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CompTIA XK0-006 考試大綱：

主題	簡介
主題 1	Troubleshooting: Addresses diagnosing and resolving issues across system health, hardware, storage, networking, security configurations, and performance optimization.
主題 2	Services and User Management: Covers day-to-day Linux administration including file management, user accounts, processes, software, services, and container operations.
主題 3	Security: Focuses on securing Linux systems through authentication, firewalls, OS hardening, account policies, cryptography, and compliance checks.
主題 4	Automation, Orchestration, and Scripting: Covers task automation with tools like Ansible, shell and Python scripting, Git version control, and responsible AI-assisted development.

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最新的 Linux+ XK0-006 免費考試真題 (Q158-Q163):

問題 #158
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?

A. The administrator forgot to restart the SSHD after creating the authorized_keysfile.
B. The SELinux policy is incorrectly targeting the unconfined_ucontext.
C. The authorized_keysfile has the incorrect root permissions assigned.
D. The authorized_keysfile does not have the correct security context to match SELinux policy.

答案：D

解題說明：
The log shows avc: denied { read } caused by SELinux when sshd tries to access authorized_keys. The file has the wrong SELinux context (unconfined_u:object_r:home_root_t) instead of the expected context for SSH. This mismatch blocks SSH key authentication even though file permissions are correct. Adjusting the SELinux context (e.g., with restorecon) resolves the issue.

問題 #159
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. Set the user's files to immutable.
B. Change the user's shell to /sbin/nologin.
C. Change the date on the /home folder to that of the expected return date.
D. Run the command passwd -l user.
E. Delete the user's /home folder.
F. Instruct the user to log in once per week.

答案：B,D

解題說明：
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.

問題 #160
Which of the following utilities supports the automation of security compliance and vulnerability management?

A. AIDE
B. SELinux
C. OpenSCAP
D. Nmap

答案：C

解題說明：
OpenSCAP is a framework that automates security compliance checking and vulnerability management by using standardized security content (SCAP). It helps administrators enforce policies and detect vulnerabilities.

問題 #161
A user reports issues when trying to connect to one of the Linux servers. The server administrator reviews the following outputs:

Which of the following statements describes the cause and resolution for this issue?

A. The messages point to a hardware issue that should be addressed by the server team.
B. The current kernel is corrupted and should be reinstalled.
C. All available CPUs have been exhausted, and a new CPU should be added.
D. The system has crashed and needs to be rebooted to fix the issue.

答案：A

解題說明：
The logs show machine check exceptions and a fatal machine check kernel panic, which indicate hardware-level errors detected by the CPU. These errors are typically related to faulty hardware components and must be investigated and resolved by the server or hardware support team rather than through software remediation.

問題 #162
A user reports recurrent issues with an application, which is currently operational. The systems administrator gathers the following outputs to diagnose the issue:

Which of the following is a possible cause of this issue?

A. The system is using all the swap
B. A backup is consuming all the system memory.
C. The process is showing signs of a memory leak.
D. The cached memory is approaching the system's limits.

答案：C

解題說明：
The logs show repeated out-of-memory kills involving the mariadb process, and the memory statistics show sustained high memory usage with no swap configured. Since the application is currently running but repeatedly grows until the kernel kills it, the likely cause is a memory leak in the process.

問題 #163
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