CSLB General Building (B) Trade Practice Test
常见问题
这里有多少道 CompTIA A+ Core 1 练习题?+
一整套原创 CompTIA A+ Core 1 练习题,覆盖官方内容板块、按真实考试权重分布、附解析。免费,无需注册。
CompTIA A+ Core 1 考试是什么样的?+
大约 100 道题。先在这里按主题刷题,再做完整计时模考检验准备度。
这些是真实考题吗?+
不是。每道题都是 100% 原创,依据公开一手来源编写并附解析。我们从不抄袭真题或付费备考资料。
我可以用中文或西班牙语学吗?+
PrepPass 练习提供英文、中文、西班牙文。官方考试以英文进行 —— 你随时可以把题目语言切回英文,熟悉考试当天的确切术语。
样题与解析
以下是本题库中的部分真题与完整解析。完整题库请用上方的刷题工具。
- 1. Hardware
Which memory technology is most commonly used as the main system RAM in a modern desktop computer?
- a.DDR SDRAM DIMMs
- b.NAND flash chips
- c.GDDR video memory
- d.EEPROM
答案: a
解析: Modern desktops use DDR SDRAM installed as DIMM modules for main system memory. NAND flash is used for SSDs, GDDR is dedicated video memory on graphics cards, and EEPROM stores small amounts of firmware data.
- 2. Hardware
How many drives are minimally required to build a RAID 5 array?
- a.Two
- b.Four
- c.Three
- d.One
答案: c
解析: RAID 5 distributes parity across all members and needs a minimum of three drives. It can survive the loss of a single drive by rebuilding from parity information.
- 3. Hardware
Which component temporarily stores data the CPU is actively using and loses its contents when powered off?
- a.System RAM
- b.Hard drive
- c.BIOS ROM
- d.Optical disc
答案: a
解析: System RAM is volatile memory that holds active program data and is cleared when power is removed. Hard drives and optical discs are non-volatile storage, and BIOS ROM retains firmware.
- 4. Networking
A client shows an IP address in the 169.254.x.x range. What does this indicate?
- a.A static public IP
- b.A successful DHCP lease
- c.APIPA — the client failed to reach a DHCP server
- d.An IPv6 link-local address
答案: c
解析: An address in 169.254.0.0/16 is APIPA, which a Windows host self-assigns when no DHCP server responds. It signals a DHCP problem rather than a normal lease.
- 5. Networking
Which connector terminates a twisted-pair Ethernet cable?
- a.RJ45
- b.RJ11
- c.BNC
- d.SC
答案: a
解析: Ethernet twisted-pair cables use 8-position RJ45 connectors. RJ11 is for telephone lines, BNC is coax, and SC is a fiber-optic connector.
- 6. Mobile Devices
Which component in a laptop allows it to connect to wireless networks and is often a replaceable M.2 card?
- a.Northbridge
- b.CMOS battery
- c.Wi-Fi/WLAN card
- d.Optical drive
答案: c
解析: The WLAN (Wi-Fi) card, frequently an M.2 module, provides wireless connectivity and can be serviced or upgraded. The CMOS battery, chipset, and optical drive serve different roles.
- 7. Virtualization & Cloud
In cloud computing, what does IaaS provide?
- a.Virtualized compute, storage, and networking infrastructure
- b.Finished applications only
- c.Only a development platform
- d.Physical office space
答案: a
解析: Infrastructure as a Service delivers virtual machines, storage, and networking that customers manage themselves. SaaS delivers finished apps and PaaS provides a development platform.
- 8. Hardware & Network Troubleshooting
What is the correct first step in the CompTIA troubleshooting methodology?
- a.Implement the fix immediately
- b.Document the outcome
- c.Identify the problem
- d.Reboot everything
答案: c
解析: The methodology begins with identifying the problem by gathering information and questioning the user. Establishing a theory, testing, fixing, and documenting come later in the sequence.
- 9. Hardware & Network Troubleshooting
A system randomly reboots under heavy load. Which cause should be investigated?
- a.Overheating or inadequate/failing power supply
- b.Keyboard layout
- c.Wallpaper resolution
- d.Browser cache
答案: a
解析: Random reboots under load commonly result from overheating (dust, failing fans, dried thermal paste) or a power supply that cannot sustain the load. Cosmetic software settings do not cause reboots.
- 10. Hardware & Network Troubleshooting
A network cable run seems dead. Which tool verifies the wiring is terminated correctly end to end?
- a.Multimeter
- b.Thermal camera
- c.Cable tester
- d.Antistatic strap
答案: c
解析: A cable tester checks pin-by-pin continuity and correct termination of a network cable. A multimeter measures electrical values but not Ethernet pinout mapping directly, and the others are unrelated.