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CompTIA 220-1101 認定試験の出題範囲：
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質問 # 109
A technician is setting up a home network with the following requirements:
Automatic distribution of IP addresses
. Internet access
Which of the following should the technician configure? (Select two).
- A. Public IP addresses
- B. Static IP addresses
- C. VPN
- D. APIPA
- E. Gateway
- F. DHCP
正解：E、F
解説：
DHCP (Dynamic Host Configuration Protocol) is a protocol that allows a device to automatically obtain an IP address and other network settings from a DHCP server, such as a home router. This simplifies the network configuration and avoids IP address conflicts. DHCP is a common requirement for home networks that have multiple devices that need Internet access.
A gateway is a device that connects two different networks, such as a home network and the Internet. A gateway usually performs routing functions, which means it determines the best path for packets to reach their destination. A gateway also often performs NAT (Network Address Translation), which allows multiple devices on a home network to share a single public IP address. A gateway is a necessary requirement for home networks that need Internet access.
References
Understanding DHCP on Home Networks
Basic home gateway services: DHCP, DNS, NAT
IP Addresses on Home Networks - A Beginner's Guide
質問 # 110
A technician is unable to connect to a network device via SSH_ Which of the following cables should the technician use as an alternative connection method with a laptop?
- A. Serial
- B. Lightning
- C. HDMI
- D. Parallel
正解：A
解説：
The correct answer is
A) Serial.
A serial cable is a type of cable that can be used to connect a laptop to a network device via a serial port. A serial port is a physical interface that allows data transmission between devices using serial communication, which is a method of sending data one bit at a time over a single wire. Serial ports are often used for console access to network devices, such as routers, switches, firewalls, or servers, when other methods of connection, such as SSH (Secure Shell), are not available or not working.
SSH is a protocol that allows secure and encrypted remote login and command execution over a network. SSH uses public key cryptography to authenticate the client and the server, and to encrypt the data exchanged between them. SSH can be accessed through different ports, depending on the configuration of the server and the client. The default port for SSH is 22, but it can be changed to any other port for security reasons.
HDMI (High-Definition Multimedia Interface) is a type of cable that can be used to transmit audio and video signals between devices, such as laptops, monitors, TVs, or projectors. HDMI cables support high-definition video and audio formats, and can also carry Ethernet and power signals. HDMI cables are not suitable for connecting to network devices via SSH, as they are designed for multimedia purposes.
Parallel cables are a type of cable that can be used to connect devices that use parallel communication, which is a method of sending data multiple bits at a time over multiple wires. Parallel cables are often used for connecting printers or scanners to computers, but they are not commonly used for network devices or SSH connections.
Lightning cables are a type of cable that can be used to connect Apple devices, such as iPhones, iPads, or iPods, to computers or chargers. Lightning cables support data transfer and power delivery, and can also be used with adapters to connect to other types of ports, such as USB or HDMI. Lightning cables are not compatible with network devices or SSH connections, as they are specific to Apple products.
Therefore, the only cable that can be used as an alternative connection method with a laptop when SSH is not working is a serial cable. Serial cables can provide console access to network devices and allow configuration and troubleshooting commands to be executed. For more information about SSH and its alternatives, you can refer to the following web search results: Alternatives to SSH, How To Configure Custom Connection Options for your SSH Client, Understanding the SSH Encryption and Connection Process, How to Use Public Key Authentication with SSH.
質問 # 111
A user is requesting a headset that can be physically connected to a laptop for online conference calls. Which of the following connections should the headset use?
- A. USB
- B. Bluetooth
- C. Thunderbolt
- D. DVI
正解：A
解説：
A USB (universal serial bus) connection is the most suitable option for a headset that can be physically connected to a laptop for online conference calls. A USB connection is a digital interface that can transfer both power and data between devices using a standard cable. A USB headset can plug into any available USB port on the laptop and communicate with the audio and microphone drivers without requiring additional software or hardware. A USB headset can also offer enhanced features, such as inline controls, noise cancellation, surround sound, or LED lighting, depending on the model and manufacturer.
Other connections, such as Bluetooth, DVI, or Thunderbolt, are not appropriate for a headset that can be physically connected to a laptop. Bluetooth is a wireless technology that uses radio waves to pair devices over a short distance, and it requires a battery or a charger for the headset. DVI (digital visual interface) is a video interface that can transmit digital or analog signals between a display device and a video source, and it is not compatible with audio or microphone devices. Thunderbolt is a high-speed interface that can support multiple protocols, such as DisplayPort, USB, or PCI Express, and it requires a special cable and port that may not be available on all laptops.
Reference:
How to set up and use a headset on Windows 10 | Windows Central1
How to Connect a Headset to a Computer2
USB - Wikipedia
質問 # 112
A small ISP has hired a new technician Joe, the new technician, is being trained to configure customers* home networks The trailing instructor gives me technician a starter kit with cables, cable ends, and other network equipment and asks mm to build a working network.
The computer should be connected to have internet connectivity and the phone should be connected to have a dial tone.
INSTRUCTIONS
Use the appropriate cables. cable ends, tools and equipment to configure the network ana connect an components accordingly There are 3 steps and the simulation starts on step 1.
正解：
解説：
See the answer below in explanation part.
Explanation:
Answer of both steps below.
A picture containing text, screenshot, indoor Description automatically generated
Diagram Description automatically generated with medium confidence
質問 # 113
In a SOHO environment, a user wants to make sensitive, scanned documents available to other users on the domain. The logs need to indicate who accessed the documents and at what time they were accessed. Which of the following settings should a technician set up on the MFP device?
- A. Scan to email
- B. PCL
- C. SMB share
- D. ADF tray
正解：C
解説：
The correct answer is D. SMB share.
SMB stands for Server Message Block, which is a network protocol that allows file and printer sharing among different devices on a local area network (LAN). An SMB share is a folder or drive that is shared using the SMB protocol and can be accessed by authorized users on the network. An MFP device is a multifunction printer that can perform multiple tasks, such as printing, scanning, copying, and faxing.
In a SOHO (small office/home office) environment, a user who wants to make sensitive, scanned documents available to other users on the domain can set up an SMB share on the MFP device. This way, the user can scan the documents to the SMB share and grant access permissions to the other users who need to view or edit them. The SMB share can also enable logging, which can record who accessed the documents and at what time they were accessed .
The other options are not the best settings for this scenario. Scan to email is a feature that allows the user to scan a document and send it as an email attachment to a recipient. This option may not be secure or convenient for sharing sensitive documents with multiple users on the domain. ADF tray stands for automatic document feeder tray, which is a component of an MFP device that can feed multiple pages of a document into the scanner or copier without manual intervention. This option is not related to sharing or logging scanned documents. PCL stands for Printer Command Language, which is a page description language that controls the layout and printing of documents. This option is not related to sharing or logging scanned documents either.
質問 # 114
A user's brand new phone froze while information was being transferred from the old phone. When a technician reset the new phone, it functioned properly when a data transfer was not being attempted. When the technician tested the old phone, it did not appear to have any functionality issues and passed all forms of device testing. Which of the following is the most likely reason the data transfer failed?
- A. The older phone had different hardware.
- B. The older phone had a corrupted OS.
- C. The older phone utilized different wireless protocols.
- D. The older phone had a different OS version.
正解：C
解説：
The most likely reason the data transfer failed is D. The older phone utilized different wireless protocols.
Wireless protocols are the standards that devices use to communicate with each other over a wireless network. Different wireless protocols have different features, such as speed, range, security, and compatibility. If the older phone and the new phone use different wireless protocols, they may not be able to transfer data smoothly or at all. For example, if the older phone uses Wi-Fi Direct and the new phone uses Bluetooth, they may not be able to connect or recognize each other.
To avoid this problem, you should make sure that both devices support the same wireless protocol and that they are in range of each other. You can also use a third-party app or service that can transfer data between different devices, such as Smart Switch1 or Move to iOS2. These apps can help you transfer data such as contacts, photos, messages, and more from your old phone to your new phone.
Reference:
2: Failure of data transfer from android to ... - Apple Community
1: Smart Switch Transfer Issues - Samsung Electronics America
質問 # 115
An IT manager is evaluating ticket resolution times. While reviewing the data, the manager notices repetitive issues are taking longer than expected to resolve. Which of the following changes should the manager implement to resolve repetitive issues more quickly?
- A. Require the technicians to spend more time testing theories to determine the root causes of issues.
- B. Require the technicians to gather more information when speaking with users about issues.
- C. Require the technicians to verify full system functionality when resolving issues.
- D. Require the technicians to document the findings, action, and outcomes of issues.
正解：D
解説：
By documenting the findings, action, and outcomes of issues, the technicians can create a knowledge base that can be used to resolve similar issues in the future more quickly and efficiently. The documentation can also help identify patterns or trends that can lead to preventive measures or root cause analysis. Documenting the issues can also improve communication and collaboration among technicians and users, as well as provide evidence of service quality and performance. Reference: https://partners.comptia.org/docs/default-source/resources/a-core-1-content-guide (page 4)
質問 # 116
A user who works with sensitive data has a computer configured with hard drive encryption The TPM is active and hosting the encrypted key. After an upgrade to the motherboard. RAM and video card the hard drive is not booting and data cannot be accessed from the hard drive. Which of the following should the technician do to enable the system to boot again and get access to the stored data?
- A. Access the BIOS and select to rebuild the degraded RAID array
- B. Boot into the BIOS and enable the TPM on the new motherboard.
- C. Return the replaced motherboard back to the computer
- D. Use data recovery software to find and recover the hard drive information
正解：B
解説：
Explanation
The technician should boot into the BIOS and enable the TPM on the new motherboard to enable the system to boot again and get access to the stored data1.
Boot into the BIOS and enable the TPM on the new motherboard. Explanation: After upgrading the motherboard, the TPM may need to be enabled in the BIOS in order to access the encrypted key and boot the system. Enabling the TPM on the new motherboard should allow the system to boot and provide access to the encrypted data. References: CompTIA A+ Certification Exam Guide, 220-1001, Chapter 13
質問 # 117
An integrated webcam on a user's laptop broke, so a technician installed a temporary, external webcam. Since the external webcam installation, other users can only see part of the user's face during videoconferences. Which of the following BEST describes the reason for this issue?
- A. The webcam is not compatible with the OS.
- B. The webcam driver should be updated.
- C. The webcam is plugged into the wrong USB port.
- D. The webcam is not on a level surface.
正解：D
解説：
The most likely reason for the issue is that the webcam is not on a level surface, which causes the camera angle to be distorted. The user should adjust the position of the webcam so that it is aligned with the laptop screen and captures the user's face fully. The other options are not relevant to this issue, as they would not affect the camera angle or visibility of the user's face. Verified Reference: How to Position Your Webcam Correctly.
質問 # 118
Which of the following wireless technologies would a company most likely implement for inventory management?
- A. Bluetooth
- B. NFC
- C. RFID
- D. 5G
正解：C
解説：
Explanation
RFD stands for Radio Frequency Identification, which is a technology that uses radio waves to identify and track objects that have RFID tags attached to them. RFID tags are small devices that store information and can be read by RFID readers without direct contact or line of sight. RFID can be used for inventory management, as it can provide real-time visibility and accuracy of the location, quantity, and status of the items in a warehouse, store, or supply chain .
質問 # 119
A technician is setting up a projector for a videoconferencing system. The laptop that the technician is using is set to the correct resolution. The projector is receiving a signal, but the image is distorted. Which of the following most likely explains the issue?
- A. The laptop's video card has failed.
- B. The display brightness needs to be adjusted.
- C. The projector's bulb is burned out.
- D. The projector's aspect ratio is set incorrectly.
正解：D
解説：
Explanation
The most likely explanation for the distorted image on the projector is that the projector's aspect ratio is set incorrectly. The aspect ratio is the ratio of the width to the height of the image, and it affects how the image is displayed on the screen. If the aspect ratio of the projector does not match the aspect ratio of the laptop, the image may appear stretched, squashed, cropped, or letterboxed.
To fix the distorted image, the technician should follow these steps:
Check the aspect ratio of the laptop and the projector. The aspect ratio of the laptop can be found in the display settings of the operating system, such as Windows or Mac OS. The aspect ratio of the projector can be found in the user manual or the on-screen menu of the projector. Common aspect ratios are 4:3,
16:9, and 16:10.
Adjust the aspect ratio of the projector to match the aspect ratio of the laptop. The technician can use the remote control or the buttons on the projector to access the on-screen menu and select the appropriate aspect ratio option. Some projectors may have a dedicated aspect ratio button on the remote control or the projector itself.
Verify that the image is displayed correctly on the screen. The technician can use the zoom, focus, or keystone buttons on the projector or the remote control to fine-tune the image quality and alignment.
References:
How to Fix Projector Display Problems - Projectors Tab1
Correcting Distorted Projector Images - Projector Repair World Hyd2
How to Adjust the Aspect Ratio on a Projector - Lifewire
質問 # 120
A customer built a computer for gaming, sourcing individual components and then assembling the system. The OS starts up, but within a few minutes the machine locks up. The customer brought the computer to a technician to diagnose the issue.
正解：
解説：
Explanation:
correct answer is "Overclocking" and "Reduce CPU Clock speed" CPU is at 4.5 Ghz when normal is 3.2 Ghz.
Overclocking too much can cause freezes, and this is a gaming computer so the user probably took it too far.
http://blog.logicalincrements.com/2018/12/4-troubleshooting-tips-overclocking-pc/
質問 # 121
Which of the following DNS records is used to look up the IP address assigned to a domain name?
- A. A
- B. MX
- C. SPF
- D. NS
正解：A
解説：
Explanation
A DNS record is a data entry in a DNS server that maps a domain name to a specific value, such as an IP address, a mail server, a name server, or a text string. There are different types of DNS records for different purposes, and each type has a specific format and syntax12.
The A record, also known as the address record, is the most common type of DNS record, and it is used to look up the IP address assigned to a domain name. The A record maps a domain name to an IPv4 address, which is a 32-bit numerical value that identifies a device on the internet. For example, the A record for www.google.com is 172.217.14.20612.
The other options are not correct because they are not used to look up the IP address assigned to a domain name. The MX record, also known as the mail exchange record, is used to specify the mail servers that handle the email for a domain name. The MX record maps a domain name to a priority value and a host name of a mail server. For example, the MX record for gmail.com is 10 alt1.gmail-smtp-in.l.google.com12.
The NS record, also known as the name server record, is used to delegate a domain name to a set of authoritative name servers. The NS record maps a domain name to a host name of a name server that can provide authoritative answers for the domain name and its subdomains. For example, the NS record for example.com is ns1.example.com12.
The SPF record, also known as the sender policy framework record, is used to prevent email spoofing and spamming by validating the sender's identity. The SPF record maps a domain name to a text string that specifies the authorized mail servers and IP addresses that can send email on behalf of the domain name. For example, the SPF record for microsoft.com is v=spf1 include:spf.protection.outlook.com -all12.
References:
DNS Configuration - CompTIA A+ 220-1101 - 2.6
CompTIA A+ Certification Core 1 (220-1101) [Video] - Packt Subscription, Section 2: Networking, Video 2.6: DNS Configuration CompTIA A+ Certification Core 1 (220-1101) - GitHub, Slide Handout PDFs 1101, Chapter 2:
Networking, Slide 2.6: DNS Configuration
質問 # 122
A technician is setting up a video-editing workstation and the operating system is already installed on an internal M.2 drive.
The new workstation must meet the following requirements:
. Be able to edit files at the fastest speed
. Allow for disk failure without any downtime
Have 2TB of usable space
. Ensure the most robust fault tolerance
INSTRUCTIONS
Use the drop-down menus to select the appropriate RAID level, drive types, and drive sizes based on the requirements above. For each drive type that is selected, a corresponding drive size must also be selected.
正解：
解説：
Explanation
Based on the requirements, the best option for the video-editing workstation is to use RAID 10 with four SATA SSDs of 1TB each. This configuration will meet the following requirements:
Be able to edit files at the fastest speed: RAID 10 combines the advantages of RAID 0 and RAID 1, which are striping and mirroring, respectively. Striping can increase the data transfer rate by using multiple disks in parallel, while mirroring can provide redundancy and reliability by duplicating the data on another set of disks. SATA SSDs are also faster than HDDs or SSHDs, as they use flash memory instead of spinning disks, and they can offer lower latency, higher IOPS, and less noise and heat.
Allow for disk failure without any downtime: RAID 10 can withstand up to two disk failures, as long as they are not in the same mirrored pair. If one disk fails, the data can be read from or written to the other disk in the same pair, without affecting the performance or availability of the array. The failed disk can be replaced and rebuilt without interrupting the operation of the workstation.
Have 2TB of usable space: RAID 10 uses half of the total disk capacity for mirroring, so the usable space is equal to the size of two disks. By using four SATA SSDs of 1TB each, the total disk capacity is
4TB, and the usable space is 2TB, which meets the requirement.
Ensure the most robust fault tolerance: RAID 10 offers the highest level of fault tolerance among the standard RAID levels, as it can survive multiple disk failures and provide fast recovery. RAID 10 also has a low overhead, as it does not use parity or checksums, which can slow down the write performance or increase the complexity of the array.
Therefore, the technician should select the following options from the drop-down menus:
RAID level: RAID 10
Drive type 1: SATA SSD
Drive size 1: 1TB
Drive type 2: SATA SSD
Drive size 2: 1TB
Drive type 3: SATA SSD
Drive size 3: 1TB
Drive type 4: SATA SSD
Drive size 4: 1TB
Drive type 5: SATA SSD
Drive size 5: 1TB
質問 # 123
While using a popular videoconferencing program, the user selects a webcam, but the software is unable to open the webcam. The webcam was working the previous day. Which of the following should be done to address this issue?
- A. Reseat or replace the webcam.
- B. Close other video software and retry.
- C. Adjust the conference software to a compatible resolution.
- D. Switch the video from the webcam to "conference" mode.
正解：B
質問 # 124
A technician needs to recommend an internet connection for a customer who travels around the world and wants to have connectivity while visiting remote camping locations. Some of the locations the customer visits have limited or unreliable cellular service. Which of the following connection types should the technician recommend?
- A. Fiber
- B. DSL
- C. Hotspot
- D. Satellite
正解：D
解説：
Explanation
The connection type that the technician should recommend is Satellite. Satellite internet is a good option for people who travel around the world and want to have connectivity while visiting remote camping locations. It works by using terminals which can give you internet access in remote locations as long as they have a line of sight to the satellite in orbit above12 Since the customer travels to remote camping locations with limited or unreliable cellular service, the best recommendation is satellite internet connection. Satellite internet uses a dish to connect to satellites orbiting the earth, which can provide coverage anywhere in the world as long as there is a clear line of sight to the satellite. This is especially useful in remote areas where traditional terrestrial connections are not available.
References: CompTIA A+ Certification Exam Objectives - 220-1001: 1.6 Given a scenario, evaluate connection type and bandwidth.
質問 # 125
Which of the following wireless networking protocols will support both 2.4GHz and 5GHz devices?
- A. 802.11ac
- B. 802.11 ax
- C. 802.11b
- D. 802.11g
正解：B
解説：
802.11 ax is a wireless networking protocol that supports both 2.4GHz and 5GHz devices, as well as backward compatibility with previous 802.11 standards. 802.11 ax offers higher data rates, lower latency, increased capacity, and improved power efficiency than previous protocols. It is also known as Wi-Fi 6 or High Efficiency Wireless (HEW). Reference:
https://www.comptia.org/training/books/a-core-1-220-1101-study-guide (page 82)
質問 # 126
A user reports that a laptop correctly connects to the internet when docked at the office but is unable to access the internet when at home. Which of the following should the technician do first?
- A. Give the user a dock to use at home.
- B. Disable network security settings.
- C. Contact the user's home ISP
- D. Enable the wireless adapter.
正解：D
解説：
A wireless adapter is a device that allows a laptop to connect to a wireless network, such as a home Wi-Fi router. A wireless adapter can be either internal or external, and it can be enabled or disabled by the user or the operating system. If the wireless adapter is disabled, the laptop will not be able to access the internet when it is not connected to a wired network, such as the office dock.
The technician should do the following steps to enable the wireless adapter:
Check the physical switch or button on the laptop that controls the wireless adapter. Some laptops have a switch or button on the side, front, or keyboard that can turn on or off the wireless adapter. Make sure the switch or button is in the on position.
Check the software settings for the wireless adapter. In Windows 10, you can do this by clicking on the network icon in the system tray, and then clicking on the Wi-Fi icon. Make sure the Wi-Fi is turned on. You can also go to Settings > Network & Internet > Wi-Fi and make sure the Wi-Fi is turned on.
Check the device manager for the wireless adapter. In Windows 10, you can do this by right-clicking on the Start menu and selecting Device Manager. Expand the Network adapters category and look for your wireless adapter. Make sure it is enabled and has no errors. You can right-click on it and select Enable device or Update driver if needed.
If none of these steps work, there may be a hardware or software problem with the wireless adapter that requires further troubleshooting or replacement.
質問 # 127
While using a popular videoconferencing program, the user selects a webcam, but the software is unable to open the webcam. The webcam was working the previous day. Which of the following should be done to address this issue?
- A. Reseat or replace the webcam.
- B. Close other video software and retry.
- C. Adjust the conference software to a compatible resolution.
- D. Switch the video from the webcam to "conference" mode.
正解：B
解説：
Web cameras can input to one software at a time. Closing other video software is the first step in troubleshooting the issue as it doesn't require customer or on-site support. After restarting the computer and adjusting the drivers, it would be time to ask the customer to reseat the webcam or replace the device.
質問 # 128
Which of the following protocols provides the fastest bandwidth?
- A. 802.11n
- B. 802.11ac
- C. 802.11ax
- D. 802.11a
正解：C
解説：
The 802.11ax protocol, also known as Wi-Fi 6, provides the fastest bandwidth among the options listed. It can achieve up to 10 Gbps of data transfer rate, using technologies such as OFDMA, MU-MIMO, and 1024-QAM. The 802.11ac protocol, or Wi-Fi 5, is the second fastest, with a maximum of 3.46 Gbps, followed by the 802.11n protocol, or Wi-Fi 4, with a maximum of 600 Mbps. The 802.11a protocol is the slowest, with a maximum of 54 Mbps
https://www.lifewire.com/wireless-standards-802-11a-802-11b-g-n-and-802-11ac-816553
質問 # 129
A user needs to transfer files from an Apple phone to a workstation. Which of the following connection types should the user utilize?
- A. USB-C
- B. Lightning
- C. NFC
- D. Serial
正解：B
解説：
Explanation
Lightning is a proprietary connection type that is used by Apple devices, such as iPhones, iPads, and iPods, to transfer data, charge, and connect to accessories. Lightning cables have a reversible 8-pin connector that can be plugged into a USB port on a workstation or a power adapter. USB-C, serial, and NFC are not compatible with Apple phones.
質問 # 130
......
CompTIA A+ 認定は、IT フィールドに入りたい個人にとって重要な資格です。世界的に認められ、多くのエントリーレベルの IT ポジションには必須の要件となっています。この認定は、CompTIA Network+、Security+、Cybersecurity Analyst (CySA+) 認定などのより高度な認定へのステップともなります。CompTIA A+ 認定を取得するためには、CompTIA A+ 認定試験: Core 1 (220-1101) が出発点となり、IT サポートのキャリアを追求するために必要不可欠なステップとなります。
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