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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
  • Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
トピック 2
  • Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.
トピック 3
  • Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
トピック 4
  • Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.

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高品質なCompTIA XK0-006認定試験の問題集を入手しよう

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CompTIA Linux+ Certification Exam 認定 XK0-006 試験問題 (Q83-Q88):

質問 # 83
Which of the following is the location for built-in Linux executable files and utilities?

正解：B

解説：
/bin contains essential built-in Linux executable files and core command-line utilities required for basic system operation and user tasks.


質問 # 84
The development team asks a Linux administrator to help diagnose a connectivity issue that is occurring with a newly developed software. The Linux administrator reviews the following output:

Which of the following actions is a best way to resolve the issue?

正解：A

解説：
The error shows the certificate is not trusted because the issuer is unknown to the local system.
The best fix is to verify that the remote certificate and issuing CA are legitimate, then add the trusted CA certificate to the system's certificate trust store.


質問 # 85
A Linux systems administrator needs to extract the contents of a file named /home/dev/web.bkpto the /var/www/html/directory.
Which of the following commands should the administrator use?

正解：C

解説：
The .bkp file here is a cpio archive, not a tar or zip. The correct way to extract it is by changing into the target directory (/var/www/html/) and using cpio -idv < /home/dev/web.bkp. The pushd and popd commands ensure the administrator returns to the original directory afterward.


質問 # 86
A systems administrator receives reports from users who are having issues while trying to modify newly created files in a shared directory. The administrator sees the following outputs:

Which of the following provides the best resolution to this issue?

正解：B

解説：
This scenario involves shared directory collaboration, which is a common system management task covered in the CompTIA Linux+ V8 objectives. The key issue is that users can create files in the shared directory, but other users in the same group cannot modify those files. This behavior is directly related to group ownership inheritance.
By default, when a user creates a file or directory, it is owned by the user and assigned the user's primary group, not necessarily the group of the parent directory. As shown in the output, files inside /share are owned by different groups (student, student2, student3), which prevents other group members from modifying them, even though the parent directory is group-writable.
The correct solution is to set the setgid (set group ID) bit on the shared directory, making option D correct.
When the setgid bit is applied to a directory, all newly created files and subdirectories inherit the group ownership of the parent directory, rather than the creator's primary group. This ensures consistent group ownership and allows all members of the shared group to collaborate effectively.
The other options are incorrect or poor practice. Option A (setuid) is intended for executables, not directories.
Option B requires constant manual intervention and does not scale. Option C weakens security by granting write access to all users, violating the principle of least privilege.
Linux+ V8 documentation explicitly recommends using the setgid bit on shared directories to manage collaborative access securely and efficiently.


質問 # 87
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:

Which of the following is the most likely cause of the issue?

正解：A

解説：
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.


質問 # 88
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毎年のXK0-006試験問題は、テストの目的に基づいてまとめられています。すべての回答はテンプレートであり、2つのパートの主観的および客観的なXK0-006試験があります。この目的のために、認定試験のXK0-006トレーニング資料では、問題解決スキルを要約し、一般的なテンプレートを紹介しています。ユーザーは、提供された回答テンプレートに基づいて回答をスカウトし、スコアをスカウトできます。そのため、ユニバーサルテンプレートは、ユーザーがXK0-006試験を勉強して合格するための貴重な時間を大幅に節約できます。

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