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試験は90の多肢選択とパフォーマンスベースの質問からなり、受験者は90分で完了する必要があります。試験料は329ドルであり、認定は3年間有効です。認定には、試験に合格し、特定の経験と教育要件を満たす必要があります。
CompTIA XK0-005、またはCompTIA Linux+認定試験は、Linuxオペレーティングシステムで作業したいと考える候補者のスキルや知識を検証するために設計されたベンダー中立の認定試験です。この試験は、Linuxでの経験があり、IT分野でキャリアを発展させたい人を対象にしています。この認定は、候補者がLinuxシステム管理について強い理解を持ち、プロの環境でLinuxシステムを管理およびトラブルシューティングできることを証明します。
CompTIA XK0-005認定試験は、Linuxシステム管理者に必要なスキルと知識を検証するためのベンダー中立型の認定試験です。この認定試験は、Linuxシステムを扱い、Linuxシステムの管理と設定のスキルを検証したいITプロフェッショナルを対象としています。この認定試験は、Linuxシステム管理のスキルと知識を向上させたい人にとって理想的です。
質問 # 119
A Linux administrator needs to create a new cloud.cpio archive containing all the files from the current directory. Which of the following commands can help to accomplish this task?
- A. ls | cpio -iv < cloud.epio
- B. ls | cpio -ov > cloud.cpio
- C. ls | cpio -iv > cloud.epio
- D. ls cpio -ov < cloud.cpio
正解：B
質問 # 120
Rugged appliances are small appliances with ruggedized hardware and like Quantum Spark appliance they use which operating system?
- A. Gaia
- B. Red Hat Enterprise Linux version 5
- C. Centos Linux
- D. Gaia embedded
正解：D
質問 # 121
A junior systems administrator has just generated public and private authentication keys for passwordless login. Which of the following files will be moved to the remote servers?
- A. id_rsa
- B. id_dsa.pem
- C. id_ecdsa
- D. id_rsa.pub
正解：D
解説：
Explanation
The file id_rsa.pub will be moved to the remote servers for passwordless login. The id_rsa.pub file is the public authentication key that is generated by the ssh-keygen command. The public key can be copied to the remote servers by using the ssh-copy-id command or manually. The remote servers will use the public key to authenticate the user who has the corresponding private key (id_rsa). This will allow the user to log in without entering a password. The other options are incorrect because they are either private keys (id_rsa, id_dsa.pem, or id_ecdsa) or non-existent files (id_dsa.pem or id_ecdsa). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 13: Managing Network Services, page 410.
質問 # 122
A Linux administrator has been tasked with installing the most recent versions of packages on a RPM-based OS. Which of the following commands will accomplish this task?
- A. dnf update
- B. apt-get upgrade
- C. rpm -a
- D. yum check-update
- E. yum updateinfo
正解：A
質問 # 123
A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.
To troubleshoot the issue, the systems administrator runs netstat and receives the following output:
Based on the information above, which of the following is causing the issue?
- A. The IP address 0.0.0.0 is not valid.
- B. The application is listening on port 1234.
- C. The application is listening on the loopback interface.
- D. The application is not running.
正解：C
質問 # 124
A systems administrator made some unapproved changes prior to leaving the company. The newly hired administrator has been tasked with revealing the system to a compliant state. Which of the following commands will list and remove the correspondent packages?
- A. dnf list and dnf remove last
- B. dnf remove and dnf check
- C. dnf info and dnf upgrade
- D. dnf history and dnf history undo last
正解：D
質問 # 125
A Linux engineer needs to create a custom script, cleanup.sh, to run at boot as part of the system services. Which of the following processes would accomplish this task?
- A. Create a unit file in the /etc/systemd/system/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup - B. Create a unit file in the /etc/ske1/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup - C. Create a unit file in the /etc/default/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup - D. Create a unit file in the /etc/sysctl.d/ directory.
systemctl enable cleanup
systemctl is-enabled cleanup
正解：A
解説：
The process that will accomplish the task of creating a custom script to run at boot as part of the system services is:
Create a unit file in the /etc/systemd/system/ directory. A unit file is a configuration file that defines the properties and behavior of a systemd service. The systemd is a system and service manager that controls the startup and operation of Linux systems. The /etc/systemd/system/ directory is the location where the administrator can create and store custom unit files. The unit file should have a name that matches the name of the script, such as cleanup.service, and should contain the following sections and options:
[Unit]: This section provides the general information about the service, such as the description, dependencies, and conditions. The administrator should specify the following options in this section:
Description: A brief description of the service, such as "Custom cleanup script".
After: The name of another unit that this service should start after, such as "network.target".
ConditionPathExists: The path of the file or directory that must exist for the service to start, such as "/opt/scripts/cleanup.sh".
[Service]: This section defines how the service should be started and stopped, and what commands should be executed. The administrator should specify the following options in this section:
Type: The type of the service, such as "oneshot", which means that the service will run once and then exit.
ExecStart: The command that will start the service, such as "/bin/bash /opt/scripts/cleanup.sh".
RemainAfterExit: A boolean value that indicates whether the service should remain active after the command exits, such as "yes".
[Install]: This section defines how the service should be enabled and under what circumstances it should be started. The administrator should specify the following option in this section:
WantedBy: The name of another unit that wants this service to be started, such as "multi-user.target", which means that the service will be started when the system reaches the multi-user mode.
Run the command systemctl enable cleanup. This command will enable the service and create the necessary symbolic links to start the service at boot.
Run the command systemctl is-enabled cleanup. This command will check the status of the service and confirm that it is enabled.
This process will create a custom script, cleanup.sh, to run at boot as part of the system services. This is the correct process to use to accomplish the task. The other options are incorrect because they either use the wrong directory for the unit file (/etc/default/, /etc/skel/, or /etc/sysctl.d/) or do not create a unit file at all. Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 15: Managing System Services, pages 457-459.
質問 # 126
One leg of an LVM-mirrored volume failed due to the underlying physical volume, and a systems administrator is troubleshooting the issue. The following output has been provided:
Given this scenario, which of the following should the administrator do to recover this volume?
- A. Reboot the server. The volume will automatically go back to linear mode.
- B. Replace the failed drive and reconfigure the mirror.
- C. Recreate the logical volume.
- D. Reboot the server. The volume will revert to stripe mode.
正解：B
解説：
The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The LVM (Logical Volume Manager) is a tool for managing disk space on Linux systems. The LVM allows the administrator to create logical volumes that span across multiple physical volumes, such as hard disks or partitions. The LVM also supports different types of logical volumes, such as linear, striped, or mirrored. A mirrored logical volume is a type of logical volume that creates a copy of the data on another physical volume, providing redundancy and fault tolerance. The output shows that the logical volume is mirrored and that one leg of the mirror has failed due to the underlying physical volume. This means that one of the physical volumes that contains the data of the logical volume is damaged or missing. This can cause data loss and performance degradation. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. The administrator should identify the failed physical volume by using commands such as pvdisplay, vgdisplay, or lvdisplay. The administrator should then remove the failed physical volume from the volume group by using the vgreduce command. The administrator should then install a new drive and create a new physical volume by using the pvcreate command. The administrator should then add the new physical volume to the volume group by using the vgextend command. The administrator should then reconfigure the mirror by using the lvconvert command. The administrator should replace the failed drive and reconfigure the mirror to recover the volume. This is the correct answer to the question. The other options are incorrect because they either do not recover the volume (reboot the server. The volume will automatically go back to linear mode or reboot the server. The volume will revert to stripe mode) or do not preserve the data of the volume (recreate the logical volume). Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 10: Managing Storage, pages 333-334.
質問 # 127
A Linux systems administrator receives a notification that one of the server's filesystems is full. Which of the following commands would help the administrator to identify this filesystem?
- A. fdisk
- B. lsblk
- C. du -ah
- D. df -h
正解：D
質問 # 128
After installing some RPM packages, a systems administrator discovers the last package that was installed was not needed. Which of the following commands can be used to remove the package?
- A. dnf remove packagename
- B. rpm -i packagename
- C. apt remove packagename
- D. apt-get remove packagename
正解：A
質問 # 129
Which of the following tools is BEST suited to orchestrate a large number of containers across many different servers?
- A. Podman
- B. Kubernetes
- C. Terraform
- D. Ansible
正解：B
質問 # 130
A Linux administrator is troubleshooting a memory-related issue. Based on the output of the commands:
Which of the following commands would address the issue?
- A. top -p 8321
- B. renice -10 8321
- C. free 8321
- D. kill -9 8321
正解：B
質問 # 131
A Linux administrator needs to obtain a list of all volumes that are part of a volume group. Which of the following commands should the administrator use to accomplish this task?
- A. lvs
- B. pvs
- C. vgs
- D. fdisk -1
正解：A
質問 # 132
A systems administrator has been unable to terminate a process. Which of the following should the administrator use to forcibly stop the process?
- A. kill -15
- B. kill -HUP
- C. kill -9
- D. kill -TERM
- E. kill -1
正解：B
質問 # 133
A systems administrator is troubleshooting a connectivity issue pertaining to access to a system named db.example.com. The system IP address should be 192.168.20.88. The administrator issues the dig command and receives the following output:
The administrator runs grep db.example.com /etc/hosts and receives the following output:
Given this scenario, which of the following should the administrator do to address this issue?
- A. Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.89.
- B. Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.
- C. Modify the /etc/network file and change the db.example.com entry to 192.168.20.88.
- D. Modify the /etc/network file and change the db.example.com entry to 192.168.20.89.
正解：A
質問 # 134
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