooth accessory safely?
答案
Enable Bluetooth, put the accessory in pairing mode, select the intended device, confirm any PIN or code, and test the connection.
卡片 25
问题
How do GPS and cellular location services complement each other?
答案
GPS derives position from satellites, while cellular and nearby-network data can speed or assist location. App permission and device settings control access.
卡片 26
问题
Which radios should you check when a phone has neither local Wi-Fi nor wide-area data?
答案
Check Wi-Fi and cellular data separately, along with airplane mode. One radio can be disabled while the other remains available.
卡片 27
问题
What should you verify when adding mail to a mobile device?
答案
Verify the account, credentials, incoming and outgoing server settings, security method, and network access. A correct password can't repair a wrong server setting.
卡片 28
问题
A phone can browse on Wi-Fi but not through its hotspot. What should you check?
答案
Check that hotspot service is enabled, cellular data works, the plan permits tethering, and the client has the correct hotspot password.
卡片 29
问题
How should you test a newly configured mobile connection?
答案
Test the intended path and service: join the correct network or carrier, verify addressing or signal, then open the required app or destination.
卡片 30
问题
What does mobile device management provide?
答案
Central enrollment, device configuration, policy enforcement, corporate-app deployment, inventory, and approved remote actions.
卡片 31
问题
How do corporate-owned and BYOD management profiles usually differ?
答案
Corporate-owned devices normally allow broader organizational control; BYOD profiles should isolate managed work data and respect the user's personal data under policy.
卡片 32
问题
What should be checked when calendar, contacts, or business mail stops synchronizing?
答案
Check connectivity, account sign-in, sync scope, device time, storage, and service status before removing the account.
卡片 33
问题
Why do data caps matter to mobile synchronization?
答案
Large mail, cloud-storage, or app sync jobs can consume metered cellular data. Choose what syncs and whether Wi-Fi is required.
卡片 34
问题
When is an MDM remote wipe appropriate?
答案
When policy authorizes removal of protected data from a lost, stolen, retired, or reassigned device. Confirm the exact device and wipe scope first.
卡片 35
问题
What is the point of separating corporate apps and data on a personal phone?
答案
It lets the organization enforce work controls and remove managed data without treating the user's whole device as corporate property.
卡片 36
问题
How do TCP and UDP differ?
答案
TCP provides connection-oriented, ordered, acknowledged delivery; UDP sends low-overhead datagrams without built-in ordering or retransmission.
卡片 37
问题
Which ports are associated with classic FTP?
答案
TCP 21 carries control traffic, and TCP 20 is the traditional active-mode data port. FTP doesn't encrypt credentials or content by itself.
卡片 38
问题
Which default port does SSH use, and what does it provide?
答案
TCP 22. SSH provides encrypted remote command-line access and related secure services.
卡片 39
问题
Which default port is traditionally used for SMTP server-to-server relay?
答案
TCP 25. Mail clients commonly submit outgoing mail through a separate authenticated service.
卡片 40
问题
Which port does DNS use?
答案
Port 53: usually UDP for ordinary queries and TCP when the response or operation requires it.
卡片 41
问题
Which ports carry DHCP client and server traffic?
答案
UDP 68 for the client and UDP 67 for the server. A new client can broadcast before it has an address.
卡片 42
问题
Which ports distinguish HTTP from HTTPS?
答案
HTTP normally uses TCP 80; HTTPS normally uses TCP 443 and protects the session with TLS.
卡片 43
问题
Which default port does POP3 use without TLS?
答案
TCP 110. POP3 commonly downloads messages rather than synchronizing server-side folders like IMAP.
卡片 44
问题
Which ports are associated with NetBIOS over TCP/IP?
答案
Ports 137–139. Name service commonly uses 137, datagram service 138, and session service TCP 139.
卡片 45
问题
Which default port does LDAP use?
答案
Port 389, commonly TCP. LDAP provides directory queries and updates; protect credentials with an approved secure configuration.
卡片 46
问题
Which default port does SMB/CIFS commonly use?
答案
TCP 445. SMB commonly carries file and printer sharing.
卡片 47
问题
Which default port does RDP use?
答案
TCP 3389. RDP provides remote graphical access to a Windows system.
卡片 48
问题
Which default port does Telnet use, and why is it avoided on untrusted networks?
答案
TCP 23. Telnet sends remote-terminal traffic without SSH's encryption.
卡片 49
问题
Which default port does IMAP use without TLS?
答案
TCP 143. IMAP keeps mailbox state and folders synchronized on the server.
卡片 50
问题
How do common 802.11 families map to Wi-Fi bands?
答案
802.11b/g use 2.4 GHz; 802.11a/ac use 5 GHz; 802.11n can use 2.4 or 5 GHz; 802.11ax can use 2.4 or 5 GHz, with Wi-Fi 6E extending it to 6 GHz.
卡片 51
问题
What is the tradeoff when selecting a wider Wi-Fi channel?
答案
A wider channel can carry more data but occupies more spectrum and may overlap more neighbors. Use a width that clients, regulations, and local conditions support.
卡片 52
问题
What networking role does Bluetooth fill?
答案
Short-range personal-area links for accessories and nearby devices. It trades range and throughput for convenience and relatively low power use.
卡片 53
问题
How do the 2.4, 5, and 6 GHz Wi-Fi bands generally differ?
答案
2.4 GHz usually reaches farther but is crowded; 5 GHz offers more capacity with less wall penetration; 6 GHz adds clean spectrum for compatible devices but typically has the shortest reach.
卡片 54
问题
How does NFC differ from general-purpose Wi-Fi?
答案
NFC handles deliberate, very short-range exchanges; Wi-Fi provides a longer-range network connection with much higher throughput.
卡片 55
问题
What should guide Wi-Fi channel selection?
答案
Local regulations, a spectrum or Wi-Fi survey, channel width, band support, interference, and neighboring use. Choose from measured conditions, then retest where users work.
卡片 56
问题
What is RFID used for?
答案
Identifying or tracking tagged objects by radio. Readers can work with passive or powered tags at ranges set by the RFID system.
卡片 57
问题
What distinguishes Wi-Fi 6E from ordinary Wi-Fi 6 operation?
答案
Wi-Fi 6E permits compatible 802.11ax devices to use the 6 GHz band. Both the client and access point must support that band.
卡片 58
问题
How do DNS and DHCP server roles differ?
答案
DNS resolves names to records; DHCP leases IP configuration such as an address, mask, gateway, and DNS servers.
卡片 59
问题
How do file and print servers centralize shared resources?
答案
A file server hosts shared data and permissions; a print server manages printer queues, drivers, and access.
卡片 60
问题
How do mail and web servers differ?
答案
A mail server transfers or stores messages; a web server returns site or application content over HTTP or HTTPS.
卡片 61
问题
Why would a network use both syslog and NTP servers?
答案
Syslog centralizes event messages, while NTP aligns device clocks so those events have comparable timestamps.
卡片 62
问题
How do AAA and database servers differ?
答案
An AAA server handles authentication, authorization, and accounting; a database server stores and queries structured application data.
卡片 63
问题
How do a spam gateway and a proxy serve different traffic?
答案
A spam gateway filters mail flow; a proxy relays client requests and may enforce filtering, logging, or caching for supported services.
卡片 64
问题
How do a UTM appliance and a load balancer differ?
答案
A UTM combines gateway security controls; a load balancer distributes requests across service instances for capacity or availability.
卡片 65
问题
Why do legacy and embedded network systems need cautious support planning?
答案
They may have fixed software, limited interfaces, or long service lives. Isolate them, preserve required compatibility, and change them only within vendor and operational constraints.
卡片 66
问题
What does SCADA monitor or control?
答案
Industrial processes and equipment. Availability and physical safety requirements belong in every support decision.
卡片 67
问题
Why are IoT devices often placed on a separate network?
答案
Segmentation limits what an outdated or compromised device can reach and makes its traffic easier to manage.
卡片 68
问题
Match DNS A, AAAA, CNAME, and MX records to their jobs.
答案
A maps a hostname to IPv4, AAAA maps it to IPv6, CNAME aliases one hostname to another, and MX identifies a domain's mail exchangers.
卡片 69
问题
How do a DHCP scope and exclusion differ?
答案
The scope defines the address pool and options DHCP can offer; an exclusion removes selected addresses from automatic leasing.
卡片 70
问题
What does a VLAN create on switched infrastructure?
答案
A logical Layer 2 broadcast domain. It separates traffic without requiring a different physical switch for every segment.
卡片 71
问题
What does a VPN protect?
答案
Traffic across an untrusted network by creating an authenticated encrypted tunnel. Endpoint security and resource permissions still matter.
卡片 72
问题
How do DNS TXT records support SPF, DKIM, and DMARC?
答案
TXT records publish mail-policy data: SPF lists authorized senders, DKIM exposes keys for signature checks, and DMARC sets alignment policy and reporting.
卡片 73
问题
How do a DHCP lease and reservation differ?
答案
A lease is a time-limited address assignment; a reservation consistently offers a chosen address to a specific client, usually by MAC address.
卡片 74
问题
How do access and trunk switch ports handle VLANs?
答案
An access port normally carries one endpoint VLAN; a trunk carries tagged traffic for multiple VLANs.
卡片 75
问题
When would you choose a site-to-site VPN instead of a client VPN?
答案
Choose site-to-site for a persistent protected link between networks; choose a client VPN for an individual endpoint connecting remotely.
卡片 76
问题
How do routers and Ethernet switches differ?
答案
A router forwards packets between IP networks; a switch forwards local frames using learned MAC-address locations.
卡片 77
问题
What does a wireless access point do?
答案
It bridges compatible wireless clients onto a wired LAN. Routing, DHCP, and internet access may come from other devices.
卡片 78
问题
What is a patch panel's role?
答案
It passively terminates and organizes permanent cable runs. Patch cords connect those runs to active equipment such as switches.
卡片 79
问题
What is a firewall's core job?
答案
It permits or blocks traffic according to security rules. Logs help explain why expected traffic was accepted or denied.
卡片 80
问题
How do managed and unmanaged switches differ?
答案
A managed switch exposes configuration and monitoring such as VLANs; an unmanaged switch provides basic switching with little or no administration.
卡片 81
问题
How can PoE be supplied, and what must match?
答案
A PoE switch or injector can supply it. The source standard, powered device, cable, per-port state, and total power budget must be compatible.
卡片 82
问题
Match cable modem, DSL modem, ONT, and NIC to their access roles.
答案
Cable and DSL modems terminate coax and telephone-copper services; an ONT terminates provider fiber; a NIC connects the host and carries its physical MAC address.
卡片 83
问题
How do private and public IPv4 addresses differ?
答案
Private ranges are used inside networks and aren't routed on the public internet; a public address is globally routable when assigned. NAT often translates between them.
卡片 84
问题
What does a 169.254.x.x IPv4 address usually indicate?
答案
APIPA self-assignment after the host failed to obtain DHCP configuration. Check the link and path to DHCP.
卡片 85
问题
When should a SOHO device use static rather than dynamic IP configuration?
答案
Use static or reserved addressing when a predictable endpoint is required; use DHCP for ordinary clients that can accept leased settings.
卡片 86
问题
What does an IPv4 subnet mask tell a host?
答案
Which address bits identify the local network. The host uses it to decide whether to send directly or through a gateway.
卡片 87
问题
How does IPv6 addressing differ from IPv4 addressing?
答案
IPv6 uses 128-bit hexadecimal addresses; IPv4 uses 32-bit dotted-decimal addresses. Both still require correct local and routing configuration.
卡片 88
问题
What does a default gateway provide?
答案
The next hop for destinations outside the local subnet. It is normally the local router interface for that network.
卡片 89
问题
How do fiber, cable, and DSL internet access differ?
答案
Fiber carries light and offers high capacity; cable uses a shared coax access network; DSL carries broadband over telephone copper and depends strongly on line distance and quality.
卡片 90
问题
How do PAN, LAN, and WLAN differ?
答案
A PAN links one person's nearby devices, a LAN serves a local site, and a WLAN is the wireless form of a local-area network.
卡片 91
问题
When are cellular, WISP, and satellite internet useful?
答案
Cellular uses mobile coverage, a WISP uses a terrestrial provider radio link, and satellite reaches beyond many ground networks. Signal, latency, limits, and availability guide the choice.
卡片 92
问题
How do MAN and WAN scopes differ?
答案
A MAN links sites across a city or metropolitan area; a WAN spans larger geographic distances and joins multiple networks.
卡片 93
问题
What is a storage area network?
答案
A SAN is a dedicated network that presents shared block storage to servers. It is different from an ordinary user LAN or file share.
卡片 94
问题
Which tools prepare and terminate a modular copper cable?
答案
A cable stripper removes the jacket; a crimper attaches a compatible modular plug. Use the intended pinout, then test the cable.
卡片 95
问题
How do a punchdown tool and cable tester support a permanent cable run?
答案
The punchdown tool seats conductors into an IDC block; the tester checks continuity and wire-map faults after termination.
卡片 96
问题
How do a toner probe and loopback plug answer different network questions?
答案
A tone generator and probe identify a cable's far end; a loopback plug tests whether a port can transmit and receive through its own interface.
卡片 97
问题
How do a Wi-Fi analyzer and network tap differ?
答案
A Wi-Fi analyzer measures nearby wireless networks and channels; a network tap exposes a link's traffic to monitoring equipment without becoming the endpoint.
卡片 98
问题
How do IPS, TN, and VA LCD panels generally differ?
答案
IPS favors color consistency and viewing angles, TN favors fast response at low cost, and VA favors contrast. Actual panel quality still varies.
卡片 99
问题
How do OLED and Mini-LED displays produce light?
答案
OLED pixels emit their own light; Mini-LED is an LCD that uses many small backlight zones. OLED can show deep blacks, while Mini-LED can reach high brightness without organic pixels.
卡片 100
问题
What does a touchscreen digitizer do?
答案
It detects touch or compatible stylus position. The display creates the image; the digitizer reports input coordinates.
卡片 101
问题
What does an inverter do in an older LCD backlight system?
答案
It converts power for the fluorescent backlight. Modern LED-backlit panels use different driver electronics.
卡片 102
问题
How do screen resolution and pixel density differ?
答案
Resolution is the number of addressable pixels; pixel density is how tightly those pixels fit in a physical area. Both affect perceived detail.
卡片 103
问题
What do refresh rate and color gamut describe?
答案
Refresh rate is how often the image can update each second; color gamut is the range of colors the display can reproduce.
卡片 104
问题
How do Cat 5e, Cat 6, and Cat 6A Ethernet cable capabilities compare?
答案
Cat 5e commonly supports 1 Gb/s to 100 m; Cat 6 improves noise performance and can support 10 Gb/s on shorter runs; Cat 6A is designed for 10 Gb/s to 100 m.
卡片 105
问题
How do HDMI and DisplayPort fit typical display setups?
答案
Both carry digital video and audio. HDMI is common on TVs and consumer equipment; DisplayPort is common on PCs and monitors, with features set by the negotiated versions.
卡片 106
问题
What is the practical difference between T568A and T568B terminations?
答案
They place the green and orange pairs in different pin positions. Use one recognized scheme consistently at both plug and punchdown-block terminations for a normal straight-through run.
卡片 107
问题
Which cable ratings suit EMI, outdoor burial, and air-handling spaces?
答案
Unshielded twisted pair suits ordinary low-interference runs, shielded twisted pair helps with EMI, direct-burial cable resists outdoor moisture, and plenum-rated cable limits flame spread and smoke in plenum spaces.
卡片 108
问题
Match RJ11, RJ45, and F-type connectors to common cabling.
答案
RJ11 is commonly used for telephone wiring, the 8P8C connector called RJ45 for twisted-pair Ethernet, and F-type for threaded coax connections.
卡片 109
问题
How do DVI and VGA differ?
答案
DVI variants may carry digital video, analog video, or both; VGA carries analog video through a 15-pin D-sub connector.
卡片 110
问题
How do single-mode and multimode fiber differ, and which connectors may terminate them?
答案
Single-mode uses a small core for long links; multimode uses a larger core for shorter links. ST, SC, and LC are connector styles that must match the link hardware and fiber type.
卡片 111
问题
What should you infer from USB 2.0, USB 3.x, microUSB, miniUSB, USB-C, and Lightning labels?
答案
USB 2.0 and 3.x describe protocol capabilities. MicroUSB, miniUSB, and USB-C are USB connector families; Lightning is a separate Apple connector. Plug shape alone doesn't guarantee speed or video support.
卡片 112
问题
How do SATA, eSATA, and Molex relate to storage connections?
答案
SATA carries internal drive data, eSATA extends SATA to an external connector, and a Molex plug is a legacy power connector. Data and power paths are separate.
卡片 113
问题
Which legacy peripheral link commonly uses a DB9 connector?
答案
A serial connection such as RS-232. It sends data sequentially and is still used for some console and industrial equipment.
卡片 114
问题
When does a cable adapter need active electronics?
答案
When the source and destination use different signaling, not just different plug shapes. A passive adapter only changes compatible wiring; an active adapter converts the signal.
卡片 115
问题
Where are DIMM and SO-DIMM modules normally used?
答案
Full-size DIMMs normally fit desktop or server boards; shorter SO-DIMMs fit many laptops and compact systems.
卡片 116
问题
Why doesn't every USB-C cable provide Thunderbolt or display output?
答案
USB-C names the connector. Thunderbolt, USB speed, charging level, and video alternate modes require matching support from the port, cable, and device.
卡片 117
问题
Can one DDR memory generation be installed in another generation's slot?
答案
No. DDR generations use different electrical designs and keying, so the module must match the motherboard.
卡片 118
问题
How does ECC RAM differ from non-ECC RAM?
答案
ECC can detect and correct certain memory errors; non-ECC lacks that protection. The CPU and motherboard must support ECC.
卡片 119
问题
What does a dual- or multi-channel memory configuration require?
答案
Compatible modules installed in the motherboard's paired channel slots. The board manual identifies the correct population order.
卡片 120
问题
What happens when compatible RAM modules have different rated speeds?
答案
They normally operate at a mutually supported speed, often the slower module's rate. Platform and firmware limits can reduce it further.
卡片 121
问题
What limits a system's usable RAM capacity?
答案
The CPU memory controller, motherboard, firmware, operating system, and supported module layout. Check the platform documentation before buying modules.
卡片 122
问题
How do RAID 0 and RAID 1 trade capacity for protection?
答案
RAID 0 stripes data for capacity and performance but has no redundancy; RAID 1 mirrors data and can survive one member failure.
卡片 123
问题
How do 2.5-inch and 3.5-inch HDDs, spindle speed, and workload affect a drive choice?
答案
The bay and interface must fit the form factor; faster spindle speed can improve access but adds heat, noise, and power use. Workload and capacity still matter.
卡片 124
问题
How do SATA SSDs and NVMe SSDs communicate?
答案
A SATA SSD uses the SATA storage interface; an NVMe SSD uses PCIe for lower-latency flash access. The slot and firmware must support the selected signaling.
卡片 125
问题
Which removable media suit portable files, camera storage, and optical archives?
答案
USB flash drives suit general transfers, memory cards suit compact devices such as cameras, and optical discs require a drive that supports the disc format.
卡片 126
问题
How do RAID 5 and RAID 6 differ?
答案
RAID 5 needs at least three drives and tolerates one member failure; RAID 6 needs at least four and uses dual parity to tolerate two.
卡片 127
问题
What distinguishes SAS from SATA storage?
答案
SAS is an enterprise-oriented serial SCSI interface with features such as dual-port support; SATA is common in client storage. The drive and controller interface must match.
卡片 128
问题
How do M.2 and mSATA differ?
答案
M.2 is a keyed form-factor family that may carry SATA or PCIe/NVMe; mSATA is an older compact form factor that carries SATA signaling.
卡片 129
问题
When is an SSD preferable to an HDD?
答案
Choose an SSD for low-latency, shock-resistant storage; choose an HDD when low-cost bulk capacity matters more. Neither removes the need for backup.
卡片 130
问题
How do ATX, microATX, and Mini-ITX motherboard form factors affect a build?
答案
They differ in board size, mounting layout, and typical expansion capacity. The case, power supply, and required slots must fit the board.
卡片 131
问题
Match common motherboard connectors to their jobs.
答案
PCI and PCIe host expansion cards; SATA and eSATA carry storage data; M.2 hosts compact devices; headers connect case features; power connectors feed the board and CPU.
卡片 132
问题
What does RAID 10 provide?
答案
Striping across mirrored pairs, normally using at least four drives. It combines performance with redundancy, but surviving multiple failures depends on which members fail.
卡片 133
问题
What must match before installing an AMD or Intel CPU?
答案
The CPU socket, chipset, firmware, and thermal design must support that exact processor. Multisocket boards also require a supported processor combination.
卡片 134
问题
Which UEFI settings commonly control startup and hardware access?
答案
Boot order, removable-media boot, USB permissions, fan behavior, temperature monitoring, and virtualization support. Change only the setting required for the task.
卡片 135
问题
How do Secure Boot, a boot password, and a firmware setup password differ?
答案
Secure Boot verifies trusted boot software; a boot password challenges startup; a setup password restricts firmware changes.
卡片 136
问题
How do x86, x64, and ARM CPU architectures affect compatibility?
答案
They use different instruction-set families; x86 is 32-bit, x64 extends that family to 64-bit, and ARM uses a RISC design. The OS and applications need compatible builds.
卡片 137
问题
What does adding CPU cores improve?
答案
Parallel work when software can use the cores. Architecture, clock speed, cooling, memory, and workload still shape performance.
卡片 138
问题
Match sound, video, capture, and network expansion cards to their jobs.
答案
Sound cards handle audio I/O, video cards render graphics, capture cards ingest external media signals, and NICs add network connectivity.
卡片 139
问题
How do a TPM and HSM support encryption differently?
答案
A TPM is a system security chip for protected keys and platform measurements; an HSM is a dedicated device or service for controlled cryptographic key operations.
卡片 140
问题
How do fans and heat sinks work together?
答案
A heat sink spreads component heat across fins; fans move air across those fins and through the case.
卡片 141
问题
Why are thermal paste or pads placed between a chip and cooler?
答案
They fill microscopic gaps so heat transfers efficiently. Use the specified material and amount.
卡片 142
问题
What extra components does liquid CPU cooling add to diagnosis?
答案
A pump, coolant path, radiator, fans, tubing, and seals. Verify mounting, flow, airflow, and leaks.
卡片 143
问题
What hardware and firmware support may a hypervisor require?
答案
A compatible CPU virtualization feature enabled in UEFI, plus enough memory, storage, networking, and security controls for its guests.
卡片 144
问题
What must be checked when a PSU can receive 110–120 VAC or 220–240 VAC?
答案
Its input range and selector behavior. Use the local mains range and never guess with a manual voltage switch.
卡片 145
问题
What do the 3.3 V, 5 V, and 12 V PSU rails typically power?
答案
They supply different component circuits: 3.3 V and 5 V serve logic and peripherals, while 12 V commonly feeds CPU/GPU regulators, motors, and fans.
卡片 146
问题
What does a 20+4-pin ATX connector power?
答案
The motherboard's main input. The CPU normally needs a separate 4- or 8-pin EPS-style connection.
卡片 147
问题
How should PSU wattage be chosen?
答案
Add the system's realistic peak demand and sensible headroom, then confirm connector, rail, and quality requirements. A large wattage label alone doesn't prove suitability.
卡片 148
问题
What is the advantage and main caution of a modular PSU?
答案
Detachable cables reduce clutter, but only cables approved for that exact PSU should be used. Modular pinouts aren't universally interchangeable.
卡片 149
问题
What does a redundant power supply provide?
答案
Two or more power modules so one can fail without immediately stopping the system. Redundancy still needs correct capacity and monitoring.
卡片 150
问题
Why does PSU efficiency matter?
答案
Higher efficiency wastes less input power as heat at a given load. Efficiency certification doesn't replace checks for electrical quality, capacity, or connectors.
卡片 151
问题
How does a laser printer create and fix an image?
答案
It forms an electrostatic image, applies toner, and bonds the toner with a heated fuser. Toner, drum, transfer, and fuser parts all affect output.
卡片 152
问题
What should be checked when unboxing and placing a multifunction printer?
答案
Remove shipping locks, allow service clearance and ventilation, match power and network access, load supported media, and choose a stable location.
卡片 153
问题
How do PCL and PostScript printer drivers differ?
答案
PCL is common for fast office output and can vary by device; PostScript describes pages in a device-independent way that suits complex graphics. Use the printer's supported driver.
卡片 154
问题
What should be verified when choosing USB, Ethernet, or Wi-Fi for a printer?
答案
Verify the intended users, cable or signal path, addressing, security, firmware, and driver support. USB serves a local host; network links serve reachable clients.
卡片 155
问题
Which parts and maintenance tasks are typical for an inkjet printer?
答案
Ink cartridges, printheads, pickup rollers, and feeders. Clean or align printheads, replace approved cartridges, clear jams, and service feed parts as needed.
卡片 156
问题
How do printer sharing and a print server differ?
答案
A printer share exposes a queue from a host; a print server centralizes queues, drivers, permissions, and management for many clients.
卡片 157
问题
Which settings commonly change a print job's physical output?
答案
Duplex, portrait or landscape orientation, paper tray and size, and quality. The application, driver, and device settings must agree.
卡片 158
问题
Which controls protect a public or shared printer?
答案
User authentication or badging, secure print release, appropriate permissions, and audit logs. They reduce abandoned sensitive output and trace approved use.
卡片 159
问题
How does a direct thermal printer work and what maintenance does it need?
答案
Heat darkens special thermal paper. Replace the paper correctly, clean the heating element and feed path, and remove debris.
卡片 160
问题
Where can a network multifunction device send scans?
答案
Common destinations are email, an SMB file share, or an approved cloud service. Configure credentials, permissions, addressing, and encryption for the destination.
卡片 161
问题
When should you use an ADF instead of a flatbed scanner?
答案
Use the automatic document feeder for stacks of loose pages; use the flatbed for fragile, bound, thick, or single originals.
卡片 162
问题
What does printer calibration correct?
答案
Placement, density, alignment, or color registration. Run the maker's procedure after relevant part or image-quality changes.
卡片 163
问题
Why does an impact printer suit multipart forms?
答案
Pins strike an inked ribbon and physically transfer the mark through layered paper. The mechanism is noisy but can mark multiple copies.
卡片 164
问题
What does a laser-printer maintenance kit commonly refresh?
答案
Wear parts such as rollers and the fuser, as defined for that model. Replace depleted toner, install the kit at its service interval, calibrate when output shifts, and clean only through approved paths.
卡片 165
问题
How do inkjet feed and printhead maintenance address different faults?
答案
Roller and feeder service fixes paper movement; printhead cleaning or alignment fixes missing or misplaced ink. Use the symptom to choose the maintenance.
卡片 166
问题
What is a virtual machine?
答案
A software-defined computer with virtual CPU, memory, storage, and devices that runs a guest operating system on a host.
卡片 167
问题
Where does a Type 1 hypervisor run?
答案
Directly on the host hardware. This bare-metal design is common in servers and virtualization platforms.
卡片 168
问题
Why use a VM as a sandbox or test environment?
答案
It isolates a disposable environment from the main workload and makes repeatable testing easier. Isolation reduces risk but doesn't make untrusted code harmless.
卡片 169
问题
Which VM resources must be sized against real host capacity?
答案
vCPU, memory, storage space, and I/O. Overcommitting them can make several guests compete for the same hardware.
卡片 170
问题
What does application virtualization do?
答案
It packages, streams, or isolates an application from the base installation. It can simplify delivery or preserve some legacy applications without virtualizing a whole desktop.
卡片 171
问题
Where does a Type 2 hypervisor run?
答案
As an application on a host operating system. It is convenient for desktop labs, testing, and occasional guests.
卡片 172
问题
Which security layers need attention on a virtualization host?
答案
The host, hypervisor, management access, guest OSs, virtual networks, and images. Patch and isolate each layer according to its role.
卡片 173
问题
What must be planned for VM networking?
答案
Addressing, virtual switch or NAT mode, segmentation, bandwidth, and access controls. A guest still needs a deliberate path to required services.
卡片 174
问题
What does VDI deliver?
答案
Centrally hosted desktop sessions to remote clients. Compute and management stay in the data center or cloud rather than on each endpoint.
卡片 175
问题
What must be planned for VM storage?
答案
Capacity, performance, snapshots, backup, and failure location. A snapshot on the same datastore isn't a complete backup.
卡片 176
问题
How does a container differ from a typical VM?
答案
A container isolates an application while sharing the host kernel; a VM normally includes a full guest operating system.
卡片 177
问题
How can virtualization support legacy or cross-platform workloads?
答案
A compatible guest OS or virtualized application layer can preserve the required environment. CPU architecture, licenses, drivers, and hardware access still constrain compatibility.
卡片 178
问题
What does a container image provide?
答案
A repeatable application filesystem and configuration used to start containers. Running containers add temporary writable state unless storage is attached.
卡片 179
问题
A virtualization option is unavailable. What should you verify?
答案
Verify CPU and platform support, then enable the required virtualization feature in UEFI if policy allows. Also confirm that another hypervisor hasn't claimed it.
卡片 180
问题
What defines a public cloud?
答案
It is offered for open use by the general public and operated by a cloud provider. Its resources may be shared or dedicated, depending on the service.
卡片 181
问题
What does IaaS provide?
答案
Cloud compute, networking, and storage infrastructure. The customer usually manages the operating system, applications, identities, and data.
卡片 182
问题
What is cloud elasticity?
答案
The ability to add or remove resources as demand changes, automatically or on request.
卡片 183
问题
What does metered cloud utilization measure?
答案
Consumed resources such as compute time, storage, requests, or transferred data for reporting, limits, and billing.
卡片 184
问题
What defines a private cloud?
答案
Cloud infrastructure reserved for one organization. It can run on-site or be hosted and operated by a provider.
卡片 185
问题
What does SaaS provide?
答案
A complete provider-run application accessed as a service. The customer mainly manages users, settings, and data.
卡片 186
问题
How do shared and dedicated cloud resources differ?
答案
Shared resources serve multiple customers with logical isolation; dedicated resources are reserved for one customer. Either can appear in a provider's public-cloud offering.
卡片 187
问题
What is high availability designed to reduce?
答案
Service downtime from component or location failure through redundancy and failover.
卡片 188
问题
What is a hybrid cloud?
答案
A coordinated use of private-cloud and public-cloud environments, with workloads or data placed where their requirements fit.
卡片 189
问题
What does PaaS provide?
答案
A managed application platform and runtime. Developers deploy code while the provider manages more of the operating system and infrastructure.
卡片 190
问题
What do cloud ingress and egress mean?
答案
Ingress is data entering the cloud service; egress is data leaving it. Providers often meter them differently, and egress can create a notable cost.
卡片 191
问题
What does cloud multitenancy mean?
答案
Multiple customers use provider infrastructure while their workloads and data remain logically isolated.
卡片 192
问题
What is a community cloud?
答案
Cloud infrastructure reserved for organizations with shared requirements, such as a sector or policy need, rather than for unrestricted public use.
卡片 193
问题
What does FaaS run?
答案
Event-triggered functions without the customer managing servers directly. The provider manages the execution environment and scaling mechanics.
卡片 194
问题
Does using a cloud service remove the customer's security duties?
答案
No. Responsibility is shared: the provider protects its service layers, while the customer still manages assigned areas such as identities, settings, applications, and data.
卡片 195
问题
What can happen when two offline devices edit the same cloud-synchronized file?
答案
A synchronization conflict. Preserve both versions, let sync finish, compare the changes, and keep the intended content.
卡片 196
问题
A PC stops at POST with a beep or status-light pattern. What should you do next?
答案
Look up the exact pattern in the system or motherboard service documentation, then test the indicated component.
卡片 197
问题
A desktop shows no lights or fan movement. Where should power diagnosis start?
答案
At the outlet, power strip, cord, PSU input switch, and main internal power connections. Move from the source inward.
卡片 198
问题
A PC shows a proprietary crash screen. What evidence should you collect first?
答案
Record the stop code and recent hardware changes, then check memory, storage, drivers, temperature, and logs indicated by that code.
卡片 199
问题
A PC powers on but the screen stays blank. What hardware checks come first?
答案
Check display power and input, video cabling, GPU seating or power, and whether POST completes. Test one known-good display path at a time.
卡片 200
问题
A computer is sluggish under ordinary work. Which hardware conditions should you check?
答案
Check temperature and throttling, RAM pressure, storage health and free space, CPU load, and background I/O before replacing parts.
卡片 201
问题
A PC becomes unstable as CPU temperature rises. What should you inspect?
答案
Inspect fan operation, heat-sink mounting, thermal material, dust, filters, and case airflow. The CPU may throttle or shut down to protect itself.
卡片 202
问题
You smell burning from a powered computer. What is the immediate action?
答案
Shut it down and disconnect power. Don't keep testing until the damaged power or board component has been safely identified.
卡片 203
问题
A PC shuts down randomly only during heavy GPU work. What should you test?
答案
Test PSU capacity and condition, GPU power leads, temperature, and event logs. Peak load can expose weak power or cooling.
卡片 204
问题
Applications crash randomly after new RAM is installed. What should you do?
答案
Verify compatibility and slot placement, reseat the modules, and run a memory diagnostic. Test modules separately if needed.
卡片 205
问题
A computer develops an unusual fan or grinding noise. What should you inspect?
答案
Inspect fans, cables, pumps, drives, dust, and mounting points while the system is safely powered down when contact is possible.
卡片 206
问题
What should you do after finding a swollen motherboard capacitor?
答案
Disconnect power and replace the failed board or arrange qualified component service. Don't keep operating a board with a visibly failing capacitor.
卡片 207
问题
A PC loses its date and time whenever it is unplugged. What is the likely cause?
答案
A weak motherboard coin-cell battery. Replace it with the specified type and restore any lost firmware settings.
卡片 208
问题
Firmware reports less RAM than is installed. What is the first corrective step?
答案
Power down, follow ESD precautions, and reseat the modules in the recommended slots. Then test compatibility, sticks, and slots methodically.
卡片 209
问题
A newly installed CPU isn't recognized even though it fits the socket. What should you verify?
答案
Verify chipset and firmware support, CPU power, contact condition, seating, and cooling. Physical fit alone doesn't prove compatibility.
卡片 210
问题
How can you isolate a motherboard, CPU, RAM, or PSU no-POST fault?
答案
Reduce the system to minimum required hardware, confirm known-good power, and add components back one at a time.
卡片 211
问题
A storage controller shows a warning LED or audible alarm. What should you do first?
答案
Read the controller's exact status, preserve a current backup, and identify the affected drive or array before replacing anything.
卡片 212
问题
A hard drive clicks or grinds while reads fail. What should you prioritize?
答案
Stop unnecessary activity, preserve recoverable data, and replace the drive. Repeated testing can worsen a mechanical failure.
卡片 213
问题
A PC reports no bootable device. Which checks come first?
答案
Check firmware drive detection and boot order, then data and power connections. If the drive is detected, check its health before changing partitions.
卡片 214
问题
Files are corrupt or missing after storage errors. What should you do?
答案
Stop writes, preserve the affected media, restore from a verified backup when appropriate, and diagnose the drive, controller, memory, and filesystem cause.
卡片 215
问题
A controller reports an array missing. What should you avoid?
答案
Don't initialize or recreate it blindly. Check controller configuration, cabling, power, member detection, and the documented recovery path first.
卡片 216
问题
A drive has unusually long read and write times. What should you inspect?
答案
Inspect health data, errors, cable or link negotiation, free space, workload, temperature, and the storage interface.
卡片 217
问题
What should you do after a S.M.A.R.T. failure warning?
答案
Back up important data immediately and plan drive replacement. A health warning isn't something to clear and ignore.
卡片 218
问题
Firmware sees a drive, but the operating system doesn't. What should you check?
答案
Check OS storage management, drivers, bus support, partitions, and whether the disk is offline. Don't initialize a disk that may contain needed data.
卡片 219
问题
A RAID array is degraded after a member fails. What is the safe response?
答案
Confirm the failed member, verify backup, replace it through the controller's procedure, and monitor the rebuild. Don't remove a healthy member by guesswork.
卡片 220
问题
What can cause low storage IOPS even when capacity is available?
答案
A saturated or slow device, high queue depth, contention, thermal throttling, controller limits, or an unsuitable RAID layout.
卡片 221
问题
A monitor reports no signal. What should you check first?
答案
Check power, selected input, cable seating, adapter compatibility, and whether the computer is producing video.
卡片 222
问题
A projector is dim or shuts down intermittently. What should you inspect?
答案
Inspect the bulb or light source, filters, vents, temperature, brightness settings, room light, and service-life indicators.
卡片 223
问题
Text looks fuzzy or the desktop doesn't fit the screen. Which settings should you verify?
答案
Verify native resolution, scaling, aspect ratio, and any overscan setting. Then check cable and adapter quality.
卡片 224
问题
How do display burn-in and a dead pixel differ?
答案
Burn-in is persistent image retention across an area; a dead or stuck pixel is a fixed point defect. Confirm each with varied full-screen test images.
卡片 225
问题
A display flashes or flickers at a new refresh rate. What should you check?
答案
Check that the display, GPU, port, cable, resolution, and refresh rate combination is supported.
卡片 226
问题
A projected image is trapezoidal or distorted. What should you adjust?
答案
Correct projector position, angle, focus, and aspect ratio first; use keystone correction only as needed.
卡片 227
问题
A monitor shows incorrect colors. How do you isolate the cause?
答案
Check color settings and profiles, reseat or replace the cable, test another input or display, and inspect GPU output and drivers.
卡片 228
问题
Video works over HDMI or DisplayPort, but audio doesn't. What should you check?
答案
Check the OS playback device, application output, display volume, cable capability, and whether the adapter carries audio.
卡片 229
问题
A laptop LCD shows a faint image only under a flashlight. Which area is likely failing?
答案
The backlight or its power/driver path. The faint picture shows that image data still reaches the panel.
卡片 230
问题
A phone battery drains much faster than usual. What should you check first?
答案
Check battery health and recent screen, app, radio, and location use. Confirm the usage change before replacing hardware.
卡片 231
问题
A phone has a broken screen but still receives notifications. What should guide the repair?
答案
Back up accessible data, stop using sharp or exposed surfaces, and determine whether the glass, display, digitizer, or full assembly is replaceable.
卡片 232
问题
A phone won't charge and its port looks damaged. What is the safe first test?
答案
Inspect without metal tools, then try a known-good compatible cable and charger. Use wireless charging only if the device supports it and the battery is safe.
卡片 233
问题
A phone has poor or no connectivity. What should you isolate?
答案
Test Wi-Fi, cellular, and Bluetooth separately; check airplane mode, signal, account or SIM/eSIM state, and the specific network settings.
卡片 234
问题
A battery is pushing a mobile-device case apart. What should you do?
答案
Power it down, stop charging it, and arrange approved battery service. Don't press the case closed.
卡片 235
问题
A mobile device gets wet. Why should you avoid powering or charging it?
答案
Moisture can cause shorts and corrosion. Shut it down and follow the manufacturer's drying or service guidance.
卡片 236
问题
Touch input drifts or misses one area. What should you check?
答案
Check screen cleanliness and protectors, test calibration if supported, compare apps, and inspect the digitizer connection or damage.
卡片 237
问题
A phone slows down and overheats during light use. What should you inspect?
答案
Inspect battery health, storage pressure, updates, background apps, signal hunting, and possible malware. Stop use if heat is unsafe.
卡片 238
问题
A mobile device shows pop-ups and heavy data use after an untrusted install. What should you suspect?
答案
Malware or a harmful app. Disconnect as needed, preserve required evidence, remove it through the approved mobile-security process, and update the device.
卡片 239
问题
A mobile device can't install a new application. What should you check?
答案
Check free storage, OS and hardware compatibility, account or store access, network service, and MDM policy before bypassing any restriction.
卡片 240
问题
An active stylus doesn't work, but finger touch does. What should you check?
答案
Check stylus compatibility, charge or battery, pairing, tip, app support, and the device's active-digitizer settings.
卡片 241
问题
Users report slow network speeds. What should you measure before changing hardware?
答案
Measure negotiated link rate, throughput, utilization, errors, signal, channel use, and server or ISP performance to locate the bottleneck.
卡片 242
问题
Wi-Fi disconnects intermittently in one area. What should you inspect?
答案
Inspect signal strength, roaming, interference, channel plan, access-point placement, client drivers, and power-saving behavior.
卡片 243
问题
A client reports limited connectivity. Which layers should you check in order?
答案
Check physical or wireless link, IP address and mask, gateway, DHCP, DNS, and upstream reachability.
卡片 244
问题
A user repeatedly fails network authentication. What should you verify?
答案
Verify the account and credentials, time, certificate, authentication method, network policy, and whether the user or device is authorized.
卡片 245
问题
Which tools help locate high latency?
答案
Ping compares delay and loss; traceroute shows the path by hops. Test several destinations to separate a local, provider, and destination issue.
卡片 246
问题
What signs point to external wireless interference?
答案
Signal quality or throughput drops despite adequate strength, often near a device or at certain times. A spectrum or Wi-Fi analyzer helps confirm it.
卡片 247
问题
A switch port repeatedly changes between up and down. What should you isolate?
答案
Isolate the patch cable, wall run, endpoint NIC, and switch port. Review port logs and test the cable for a port-flapping cause.
卡片 248
问题
A wired PC has no link light. Where should troubleshooting start?
答案
At the cable, connector, NIC, and switch port. Changing IP settings can't repair a missing physical link.
卡片 249
问题
VoIP sounds choppy even though average bandwidth is adequate. Which network condition should you measure?
答案
Jitter, along with latency and packet loss. QoS and congestion control may help after the impaired path is identified.
卡片 250
问题
Internet access drops for every local client, then returns. Where should you look?
答案
Check the shared WAN path: the router's WAN link, modem or ONT, provider service, power, and logs. Independent failures across every local client at once are unlikely.
卡片 251
问题
A host can reach an internet IP but not a website name. What is the likely fault?
答案
DNS resolution. Check the configured resolver and test a direct lookup.
卡片 252
问题
A PC receives a 169.254.x.x address. What should you test next?
答案
Test its link and the path to DHCP. The APIPA address shows that normal lease configuration failed.
卡片 253
问题
Two hosts report an address conflict. What should you inspect?
答案
Inspect static assignments, DHCP reservations, and the lease scope for a duplicate IP address.
卡片 254
问题
A PC on a new switch port can't reach its department resources. What should you verify?
答案
Verify the access VLAN, then its routing and policy. A good physical link on the wrong VLAN still provides the wrong network access.
卡片 255
问题
A PoE camera has network pairs but no power. What should you check?
答案
Check the injector or switch standard, port state, total power budget, cable quality, and camera power requirement.
卡片 256
问题
Only one PC lacks network access while nearby systems work. What should you compare?
答案
Compare its link, IP settings, DNS, authentication, proxy or VPN state, and local firewall with a working peer.
卡片 257
问题
A printed page has a line in the same place every time. What should you inspect?
答案
Inspect the cartridge, printhead, drum, scanner glass, and approved cleaning path for contamination or damage, based on printer type.
卡片 258
问题
A printer produces garbled characters. What should you verify?
答案
Verify the driver and print language, cable or network path, firmware, and source document. Cancel the bad job before retrying.
卡片 259
问题
A printer reports a paper jam. What is the safe response?
答案
Stop the job, follow the documented paper path, remove paper in the specified direction, and check for scraps or damaged rollers.
卡片 260
问题
Several print jobs remain pending after the printer recovers. What should you do?
答案
Cancel failed jobs as appropriate, verify printer status and connectivity, restart the print service if needed, then send one small test page.
卡片 261
问题
Printed pages are uniformly faded. What should you check?
答案
Check toner or ink level, density or quality settings, cartridge condition, and the correct media setting.
卡片 262
问题
A printer makes a grinding noise. What should you do?
答案
Stop the job and inspect for jammed media, foreign objects, damaged gears, or a misseated cartridge or maintenance part.
卡片 263
问题
Paper won't feed or several sheets feed together. Which parts should you inspect?
答案
Inspect pickup rollers, the separation pad, feeder, paper condition, tray guides, and load limit.
卡片 264
问题
A document prints in the wrong orientation. What should you check?
答案
Check portrait or landscape settings in the application and driver, then confirm paper size and any device default.
卡片 265
问题
What commonly causes speckles across printed pages?
答案
Loose toner, ink contamination, a dirty print path, or a damaged cartridge or drum. Use the printer type and repeating pattern to narrow it.
卡片 266
问题
A finisher won't staple or punch pages. What should you inspect?
答案
Inspect the staple cartridge or jam, punch waste bin, finisher seating, supported paper, and driver job settings.
卡片 267
问题
A printer doesn't recognize a loaded tray. What should you check?
答案
Check tray seating, paper guides and size sensors, media settings, firmware, and driver configuration.
卡片 268
问题
A network printer shows Ready but clients can't reach it. What should you test?
答案
Test its link, IP configuration, address conflict, VLAN and routing path, print port, and firewall access.
卡片 269
问题
A laser page shows a repeated faint image. Which area should you inspect?
答案
Inspect the imaging drum and fuser for ghosting. The repeat distance can help the service guide identify the rotating part.
卡片 270
问题
A print queue is frozen and won't process a test page. What should you do?
答案
Clear the blocked job safely, restart the spooler or print service, verify disk and printer connectivity, then submit one small test.
卡片 271
问题
Which desktop OS is the usual choice for broad business software and Active Directory integration?
答案
Windows. It has the widest support for common business applications and native integration with Microsoft domain services.
卡片 272
问题
When is a clean OS installation preferable to an in-place upgrade?
答案
Choose a clean install when you need a fresh system or the existing installation is unreliable. It removes installed apps and settings, so back up user data first.
卡片 273
问题
Which Windows command lists files and folders in the current directory?
答案
dir. Usecdwhen you need to change the current directory.卡片 274
问题
Which Windows tool gives a quick view of running processes, startup apps, users, services, and performance?
答案
Task Manager. It is the first stop for a quick process or resource check.
卡片 275
问题
What should you check before moving a user between desktop or mobile operating systems?
答案
Check application, peripheral, file-format, and account compatibility first. A supported OS is still a bad fit if the user's required tools or data won't work on it.
卡片 276
问题
How should you choose between a public and private Windows network profile?
答案
Use Public on untrusted networks and Private only on trusted local networks. The profile changes discovery and firewall behavior.
卡片 277
问题
Which Windows command shows the current IP configuration?
答案
ipconfig. Add/allwhen you need details such as DHCP, DNS, gateway, and adapter addresses.卡片 278
问题
What is the main benefit of deploying an OS image?
答案
It applies a prepared, consistent system build to multiple devices. The image still needs compatible drivers, licensing, and post-deployment updates.
卡片 279
问题
Which console should you open to investigate recorded application, security, or system errors?
答案
Event Viewer. Filter by the relevant time, source, and event level instead of treating every warning as the cause.
卡片 280
问题
Which Windows file system supports permissions, encryption, compression, and large local volumes?
答案
NTFS. It is the standard Windows file system when you need access controls and other full desktop features.
卡片 281
问题
Which Windows edition fits a basic home PC that does not need business management features?
答案
Windows Home. It covers normal consumer use but lacks several business features found in Pro and Enterprise.
卡片 282
问题
What do the common macOS application forms
.dmg,.pkg, and.apprepresent?答案
A
.dmgis a mountable disk image, a.pkgruns an installer, and an.appis an application bundle. Remove software with its supported process, especially when it installed system components.卡片 283
问题
Which boot approach lets a technician start an installer delivered by a deployment server?
答案
Network boot, commonly PXE. The client firmware and network must support it, and the deployment service must be reachable.
卡片 284
问题
Which command is the quickest basic test of IP reachability to another host?
答案
ping. A failed ping is only a clue because the host or firewall may block echo traffic.卡片 285
问题
Which Windows tool creates partitions, assigns drive letters, and initializes disks?
答案
Disk Management. Confirm the disk and volume before making changes because some operations can destroy data.
卡片 286
问题
What is safer than disabling Windows Firewall when one application is blocked?
答案
Create the narrowest required application or port exception. Keep the firewall enabled and limit the rule to the needed profiles and traffic.
卡片 287
问题
What should you compare before installing a demanding application?
答案
Compare its OS, CPU, RAM, storage, graphics, VRAM, and peripheral requirements with the device. Check both minimum and practical workload needs.
卡片 288
问题
Which Windows edition is the usual minimum for joining a business domain and hosting Remote Desktop?
答案
Windows Pro. It also adds business features such as BitLocker management and Local Group Policy.
卡片 289
问题
Which Windows command queries DNS records for a name?
答案
nslookup. It helps distinguish name-resolution trouble from basic network reachability.卡片 290
问题
Which macOS feature creates versioned backups for normal file and system recovery?
答案
Time Machine. Confirm the backup destination is available and test that needed files can actually be restored.
卡片 291
问题
What makes zero-touch deployment different from a normal remote installation?
答案
Zero-touch deployment minimizes hands-on setup after the device starts. Policies, applications, and identity configuration are applied automatically.
卡片 292
问题
When is exFAT usually a better removable-drive format than FAT32?
答案
Use exFAT when the drive must move between modern operating systems and hold files larger than FAT32's 4 GB per-file limit.
卡片 293
问题
Which values must be correct in a manual IPv4 client configuration?
答案
The IP address, subnet mask, default gateway, and DNS server settings must fit the network. A wrong value can break local or internet access.
卡片 294
问题
How do FileVault and Keychain serve different security jobs on macOS?
答案
FileVault encrypts the startup disk; Keychain stores passwords, certificates, and keys. Neither replaces good account security or backups.
卡片 295
问题
What should you verify before booting an installer from USB media?
答案
Verify the media is trusted and bootable, then select the correct temporary boot device. Also confirm the firmware mode matches the planned partition style.
卡片 296
问题
Which Windows console is best for checking a device's driver status or hardware error code?
答案
Device Manager. It shows detected hardware, driver details, disabled devices, and device error codes.
卡片 297
问题
When is Windows Enterprise a better fit than Pro?
答案
Use Enterprise for centrally managed organizations that need its additional security, deployment, and control features. It is licensed for organizational use rather than a typical retail PC.
卡片 298
问题
How does a domain differ from a workgroup for Windows client management?
答案
A domain provides centralized identity and policy; a workgroup manages accounts separately on each PC. Shared resources must match the chosen model.
卡片 299
问题
Which command shows active network connections and listening ports on Windows?
答案
netstat. Use its documented options to include process IDs or numeric addresses when needed.卡片 300
问题
Which Windows tool runs a program or script on a trigger or schedule?
答案
Task Scheduler. Use it for defined triggers such as a time, startup, sign-in, or event.
卡片 301
问题
What must be assigned before a user can legally use many cloud productivity apps?
答案
The correct service license. Installation alone does not grant an account access to licensed features.
卡片 302
问题
What do
/Applications,/Users,/Library, and/Systemhold on macOS?答案
They hold installed apps, user home folders, shared support data, and protected system components, respectively. A user's own Library sits inside that user's home folder.
卡片 303
问题
What path format directly identifies a Windows network share?
答案
A UNC path such as
\\server\share. A mapped drive gives that share a drive letter for convenience.卡片 304
问题
Why can a 32-bit-only dependency block an otherwise capable 64-bit system?
答案
The application may rely on an unsupported 32-bit component or driver. Confirm the complete dependency chain, not just the CPU architecture.
卡片 305
问题
Which file systems are common on Linux desktops and servers?
答案
ext4 and XFS. Both are Linux-native choices; support for features and repair tools depends on the distribution and workload.
卡片 306
问题
What workload is Windows Pro for Workstations aimed at?
答案
High-end professional hardware and demanding workloads. It adds support intended for workstation-class processors, memory, and storage features.
卡片 307
问题
Why synchronize identity between an organization and a cloud productivity service?
答案
It keeps user accounts and access aligned with the organization's identity source. Provisioning and removal can then follow the user's lifecycle.
卡片 308
问题
When should you try a repair installation or recovery environment?
答案
Use it when the current OS is damaged but preserving the installation is still reasonable. Back up recoverable data before making larger changes.
卡片 309
问题
Which Windows command traces the router hops toward a destination?
答案
tracert. Usepathpingwhen you also need sampled latency and loss information across the route.卡片 310
问题
Why should mobile apps come from the platform's trusted store or an approved enterprise source?
答案
Trusted sources provide stronger publisher, signing, and review checks. Sideloading from an unknown source raises the risk of a malicious or altered app.
卡片 311
问题
What is distinctive about a Windows N edition?
答案
It omits certain built-in media technologies. An application that depends on those components may need Microsoft's media feature package.
卡片 312
问题
Which partition style is the normal choice for a modern UEFI system?
答案
GPT. It supports modern UEFI booting, large disks, and more partitions than legacy MBR.
卡片 313
问题
What should you confirm when setting up a cloud storage sync folder?
答案
Confirm the account, selected folders, local disk impact, sharing rules, and whether files remain available offline.
卡片 314
问题
When does a dedicated GPU matter more than integrated graphics?
答案
It matters when the application requires more graphics performance or dedicated VRAM than the integrated GPU can provide.
卡片 315
问题
How do
chmodandchowndiffer on Linux?答案
chmodchanges permission bits;chownchanges file ownership. Verify the target and use elevated rights only when required.卡片 316
问题
Which command checks a Windows volume's file-system structure for errors?
答案
chkdsk. Review its options before requesting repairs because a repair may need exclusive access or a restart.卡片 317
问题
What is the difference between partitioning and formatting a drive?
答案
Partitioning defines logical regions on the drive; formatting creates a file system inside a partition. Both can affect existing data, so confirm the target first.
卡片 318
问题
What does a client VPN connection provide?
答案
It creates an encrypted path to a remote private network. The user still needs valid authentication and authorization for its resources.
卡片 319
问题
Which Linux package managers are common on Debian-based and Fedora-based systems?
答案
aptis common on Debian and Ubuntu;dnfis common on Fedora and related systems. Use authorizedsudoelevation for administrative package changes instead of routine root login.卡片 320
问题
When should you use Performance Monitor instead of only Task Manager?
答案
Use Performance Monitor when you need counters collected over time. Task Manager is better for a quick live snapshot.
卡片 321
问题
Which Windows command-line tool manages disks, partitions, and volumes?
答案
diskpart. Select and verify the exact disk before any destructive command.卡片 322
问题
Which firmware and security components are central to Windows 11 hardware eligibility?
答案
UEFI with Secure Boot capability and a supported TPM 2.0 are central requirements. The processor, RAM, and storage must also meet Microsoft's current requirements.
卡片 323
问题
What should you verify before a mobile OS upgrade?
答案
Check device support, free storage, battery or power, network access, app compatibility, and a current backup.
卡片 324
问题
Why mark a Windows connection as metered?
答案
It tells Windows to limit some background transfers on a connection with a data cap or high cost. Updates and cloud sync may behave differently.
卡片 325
问题
Which file system is designed for current Apple storage devices?
答案
APFS. It is Apple's modern file system for macOS and other Apple platforms.
卡片 326
问题
Which Linux commands distinguish free filesystem space from a directory's space use?
答案
dfreports filesystem free space;duestimates space used by files and directories. Use both when tracking down a full disk.卡片 327
问题
What belongs in an OS upgrade preflight check?
答案
Back up user data and settings, then verify hardware, applications, drivers, storage, licensing, and the supported upgrade path.
卡片 328
问题
Why should Windows show known file extensions during support work?
答案
Visible extensions make file types easier to verify and help expose misleading names such as
invoice.pdf.exe.卡片 329
问题
What is the safest source for an application installer?
答案
Use the vendor's trusted store or official download channel. Verify the publisher, signature, or published hash when available.
卡片 330
问题
Which Windows command is built for reliable folder copying with restart and mirror options?
答案
robocopy. Treat mirror or purge options carefully because they can delete destination files that are absent from the source.卡片 331
问题
Why should you verify the supported Windows edition upgrade path before starting?
答案
Not every source edition can upgrade directly to every target edition. An unsupported path may require a clean install instead.
卡片 332
问题
Which Windows tool helps isolate startup problems by controlling boot and service options?
答案
System Configuration (
msconfig). Use selective startup for diagnosis, then restore the intended configuration after testing.卡片 333
问题
What should a technician test before rolling out cloud videoconferencing?
答案
Test supported devices, camera and microphone permissions, network capacity, sign-in, and any organization policy.
卡片 334
问题
What does an operating system reaching end of life mean for support?
答案
The vendor no longer provides normal support or security updates. Plan a supported upgrade or replacement instead of treating the old system as safe indefinitely.
卡片 335
问题
Which Windows command checks protected system files and replaces damaged copies?
答案
sfc /scannow. Run it from an elevated terminal and review the result before deciding the next repair step.卡片 336
问题
What is the purpose of a Microsoft Management Console snap-in?
答案
It adds a focused administrative tool to an MMC console. Event Viewer, Local Users and Groups, and Certificate Manager are common examples.
卡片 337
问题
What is the purpose of a mobile configuration profile?
答案
It applies managed settings such as accounts, certificates, restrictions, and security rules. Install profiles only from an authorized administrator or trusted provider.
卡片 338
问题
What is ReFS mainly designed to improve on supported Windows systems?
答案
Storage resilience and data integrity. ReFS is useful for supported data workloads, but it is not a universal replacement for an NTFS Windows boot volume.
卡片 339
问题
Why pilot a business application before a broad rollout?
答案
A pilot exposes device, network, workflow, licensing, and compatibility effects on a small group before they reach everyone.
卡片 340
问题
Why check sharing permissions before moving a document into a collaboration workspace?
答案
The move may change who can read or edit it. Confirm the intended audience, link settings, ownership, and version history.
卡片 341
问题
Which physical control stops a vehicle from driving close to a protected entrance?
答案
Bollards. They create a physical barrier while still allowing pedestrian access.
卡片 342
问题
What is the main sign that a message may be phishing?
答案
It tries to push you into revealing data, opening a file, or following a link under false pretenses. Verify the request through a known channel.
卡片 343
问题
What protects workstation data if a powered-off drive is stolen?
答案
Data-at-rest encryption, such as BitLocker or FileVault. Store recovery keys through an approved process.
卡片 344
问题
What is the first step in a suspected malware case?
答案
Investigate and verify the symptoms. Record what happened and rule out ordinary faults before declaring the system infected.
卡片 345
问题
What is the purpose of an access control vestibule?
答案
It allows one controlled door to close before the next opens. This reduces tailgating into a secure area.
卡片 346
问题
How do spear phishing and whaling differ from broad phishing?
答案
Spear phishing targets a specific person or group; whaling targets senior or high-value people. Both use tailored context to appear credible.
卡片 347
问题
Which password properties matter most for normal user accounts?
答案
Use long, unique passwords and store them in an approved password manager. Complexity and expiration rules should follow current organization policy.
卡片 348
问题
Why is a normal format not enough before transferring a drive with sensitive data?
答案
A standard format mainly rebuilds file-system structures and may leave recoverable data. Use an approved wipe, secure erase, encryption-key destruction, or physical destruction method.
卡片 349
问题
What makes a Trojan different from a computer virus?
答案
A Trojan pretends to be legitimate so the user installs or runs it. A virus attaches its code to a host file or boot area and replicates when that code runs.
卡片 350
问题
Why combine a badge reader with a biometric check at a sensitive door?
答案
The combination verifies something the person has and something they are. It is stronger than either factor alone.
卡片 351
问题
What does a BIOS or UEFI password protect?
答案
It limits unauthorized firmware changes or startup access. It does not encrypt files on the drive.
卡片 352
问题
Which phishing names apply to voice calls, text messages, and malicious QR codes?
答案
Vishing uses voice, smishing uses SMS or messaging, and QR phishing uses a code to hide the destination. Verify the request before acting.
卡片 353
问题
What should you do once a malware infection is reasonably confirmed?
答案
Quarantine the device from networks and shared storage. Preserve any evidence required by policy while limiting further spread.
卡片 354
问题
Which malware hides deeply in a system to preserve privileged access?
答案
A rootkit. Because it can conceal processes or changes, trusted offline scanning or reimaging may be required.
卡片 355
问题
What simple action protects an unattended signed-in workstation?
答案
Lock the screen. Use an automatic timeout as a backup, and log off when the session is no longer needed.
卡片 356
问题
What do cameras, guards, alarms, lighting, and motion sensors contribute to physical security?
答案
They deter, detect, record, or respond to unauthorized activity. They work best as layers rather than a single control.
卡片 357
问题
What attack occurs when someone watches a user enter sensitive information?
答案
Shoulder surfing. Privacy screens, careful positioning, and awareness reduce the risk.
卡片 358
问题
How should you verify a browser download before running it?
答案
Use a trusted source, confirm the publisher or signature, and compare a published hash when available. A matching hash proves integrity, not that the publisher is trustworthy.
卡片 359
问题
What does a computer virus need in order to spread?
答案
A virus attaches to a host file or boot area and spreads when that infected code runs. A boot-sector virus targets startup data.
卡片 360
问题
When is a secure erase preferable to physical destruction?
答案
Use a verified secure erase when the storage device will be reused and the method fits its media type. Validate the result before reassignment.
卡片 361
问题
How does tailgating differ from impersonation?
答案
Tailgating follows an authorized person into a restricted area; impersonation claims a false identity to gain trust or access.
卡片 362
问题
What does the principle of least privilege require?
答案
Give an account only the access needed for its current job, for only as long as needed. Review and remove unnecessary rights.
卡片 363
问题
What does spoofing change to make a message, host, or caller look trusted?
答案
It forges identifying information such as an address, name, number, or source. Verify identity through a separate trusted signal.
卡片 364
问题
Which Wi-Fi security protocol is the preferred modern choice when all devices support it?
答案
WPA3. Use its strongest supported mode and a strong credential or enterprise authentication.
卡片 365
问题
How does a DDoS attack differ from a DoS attack?
答案
A DDoS attack uses many distributed sources; a DoS attack may come from one source. Both aim to exhaust availability.
卡片 366
问题
What assumption drives a Zero Trust access decision?
答案
No user, device, or network location is trusted automatically. Verify identity, device state, context, and authorization for each access decision.
卡片 367
问题
Which physical methods make a hard drive unusable?
答案
Approved shredding or drilling can destroy the platters and mechanism. Follow safety, environmental, and evidence-handling rules.
卡片 368
问题
How do account lockout and account expiration solve different problems?
答案
Lockout slows repeated failed sign-ins; expiration ends access after a defined date. Set both according to business policy.
卡片 369
问题
Which malware categories secretly monitor a user's activity?
答案
Spyware collects activity or data; a keylogger records input; stalkerware is used for covert surveillance of a person.
卡片 370
问题
What wireless threat presents a convincing fake access point?
答案
An evil twin. Users may connect to it because its network name resembles a trusted one.
卡片 371
问题
What are the first security changes on a new SOHO router?
答案
Change default administrator credentials, update firmware, and save a known-good configuration. Use a unique management password.
卡片 372
问题
What should you do when a browser reports an invalid certificate on a sensitive site?
答案
Stop and verify the address, system time, and certificate details. Do not bypass the warning for sign-in or payment data.
卡片 373
问题
What does an access control list decide?
答案
An ACL states which identities or traffic are allowed or denied on a resource. Keep entries specific and review inherited rules.
卡片 374
问题
Which malware blocks access to data and demands payment?
答案
Ransomware. Isolate the device quickly and recover from known-good backups rather than assuming payment will restore data.
卡片 375
问题
How should router management access be exposed?
答案
Allow it only from trusted interfaces and secure protocols, ideally from the local network. Place the router where unauthorized people cannot reset or replace it.
卡片 376
问题
How should Windows restore points be handled during an approved malware-removal workflow?
答案
Temporarily disable System Restore when the procedure calls for it, then re-enable it and create a clean restore point after remediation.
卡片 377
问题
Which built-in accounts or credentials should be changed or disabled during setup?
答案
Disable the guest account when unused and replace default administrator names or passwords where policy requires it. Never leave vendor defaults active.
卡片 378
问题
What happens in an on-path attack?
答案
The attacker positions themselves between communicating parties to observe or alter traffic. Strong certificate validation and encryption help prevent it.
卡片 379
问题
How do browser patches and extension controls work together?
答案
Patches fix browser flaws; extension controls reduce code from untrusted add-ons. Keep only approved, necessary extensions.
卡片 380
问题
How should a guest wireless network be separated from trusted devices?
答案
Use a separate guest network with strong encryption and client isolation. Do not grant it access to internal files or management interfaces.
卡片 381
问题
Why disable AutoRun and unused services?
答案
They remove automatic execution paths and unnecessary attack surface. Confirm a service is not required before disabling it.
卡片 382
问题
Which storage media can degaussing sanitize?
答案
Magnetic media such as compatible hard drives and tapes, but only with an approved degausser rated for that exact medium. Flash storage such as SSDs cannot be sanitized this way. A drive becoming unusable does not prove its data was sanitized; follow and validate the approved procedure.
卡片 383
问题
Why update anti-malware tools before the main removal scan?
答案
Current definitions and engines can recognize newer threats. Scan in a safer environment, such as Safe Mode or approved recovery media, when appropriate.
卡片 384
问题
What makes authentication multifactor?
答案
It uses factors from at least two different categories, such as a password plus a hardware token or biometric. Two passwords are still one factor type.
卡片 385
问题
Which encryption choice is appropriate for a WPA2 network?
答案
AES-based CCMP. Avoid selecting older TKIP just to keep obsolete clients connected.
卡片 386
问题
What is the basic endpoint patching sequence?
答案
Inventory supported systems, deploy tested OS and application updates, verify success, and remediate failures. Endpoint security definitions need updates too.
卡片 387
问题
Why should daily work use a standard account instead of an administrator account?
答案
A standard account limits what mistakes or malware can change. Elevate only the specific approved task through UAC or Run as administrator.
卡片 388
问题
When is reimaging safer than continuing to clean an infected PC?
答案
Reimage when trust cannot be restored, the malware is deeply embedded, or policy requires a known-good build. Restore only verified clean data.
卡片 389
问题
Why is TKIP a poor choice for a new wireless network?
答案
TKIP is a legacy protocol with known security limits. Replace incompatible clients and use WPA2-AES or WPA3.
卡片 390
问题
When is incineration an acceptable data-destruction method?
答案
Only through an authorized facility that can handle the material safely and meet legal and environmental requirements.
卡片 391
问题
What does private browsing protect on a shared computer?
答案
It reduces local history and cookie retention after the session. It does not hide activity from the network or service, so sign out and clear sensitive data as policy requires.
卡片 392
问题
How does a dictionary attack differ from a general brute-force attack?
答案
A dictionary attack tries likely words and known password patterns; brute force systematically tries possibilities. Long, unique passwords and rate limits make both harder.
卡片 393
问题
How do SSO and SAML commonly work together?
答案
SSO lets one sign-in reach multiple services; SAML can carry trusted authentication claims between an identity provider and a service.
卡片 394
问题
Why disable UPnP and unused inbound ports when they are not required?
答案
They can create unnecessary paths into the network. Open only the specific service and source access the business needs.
卡片 395
问题
What symptom often points to an unauthorized cryptominer?
答案
Unexplained sustained CPU or GPU use, heat, fan noise, or power consumption. Confirm the process before removal.
卡片 396
问题
What should an outsourced destruction vendor provide?
答案
A traceable certificate of destruction or recycling tied to the assets. Confirm the vendor and chain of custody before release.
卡片 397
问题
When is just-in-time privileged access safer than a standing admin account?
答案
It grants elevated rights only for an approved task and limited time. Privileged access management can control and record that elevation.
卡片 398
问题
What follow-up checks belong after malware removal?
答案
Run updated scans, patch the system, schedule ongoing scans and updates, and verify normal behavior before reconnecting fully.
卡片 399
问题
Which input flaws commonly enable SQL injection and cross-site scripting?
答案
SQL injection reaches a database through unsafe query input; XSS injects script into content a browser renders. Use parameterized queries for SQL and context-aware output encoding for browser content.
卡片 400
问题
Which mobile controls help after a managed phone is lost?
答案
A locator, remote lock or wipe, device encryption, and a current remote backup. Test enrollment before the device disappears.
卡片 401
问题
Which control is designed to detect or block sensitive data from leaving approved boundaries?
答案
Data loss prevention, or DLP. It applies rules to data in use, in motion, or at rest according to policy.
卡片 402
问题
When is port forwarding appropriate on a small network?
答案
Use it only for an approved service that must receive inbound traffic. Prefer a screened subnet or other isolation for exposed systems, and document the narrow rule.
卡片 403
问题
Why can fileless malware be hard to detect?
答案
It relies heavily on memory and legitimate system tools instead of leaving a normal executable on disk. Behavior monitoring is especially useful.
卡片 404
问题
Why are unpatched, end-of-life, or unmanaged BYOD systems a security risk?
答案
They may lack current fixes, controls, or visibility. Enforce support and access policy instead of assuming a connected device is safe.
卡片 405
问题
What must guide disposal of batteries, storage devices, and electronics?
答案
Applicable data-retention, privacy, environmental, and recycling rules. Record asset disposition according to policy.
卡片 406
问题
What should an email security gateway do before a message reaches the user?
答案
Filter suspicious senders, links, attachments, and spoofing signals. Users should still verify unusual requests through a known channel.
卡片 407
问题
Which service commonly provides centralized authentication for enterprise Wi-Fi?
答案
RADIUS. It validates users or devices against a central identity source; TACACS+ is more commonly associated with network-device administration.
卡片 408
问题
How does MDM reduce risk on BYOD and corporate-owned mobile devices?
答案
MDM applies profiles, screen-lock rules, updates, app controls, and remote actions. The policy should clearly separate company requirements from personal privacy.
卡片 409
问题
How does a potentially unwanted program differ from clearly malicious malware?
答案
A PUP may be installed with nominal consent but still adds unwanted behavior, such as aggressive ads or browser changes. Remove it through approved tools and review bundled installers.
卡片 410
问题
What should the technician explain to the user after a malware incident?
答案
Explain the likely entry point and practical prevention steps, such as safer links, trusted downloads, updates, and prompt reporting.
卡片 411
问题
What is the first useful action after a Windows blue-screen crash?
答案
Record the stop code and recent changes, then check relevant logs and dumps. Do not replace hardware from the blue screen alone.
卡片 412
问题
What should you try first when one mobile app will not launch?
答案
Force-close the app, reopen it, and check for an update. If the problem persists, restart the device and verify the app still supports the OS.
卡片 413
问题
What should you do after finding an unapproved app already installed on a managed phone?
答案
Document it and follow policy to block or remove it through the approved mobile-management process. Do not open it for testing; if compromise is plausible, contain the phone and escalate before wiping evidence.
卡片 414
问题
What should you do if a possibly infected PC suddenly cannot reach the network?
答案
Check ordinary link and IP status, but keep the PC isolated if compromise is plausible. Do not weaken the firewall just to restore access.
卡片 415
问题
Where should you start when Windows feels broadly slow?
答案
Check Task Manager for CPU, memory, disk, and startup pressure. Correlate the bottleneck with recent apps, updates, storage, and temperature.
卡片 416
问题
How should you handle a mobile app that repeatedly crashes while in use?
答案
Reproduce the trigger, free needed resources, update the app and OS, and clear supported app cache or reinstall after protecting its data.
卡片 417
问题
Why should developer mode be disabled on a normal user's mobile device?
答案
It can expose debugging, installation, or control paths that normal operation does not need. Enable it only for an authorized task and turn it off afterward.
卡片 418
问题
What do unfamiliar security alerts on the Windows desktop require?
答案
Verify which installed product or process created them. Capture the message and avoid clicking it until its source is trusted.
卡片 419
问题
What should you try when Windows reaches recovery but not the normal desktop?
答案
Use Startup Repair or Safe Mode to isolate the boot problem. Back up accessible data before risky repair steps.
卡片 420
问题
What commonly blocks a mobile app update?
答案
Low storage, poor connectivity, account or store issues, device policy, or OS incompatibility. Read the exact store error before changing settings.
卡片 421
问题
What security boundary changes when a phone is rooted or jailbroken?
答案
Platform protections and app isolation may be bypassed. Treat the device as noncompliant and restore it through an approved process.
卡片 422
问题
How can you recognize a fake antivirus warning?
答案
It often uses urgent claims, an unfamiliar brand, or a demand to click, call, or pay. Open the approved security tool directly instead of using the alert.
卡片 423
问题
What does a firmware message saying no operating system was found suggest checking first?
答案
Check whether the system drive is detected and first in the intended boot order. Then inspect its connection, partition, and boot data.
卡片 424
问题
What should you verify when a mobile app will not install?
答案
Verify the source, device and OS compatibility, free storage, account licensing, and management policy.
卡片 425
问题
What clues suggest a mobile app is spoofing a legitimate one?
答案
A mismatched publisher, unusual icon or name, excessive permissions, unexpected sign-in, or an unofficial source. Verify the real listing before entering credentials.
卡片 426
问题
What can unexplained renamed or missing personal files indicate?
答案
Malware, ransomware, account misuse, sync trouble, or storage failure are possible. Isolate the scope and preserve evidence before recovery attempts.
卡片 427
问题
What evidence helps separate thermal shutdowns from power failures?
答案
Review temperatures, fan operation, vents, power events, and whether the failure follows load. Test one likely cause at a time.
卡片 428
问题
Where should you start with a generally slow phone or tablet?
答案
Check free storage, active downloads, background apps, battery condition, and pending updates. Restart before considering a reset.
卡片 429
问题
What should unexplained high mobile network traffic make you inspect?
答案
Inspect per-app data use, recent installations, cloud sync, hotspots, and management alerts. Isolate the device if malicious traffic is plausible.
卡片 430
问题
What does sudden inability to open many files suggest checking?
答案
Check extensions, ransom notes, permissions, storage health, and backup status. Widespread encryption may indicate ransomware.
卡片 431
问题
What should you inspect when a Windows service will not start?
答案
Check its startup type, dependencies, logon account, permissions, and Event Viewer message. Fix the recorded cause rather than repeatedly forcing a start.
卡片 432
问题
A mobile OS update downloads but fails verification or installation. What should you try before resetting the device?
答案
Record the exact error and check free storage first. Then use the OS vendor's supported controls to remove the incomplete update and download a fresh copy with reliable power and a stable network connection; use recovery only if the normal updater still fails.
卡片 433
问题
How can security trouble cause degraded mobile response time?
答案
A malicious or unwanted app may consume CPU, storage, or network resources. Compare resource use with recent apps before removing anything.
卡片 434
问题
Where should you investigate unwanted Windows notifications?
答案
Check notification settings, browser site permissions, startup apps, and recently installed software. Remove the source rather than only muting the symptom.
卡片 435
问题
How should you isolate an application that keeps crashing?
答案
Confirm the scope, reproduce it, check logs, update the app, and test its plug-ins or profile. Reinstall only after preserving needed settings and data.
卡片 436
问题
How do you find the likely cause of sudden mobile battery drain?
答案
Review battery usage by app and system feature, then compare with recent updates, signal conditions, screen use, and battery health.
卡片 437
问题
What should you check after an unexpected mobile data-limit notification?
答案
Review per-app usage and the billing period, then inspect background sync, hotspot use, updates, and unknown apps.
卡片 438
问题
Why can repeated OS update failures be a security clue?
答案
Malware may block updates, though storage, network, or service faults are also common. Investigate the exact error and other symptoms before deciding.
卡片 439
问题
What should a low-memory warning lead you to inspect?
答案
Inspect memory pressure, runaway processes, page-file health, and workload requirements. Closing one app may help briefly but does not explain repeated warnings.
卡片 440
问题
What is a useful first isolation step for random mobile reboots?
答案
Remove or disable the most recent app or configuration change, update the OS, and check storage and temperature. Back up before a reset.
卡片 441
问题
What security setting can cause limited mobile internet access even with a good signal?
答案
A bad VPN, proxy, DNS, content-filtering, or management profile can restrict traffic. Compare the configuration with approved policy.
卡片 442
问题
What is a useful first check for random browser pop-ups?
答案
Inspect site-notification permissions, extensions, startup pages, and recently installed software. Do not click inside the pop-up.
卡片 443
问题
What is a sensible first response to a USB controller resource warning?
答案
Disconnect nonessential USB devices, remove unpowered hubs, and check Device Manager. Then update the controller or chipset driver if the evidence supports it.
卡片 444
问题
What is the normal first fix for a Bluetooth pairing problem?
答案
Confirm both devices are discoverable and compatible, then forget the old pairing and pair again. Check distance, battery, and interference.
卡片 445
问题
What should you do if normal connectivity checks pass but a phone still has no internet after a suspicious app install?
答案
Isolate the phone, remove or quarantine the suspicious app through the approved process, and inspect VPN, proxy, DNS, and profile changes.
卡片 446
问题
When does a browser certificate warning point to more than a bad website?
答案
Warnings across several known-good sites can indicate wrong system time, interception, a proxy, or a trust-store problem. Compare on a trusted network and device.
卡片 447
问题
What should you do when instability begins right after a driver update?
答案
Roll back or replace that driver with a known-good supported version. Confirm stability before changing another component.
卡片 448
问题
What should you check when one phone cannot join a known Wi-Fi network?
答案
Confirm the network and password, toggle Wi-Fi, forget and rejoin the network, then compare with another device before resetting network settings.
卡片 449
问题
What commonly causes a sudden flood of ads across a mobile device?
答案
Adware or a PUP is likely, especially after a recent install. Identify the responsible app instead of tapping the ads.
卡片 450
问题
What settings should you inspect when browser searches redirect unexpectedly?
答案
Inspect the default search provider, home page, extensions, proxy, DNS, and hosts file. Record unauthorized changes before correcting them.
卡片 451
问题
How can you test whether a slow Windows sign-in is tied to one user profile?
答案
Sign in with a known-good local profile and compare. Then inspect profile corruption, startup items, scripts, and redirected resources.
卡片 452
问题
What should you check when NFC works only intermittently?
答案
Confirm NFC is enabled, unlock the device if required, align the NFC areas closely, and remove a case that may block the signal.
卡片 453
问题
How should you respond to a mobile pop-up claiming the device is infected?
答案
Treat it as a likely fake security warning. Do not tap its button; close the source, inspect recent apps or browser data, and scan with approved tools.
卡片 454
问题
What should you compare when mobile data fails but Wi-Fi works?
答案
Check airplane mode, cellular enablement, signal, data limits, SIM or eSIM state, carrier settings, and any provider outage.
卡片 455
问题
What is the priority when personal files appear to have leaked from a mobile device?
答案
Contain the device and affected accounts, preserve relevant evidence, and follow the incident process. Revoke exposed sessions or credentials from a trusted device.
卡片 456
问题
Why might a mobile screen refuse to rotate?
答案
Rotation lock may be enabled, the app may not support that orientation, or a motion sensor may be stuck. Check the setting before hardware diagnosis.
卡片 457
问题
What can unexpected mobile actions, permission prompts, or settings changes indicate?
答案
An unauthorized or compromised app may be acting on the device. Review recent installs, permissions, profiles, and account activity.
卡片 458
问题
What makes a browser extension suspicious?
答案
An unknown publisher, broad permissions, forced installation, hidden controls, or behavior unrelated to its stated job. Remove it through policy and inspect related changes.
卡片 459
问题
What should you verify when a Windows update repeatedly fails?
答案
Check free space, restart state, network access, update history, and the specific error. Apply the vendor's targeted repair steps for that code.
卡片 460
问题
When should you reset a mobile device during troubleshooting?
答案
Reset only after narrower fixes fail and a current backup exists. Confirm account credentials and management enrollment needed for recovery.
卡片 461
问题
What causes system time to drift repeatedly after shutdown?
答案
A failing CMOS battery is one possibility; a bad time source or synchronization setting is another. Check when the drift occurs before replacing anything.
卡片 462
问题
What PC settings can malware alter to reroute traffic?
答案
Proxy, DNS, browser, and hosts-file settings are common targets. Compare them with the approved network configuration.
卡片 463
问题
How can a clean boot help with a Windows startup problem?
答案
It starts Windows with a reduced set of nonessential services and startup items. Re-enable items in groups to identify the conflict.
卡片 464
问题
How should you troubleshoot a browser that has become much slower than the rest of the PC?
答案
Test without unneeded extensions, clear only appropriate cache data, check browser tasks, and compare a clean profile. Scan if the behavior is suspicious.
卡片 465
问题
What is the safest next step when several mobile security symptoms appear together?
答案
Disconnect or contain the device, document the symptoms, and escalate through the approved security process. Avoid wiping evidence unless the response plan authorizes it.
卡片 466
问题
Which details belong at the start of a support ticket?
答案
Record the user, device, contact method, affected service, and a clear issue description. Add the time and business impact when relevant.
卡片 467
问题
When is
sfc /scannowa useful Windows repair step?答案
Use it when protected system files may be damaged. Run it elevated and follow the result instead of assuming it fixes every boot or application fault.
卡片 468
问题
What should you do before running a repair that may change a failing Windows disk?
答案
Protect recoverable data first, then check drive health and file-system evidence. A repair tool is not a substitute for replacing failing storage.
卡片 469
问题
What is the right overall response to convincing PC security symptoms?
答案
Contain the system, document evidence, follow the malware or incident procedure, and restore trust with approved tools or a known-good image.
卡片 470
问题
What does a full backup contain?
答案
A full backup copies all selected data in that backup set. It is simple to restore but usually takes the most time and space to create.
卡片 471
问题
Where should a technician look for handling and disposal guidance for a chemical product?
答案
Use its current Safety Data Sheet and local policy. Follow the listed protective, spill, storage, and disposal instructions.
卡片 472
问题
What should a change request state before technical planning begins?
答案
State the purpose, scope, change type, affected systems, owner, and desired date. A clear request makes impact and approval review possible.
卡片 473
问题
What does active listening look like in a support conversation?
答案
Let the customer finish, ask focused questions, and restate the problem to confirm understanding. Avoid interrupting or jumping to a diagnosis.
卡片 474
问题
What does chain of custody record during an incident?
答案
It records who collected, handled, transferred, stored, and accessed evidence, with dates and purpose. This supports integrity and accountability.
卡片 475
问题
What makes a ticket issue description useful to another technician?
答案
It states expected and actual behavior, exact symptoms, scope, timing, and reproducible steps without guesses presented as facts.
卡片 476
问题
What does an incremental backup copy?
答案
It copies data changed since the most recent backup of any type. Backup runs are small, but recovery may need the last full plus every later incremental.
卡片 477
问题
How should a technician respond to an angry customer?
答案
Stay calm, acknowledge the impact, clarify the facts, and explain realistic next steps. Do not argue, blame, or dismiss the concern.
卡片 478
问题
Why does order of volatility matter when collecting incident evidence?
答案
More temporary data can disappear first. Follow the response plan to capture volatile information before less volatile storage when authorized.
卡片 479
问题
Which script type is native to traditional Windows batch command processing?
答案
A
.batfile. VBScript uses.vbsfor older Windows automation; review either script before running it with elevated rights.卡片 480
问题
How do ventilation and dust control affect equipment reliability?
答案
Clear airflow removes heat; controlled dust cleanup prevents blocked vents and conductive buildup. Use equipment-safe compressed air or vacuums.
卡片 481
问题
How should severity and escalation be recorded?
答案
Tie severity to impact and urgency, then use the defined escalation level. Do not inflate it just to move the ticket faster.
卡片 482
问题
Why create a forensic copy instead of investigating the original drive directly?
答案
A verified copy preserves the original evidence and lets analysis proceed with less risk of alteration. Follow authorization and incident policy.
卡片 483
问题
When is RDP a suitable remote-access choice?
答案
Use RDP for an authorized Windows desktop session over a protected path. Limit exposed services, require strong authentication, and follow session policy.
卡片 484
问题
How should an ESD strap be used during internal PC work?
答案
Attach it to an approved ground point while working on powered-down equipment. Pair it with an ESD-safe work surface when available.
卡片 485
问题
What protection does a UPS add beyond a surge suppressor?
答案
A UPS provides temporary battery power and usually power conditioning, giving equipment time to ride through a brief outage or shut down safely.
卡片 486
问题
What should progress and resolution notes contain?
答案
Record tests, results, changes, timestamps, and the confirmed outcome. Another technician should be able to continue without repeating work.
卡片 487
问题
Which data categories usually require stricter handling and retention rules?
答案
Payment data, government identifiers, personally identifiable information, and healthcare data. Apply the relevant law, contract, and business policy.
卡片 488
问题
Which support tasks can AI assist without making the final decision?
答案
AI can help summarize tickets, draft user instructions, search approved knowledge, or suggest diagnostic paths. A technician must verify the result.
卡片 489
问题
What is the first electrical-safety step before repairing a PC?
答案
Shut it down and disconnect power. Follow the device's service procedure because some components can retain hazardous energy.
卡片 490
问题
How do SSH and VNC differ for remote support?
答案
SSH provides an encrypted command-line session; VNC shares a graphical desktop and needs its own secure transport and authentication configuration.
卡片 491
问题
How should a technician set expectations for a repair?
答案
Give a realistic timeline, explain options and dependencies, and send status updates when the estimate changes.
卡片 492
问题
Which script type gives Windows administrators structured access to system management?
答案
A PowerShell
.ps1script. Execution policy is not a malware boundary, so verify the source, signature, and contents.卡片 493
问题
What does a differential backup copy?
答案
It copies data changed since the last full backup. Recovery normally needs the last full and the latest differential.
卡片 494
问题
Why do change plans need both a backup plan and a rollback plan?
答案
The backup protects data; the rollback returns the service to its prior state if the change fails. Define triggers and responsible staff before implementation.
卡片 495
问题
How should loose components be handled and stored?
答案
Hold boards by the edges, avoid contacts, and place them in antistatic packaging on an ESD-safe surface.
卡片 496
问题
Why monitor both temperature and humidity in an equipment room?
答案
Excess heat shortens component life; very low humidity raises static risk, while high humidity can cause condensation or corrosion.
卡片 497
问题
What is a synthetic full backup?
答案
It combines a previous full backup with later backup data to create a new full on the backup system. The source does not need to resend every file.
卡片 498
问题
How do an asset tag and a CMDB serve different support needs?
答案
The asset tag identifies the physical item; the CMDB records its configuration and relationships. Keep assignment, warranty, and licensing data current.
卡片 499
问题
What should a technician verify before installing licensed software?
答案
Verify a valid license, permitted user or device scope, and any EULA or DRM limits. Personal, corporate, perpetual, and open-source licenses grant different rights.
卡片 500
问题
Which script type is commonly used for shell automation on Linux and macOS?
答案
A
.shshell script. Its interpreter, permissions, quoting, and environment determine how it runs.卡片 501
问题
How do GFS rotation and the 3-2-1 backup rule differ?
答案
GFS rotates daily, weekly, and monthly backup generations. The 3-2-1 rule keeps three copies on two different media/storage types, with one copy offsite. GFS organizes retention over time; 3-2-1 spreads copies across storage locations and failure modes.
卡片 502
问题
Which personal protective steps matter for lifting or dusty repair work?
答案
Use safe lifting technique and get help for heavy equipment; wear approved eye or breathing protection when the task creates those hazards.
卡片 503
问题
What does a VPN add to a remote-management session?
答案
It creates an encrypted network path to private resources. The remote tool still needs secure configuration, authentication, and least-privilege access.
卡片 504
问题
What policy questions should come before using AI at work?
答案
Check approved tools, allowed data, required disclosure, ownership rules, and whether the task permits AI assistance. Do not assume a public tool is approved.
卡片 505
问题
Why should a technician avoid jargon when speaking with a customer?
答案
Plain language helps the customer understand choices and give informed answers. Use a technical term only when it adds clarity, then explain it.
卡片 506
问题
What is the value of sandbox testing and peer review before a change?
答案
They expose technical mistakes and unexpected impact away from production. Record results and remaining risk.
卡片 507
问题
What are practical entry-level uses for scripts in support work?
答案
Scripts can collect information, remap drives, install approved apps, start updates, restart systems, or run backups consistently. Python
.pyand JavaScript.jsfiles are common choices when the environment supports them.卡片 508
问题
What is the benefit and main risk of an RMM platform?
答案
RMM can monitor and manage many endpoints centrally; compromise or misuse can reach many endpoints too. Protect the console with strong access controls, logging, and updates.
卡片 509
问题
How should a technician handle a confident AI answer?
答案
Verify it against trusted evidence. AI can hallucinate, carry bias, miss context, or present outdated information fluently.
卡片 510
问题
How do surges, brownouts, and blackouts differ?
答案
A surge is excess voltage, a brownout is reduced voltage, and a blackout is a loss of power. Match surge protection and UPS capacity to the equipment.
卡片 511
问题
What must you review before running an unfamiliar support script?
答案
Review its source, inputs, privileges, target systems, resource use, network actions, error handling, and rollback. A script can spread malware or change many systems quickly.
卡片 512
问题
How do an NDA and an acceptable use policy serve different purposes?
答案
An NDA restricts disclosure of protected information; an AUP defines permitted use of systems and data. Follow both along with incident and compliance rules.
卡片 513
问题
When should a normal change wait even if the technical work is ready?
答案
Wait for required approval and an allowed maintenance window. Respect change freezes unless the approved emergency process applies.
卡片 514
问题
Which support document should guide a repeatable task with an agreed method?
答案
Use the relevant SOP or checklist. Consult the SLA for service commitments and the knowledge base for reusable diagnosis or resolution guidance.
卡片 515
问题
What should a technician do if arriving late is unavoidable?
答案
Contact the customer promptly, give an honest revised time, and keep the new commitment. Document service provided and follow up as promised.
卡片 516
问题
What safety problems does good cable management prevent?
答案
It reduces trip hazards, blocked airflow, connector strain, and accidental disconnection. Keep cables clear of heat and emergency access.
卡片 517
问题
How do you know a backup is usable?
答案
Test restores on a defined schedule. Verify data integrity and practice both overwrite recovery and recovery to an alternative location.
卡片 518
问题
What closes a well-managed change?
答案
Verify the implementation, obtain required user acceptance, update documentation, and review the outcome. Trigger rollback if the defined failure criteria occur.
卡片 519
问题
How should a technician handle private material visible on a customer's device?
答案
View only what the task requires, avoid copying or discussing it, and follow privacy policy. Maintain professional appearance and conduct in the customer's environment.
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问题
What data boundary applies when prompting a public AI service?
答案
Never send credentials or secrets to a public AI service. Keep private customer data, regulated data, proprietary code, and incident evidence out as well. An approved enterprise AI service is a separate case: use it only under the organization's data policy and contractual controls, and still never paste credentials or secrets.
