[2025年11月28日]220-1101問題集PDFとテストエンジン 試験問題
検証済みの220-1101テスト問題集と解答で正確な870問題解答あります
質問 # 517
A technician is setting up a projector for a videoconferencing system. When the user attempts to connect a laptop to the system, the system displays the following error message: no source found The user tries multiple cables and inputs on the projector. Which of the following should the user try NEXT?
- A. Check the bulb on the projector and replace it with a new one.
- B. Replace the projector with another known-good one and try again.
- C. Check the display settings on the computer and set them to extend/duplicate.
- D. Replace the video card on the machine that is plugged in to the projector, as it has gone bad.
正解：C
解説：
If no image is displayed on the monitor or projector, first make sure that the display device is plugged in and turned on. Check that the monitor is not in standby mode (press a key or cycle the power to the monitor to activate it).
You may also need to use controls on the monitor itself to adjust the image or select the appropriate data source or input channel. For example, if there is no image on the screen, check that the monitor is set to use the HDMI port that the computer is connected to, rather than an empty DVI port. These o n-screen display (OSD) menus are operated using buttons on the monitor case. As well as input control, you can usually find settings for brightness, color/contrast, and power saving.
質問 # 518
A technician is creating a new RAID array for a customer. After interviewing the customer, the technician decides to implement a RAID array of striping without parity. Which of the following reasons would lead the technician to choose striping without parity instead of striping with parity?
- A. Uptime is the customer's biggest concern.
- B. Available storage space needs to be maximized.
- C. Speed is the most important consideration.
- D. Redundancy and speed are equally important.
正解：C
解説：
Speed is the most important consideration. Striping without parity, also known as RAID 0, is a RAID configuration that splits data across multiple disks without any redundancy. This improves the performance of read and write operations, as multiple disks can work in parallel. However, this also increases the risk of data loss, as any disk failure will result in losing all data on the array.
質問 # 519
A user reports limited or no connectivity on a laptop. A technician runs ipconf ig /all with the following result:
Which of the following is the MOST likely cause of this issue?
- A. Duplicate IP address
- B. ARP cache
- C. DNS resolution
- D. DHCP failure
正解：D
質問 # 520
A technician needs to update a web server's IPv4 address in a DNS server. Which of the following records should the technician update?
- A. AAAA
- B. MX
- C. CNAME
- D. A
正解：D
解説：
A: Used for IPv6. Incorrect.
B: Relates to email servers. Incorrect.
C: Provides aliases, not IP mappings. Incorrect.
D: Maps hostnames to IPv4 addresses. Correct.
Explanation:
Step by Step Detailed Comprehensive Explanation with All CompTIA Reference:
Analysis of the Problem:
IPv4 records are associated with "A" records in DNS servers.
Option Evaluation:
質問 # 521
A remote user called the help desk to report a notification indicating there is limited or no connectivity. The user can access local file folders and other local machines but none of the organization's servers or network items. Web pages do not appear to function either. Which of the following is the MOST likely cause of the issue?
- A. The user's internet connection is down.
- B. The user's switch has stopped working.
- C. The user's domain account is locked out.
- D. The user's IP address needs to be renewed.
正解：A
解説：
Explanation
Based on the information provided in the scenario, the most likely cause of the issue is that the user's internet connection is down (option A). This would explain why the user is unable to access any of the organization's servers or network items and why web pages are not functioning. However, since the user can still access local file folders and other local machines, it suggests that their local network is still functioning.
The user can access local file folders and other local machines but none of the organization's servers or network items, indicating that the issue is with the user's internet connection, not with the user's domain account, switch, or IP address.
When a user receives a notification indicating that there is limited or no connectivity, it means that their device is unable to establish a connection to the network. In this scenario, the user can access local file folders and other local machines but is unable to access any of the organization's servers or network items and web pages are not functioning. This suggests that the issue is with the user's internet connection.
An internet connection allows a device to communicate with other devices and servers outside of its local network. If the internet connection is down or not functioning properly, the device will be unable to access any resources outside of its local network. This would explain why the user in this scenario can still access local resources but is unable to access any of the organization's servers or network items.
質問 # 522
A graphic designer wants to upgrade to the fastest possible RAM for a desktop workstation. Which of the following types of RAM would be best for the designer to use?
- A. DDR3 SDRAM
- B. DDR4 SDRAM
- C. DDR5 SDRAM
- D. DDR2 SDRAM
正解：C
解説：
Explanation
DDR5 SDRAM (Double Data Rate 5 Synchronous Dynamic Random-Access Memory) is the latest and fastest type of RAM for desktop workstations as of 2023. DDR5 SDRAM offers higher speeds, lower power consumption, greater capacity, and improved reliability than previous generations of DDR SDRAM. DDR5 SDRAM can operate at frequencies up to 8400 MHz, compared to 3200 MHz for DDR4 SDRAM, which means it can transfer data faster and more efficiently. DDR5 SDRAM also supports dual-channel memory, which allows two memory modules to work together and double the bandwidth. DDR5 SDRAM is compatible with the latest Intel and AMD processors that support the DDR5 standard.
The other options are not as fast or suitable for a desktop workstation. DDR2 SDRAM, DDR3 SDRAM, and DDR4 SDRAM are older and slower types of RAM that have lower frequencies, higher voltages, and lower capacities than DDR5 SDRAM. DDR2 SDRAM, DDR3 SDRAM, and DDR4 SDRAM are not compatible with the latest processors that support DDR5 SDRAM, and require different motherboards and slots. DDR2 SDRAM, DDR3 SDRAM, and DDR4 SDRAM are more suitable for older or budget systems that do not require high performance or memory-intensive applications.
References:
The best RAM 2023: top memory for your PC1
The best RAM for gaming 2023: Blazing-fast speeds for your PC2
What RAM Speed Do I Need? [2023 Guide] - GamingScan3
Crucial RAM Memory for Desktop Computers4
質問 # 523
A system administrator has been tasked with allowing SMTP traffic through the system's host-based firewall. Which of the following ports should the administrator enabled?
- A. 0
- B. 1
- C. 2
- D. 3
正解：D
質問 # 524
A user wants to overclock a GPU but is concerned about potential overheating. Which of the following would best address the user's concern?
- A. Fan upgrade
- B. Liquid cooling
- C. Thicker thermal pads
- D. Larger heat sink
正解：B
解説：
Liquid cooling is an effective solution for managing the high heat output that can result from overclocking a GPU. It's more efficient than air cooling methods (like larger heat sinks or fan upgrades) and can better maintain lower temperatures under load, reducing the risk of overheating.
質問 # 525
A user dropped a laptop while it was turned on. The hard drive now makes a clicking sound, and the laptop will not start up. Which of the following most likely explains this situation?
- A. The hard drive bracket screws are lose.
- B. The hard drive jumpers need to be reseated.
- C. The SATA cable is lose.
- D. The hard drive is damaged.
正解：D
解説：
A clicking hard drive is usually a sign of a mechanical failure, where the read/write heads are not functioning properly or the platters are scratched or broken. This can be caused by physical shock, such as dropping the laptop while it was turned on. A damaged hard drive may not be able to boot up the operating system or access the data stored on it. This is a serious problem that requires data recovery and hard drive replacement.
質問 # 526
An administrator is using an RJ45 connector to terminate a network cable. Which of the following cables is the administrator terminating?
- A. Cat 6
- B. Optical
- C. Serial
- D. USB
正解：A
解説：
An RJ45 connector is used for terminating twisted-pair network cables, such as those used in Ethernet networking. The correct type of cable being terminated with an RJ45 connector is Cat 6.
Cat 6 is a category of Ethernet cable that uses RJ45 connectors and supports high-speed network connections.
質問 # 527
Ann, a user, reports her wireless headset is no longer working properly with her mobile device after a recent security update. Which of the following should a technician configure FIRST to resolve the issue?
- A. Security settings
- B. Bluetooth settings
- C. WiFi settings
- D. NFC settings
正解：B
質問 # 528
Which of the following wireless technologies has the MOST range and wireless throughput?
- A. 802.11ac
- B. 802.11g
- C. 802.11ax
- D. 802. 11b/gin
正解：C
質問 # 529
A technician needs to configure a firewall to enable network printing. Which of the following network ports should be opened? (Select two).
- A. 23 (Telnet)
- B. 3389 (RDP)
- C. 25 (SMTP)
- D. 515 (LDP)
- E. 631 (IPP)
- F. LPT1
正解：D、E
解説：
For network printing, the required ports are typically those used by printing protocols. Port 515 is used by the Line Printer Daemon (LPD) protocol, and port 631 is used by the Internet Printing Protocol (IPP). These ports need to be opened in the firewall to allow print jobs to be sent to and from network printers.
質問 # 530
Which of the following provides the highest level of isolation from the host operating system?
- A. Type II hypervisor
- B. Single-node clustering
- C. Resource pooling
- D. Hardware-assisted virtualization
正解：D
解説：
Hardware-assisted virtualization, often implemented through technologies like Intel VT-x or AMD- V, allows the hypervisor to directly manage hardware resources, enhancing the isolation between virtual machines (VMs) and the host operating system. With hardware-assisted virtualization, VMs have more direct access to physical hardware resources, reducing the potential for interference or compromise from the host operating system.
質問 # 531
A technician is troubleshooting a PC that has been experiencing random system crashes. The technician has already checked the hard drive and the RAM, and both were in good working order. Which of the following steps should the technician take next to troubleshoot the system crashes?
- A. Test the fan speed.
- B. Replace the PSU
- C. Decrease the RAM timings.
- D. Disable the USB ports
正解：B
解説：
A PSU (power supply unit) is a component that converts the AC power from the wall outlet into DC power that the PC components can use. A faulty or failing PSU can cause random system crashes, as well as other problems such as noise, overheating, or no power at all. A PSU can fail due to various reasons, such as age, dust, power surges, or poor quality.
To troubleshoot a PSU, the technician can use a multimeter to measure the voltage output of the PSU connectors. The voltage should be within the acceptable range of the specifications. For example, the 12V rail should be between 11.4V and 12.6V. If the voltage is too low or too high, the PSU is likely defective and needs to be replaced.
Alternatively, the technician can try swapping the PSU with a known good one and see if the system crashes persist. If the system works fine with a different PSU, then the original PSU is the problem and should be replaced.
The other options are not likely to fix the random system crashes. Testing the fan speed may help to diagnose overheating issues, but it is not related to the PSU. Disabling the USB ports may help to eliminate potential conflicts with USB devices, but it is not related to the PSU. Decreasing the RAM timings may help to improve performance and stability, but it is not related to the PSU.
Reference:
Fix Random PC Crashes: 10 Steps to Identify and Fix Issues
Why Does Windows Crash? The 9 Most Common Reasons
質問 # 532
An end user reports that the time and date on a desktop resets after shutdown, and subsequently, the device reboots. The next day, the desktop does not load the OS and is stuck at a black screen with the following message:
Which of the following would be the BEST action to take next?
- A. Change the motherboard.
- B. Replace the CMOS battery.
- C. Restore the BIOS to factory default settings.
- D. Reseat the motherboard power connections.
正解：B
質問 # 533
Which of the following could a user employ to maximize module bandwidth when selecting memory for a high-end gaming computer?
- A. Physical module size
- B. Error correction
- C. RAM voltage
- D. Channel configuration
正解：D
解説：
Comprehensive and Detailed In-Depth Explanation:
Channel configuration (e.g., dual-channel, quad-channel) determines how memory modules communicate with the memory controller. Using matched pairs in dual- or quad-channel setups can significantly increase memory bandwidth, improving performance - especially for gaming and video-intensive tasks.
* Option A (Error correction): ECC RAM is used in servers for reliability, not performance or gaming.
* Option B (RAM voltage): Affects compatibility and overclocking but not bandwidth.
* Option D (Physical size): Refers to module form factor (e.g., DIMM, SO-DIMM) and does not impact bandwidth.
CompTIA A+ Core 1 Exam Objective Reference:
* Objective 3.2: Given a scenario, install RAM types.
質問 # 534
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