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CompTIA XK0-006 認定試験の出題範囲：

トピック	出題範囲
トピック 1	サービスとユーザー管理：ファイル管理、ユーザーアカウント、プロセス、ソフトウェア、サービス、コンテナ操作など、日常的なLinux管理を網羅しています。
トピック 2	自動化、オーケストレーション、スクリプト作成：Ansible、シェルスクリプト、Pythonスクリプト、Gitバージョン管理、責任あるAI支援開発などのツールを用いたタスク自動化について解説します。
トピック 3	トラブルシューティング：システムの状態、ハードウェア、ストレージ、ネットワーク、セキュリティ構成、パフォーマンス最適化など、システム全体にわたる問題の診断と解決に対応します。
トピック 4	セキュリティ：認証、ファイアウォール、OSの強化、アカウントポリシー、暗号化、コンプライアンスチェックなどを通じてLinuxシステムのセキュリティを確保することに重点を置いています。

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XK0-006試験に出席するための勉強は、メソッドに注意を払います。良い方法は、多くの場合、半分の労力で結果をもたらすことができます。したがって、私たちは試験の時間であり、また受験スキルを知っている必要があります。 XK0-006クイズガイドは過去数年間の要約に基づいており、回答には特定のルールがあり、主観的または客観的な質問のいずれかが見つかります。共通する類似の対応モジュールで見つけることができます。このため、XK0-006試験のダンプでは、XK0-006試験に合格するのに役立つ資格試験のいくつかのタイプの質問をまとめています。

CompTIA Linux+ Certification Exam 認定 XK0-006 試験問題 (Q71-Q76):

質問 # 71
An administrator must secure an account for a user who is going on extended leave. Which of the following steps should the administrator take? (Choose two)

A. Change the user's shell to /sbin/nologin.
B. Change the date on the /home folder to that of the expected return date.
C. Delete the user's /home folder.
D. Instruct the user to log in once per week.
E. Set the user's files to immutable.
F. Run the command passwd -l user.

正解：A、F

解説：
Comprehensive and Detailed 250 to 350 words of Explanation From Linux+ V8 documents:
Securing dormant or temporarily unused user accounts is a best practice emphasized in the Security domain of CompTIA Linux+ V8. When a user goes on extended leave, the goal is to prevent unauthorized access while preserving the user's data and account for future use.
The most effective approach is to disable authentication and interactive login access without deleting the account. Option D, running passwd -l user, locks the user's password by prepending an invalid character to the encrypted password in /etc/shadow. This prevents password-based authentication while retaining the account, files, and ownership information. Linux+ V8 documentation highlights password locking as a standard method for temporarily disabling accounts.
Option F, changing the user's shell to /sbin/nologin, further strengthens account security by preventing interactive shell access entirely. Even if another authentication mechanism were attempted, the user would be denied a login shell. This is a common defense-in-depth measure and is explicitly referenced in Linux+ V8 objectives for access control and account hardening.
The other options are incorrect or inappropriate. Option A (immutable files) does not prevent account access and may interfere with system operations. Option B defeats the purpose of securing an inactive account.
Option C deletes user data, which is unnecessary and risky. Option E has no security effect, as filesystem timestamps do not control access.
Linux+ V8 stresses that secure account management should be reversible, auditable, and minimally disruptive. Locking the password and disabling the login shell meet these criteria and are commonly used together in enterprise environments.

質問 # 72
You are a systems administrator and have created an uncompressed backup of the application directory. Several hours later, you must restore the application from backup.
INSTRUCTIONS
Within each tab, click on an object to form the appropriate command used to create the backup and restore the application.
Command objects may only be used once, and not all will be used. Click the arrow to remove any unwanted objects from your command.
If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

正解：

解説：
see the solution in Explanation below.
Explanation:

This performance-based question tests correct use of the tar utility for backup and restore operations, which is part of System Management in CompTIA Linux+ V8. The key detail is that the backup is explicitly described as uncompressed, so the correct archive file must be a plain .tar file rather than .tar.gz, .tgz, or .tar.bz2.
For the backup command, the correct syntax is:
tar -cvf /backups/application.tar -C /opt/ application
Here, -c creates the archive, -v enables verbose output, and -f specifies the archive filename. The -C /opt/ option changes to the /opt/ directory before archiving, and application is then archived relative to that location. This is the correct Linux+ method because it avoids storing unnecessary leading path components in the archive.
For the restore command, the correct syntax is:
tar -xvf /backups/application.tar -C /opt/
Here, -x extracts the archive, -v displays files being restored, and -f identifies the archive file. The -C /opt/ option ensures the archived application directory is restored back into /opt/, recreating /opt/application correctly.
The other file choices such as /backups/application.tar.gz, /backups/application.tgz, and /backups/application.
tar.bz2 are incorrect because they indicate compressed backups, which the question specifically rules out.
Likewise, options such as -xzvf or -xjvf are used for gzip- or bzip2-compressed archives and would not apply here.
Therefore, the verified correct PBQ answers are:
Backup: tar -cvf /backups/application.tar -C /opt/ application
Restore: tar -xvf /backups/application.tar -C /opt/

質問 # 73
A systems administrator wants to terminate all the processes owned by testuser on a Linux VM.
Which of the following should the administrator use for this task?

A.
B.
C. while true; do killall; done
D.

正解：D

解説：
This command identifies all processes owned by the specified user by extracting their process IDs and then terminates each one, ensuring that all running processes belonging to that user are stopped.

質問 # 74
An administrator wants to see all logs for the app.servicesystemd process. Which of the following commands should the administrator use to complete this task?

A. systemctl status app.service
B. cat /var/log/messages
C. systemd-analyze unit-files app.service
D. journalctl -u app.service

正解：D

解説：
The journalctl command queries the systemd journal, and using -u app.service filters the output to logs generated by that specific systemd unit.

質問 # 75
Which of the following best describes the role of initrd?

A. It contains trusted certificates and secret keys of the system.
B. It contains basic kernel modules and drivers required to start the system.
C. It is required to initialize a random device within a Linux system.
D. It is required to connect to the system via SSH.

正解：B

解説：
initrd (initial ramdisk) provides essential kernel modules and drivers (e.g., for storage and filesystems) needed during the early boot process before the root filesystem is mounted.

質問 # 76
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