CompTIA XK0-006 Sample Questions with Explanations

These original sample questions are designed to help you check how the exam topics appear in decision-style prompts. They are not taken from the live exam.

Use these sample questions as a guided self-assessment for CompTIA Linux+ (XK0-006) topics such as permissions, services, storage, networking, security controls, shell scripting, automation, and troubleshooting. The prompts emphasize safe Linux administration and verification.

Where these questions fit in the XK0-006 guide

The sample set below is part of the CompTIA XK0-006 guide path:

• CompTIA certification hub
• XK0-006 exam guide
• XK0-006 cheat sheet
• XK0-006 study plan
• XK0-006 FAQ
• XK0-006 resources
• XK0-006 glossary

XK0-006 Linux administration sample questions

Work through each prompt before opening the explanation. XK0-006 questions usually reward answers that verify the symptom, preserve access, make persistent changes correctly, and avoid disabling controls as a shortcut.

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Question 1

Topic: Fixing service startup persistence

A web service starts successfully when an administrator runs it manually, but it does not start after reboot. What should the administrator check first on a systemd-based distribution?

• A. Whether the server has a larger monitor attached.
• B. Whether the service unit is enabled and whether systemctl status or journal logs show startup errors.
• C. Whether the root password can be emailed to users.
• D. Whether all firewall rules can be deleted before the next reboot.

Best answer: B

Explanation: Linux+ questions often distinguish a manual start from persistent service configuration. On systemd systems, enabled state, unit status, and logs are the first evidence to inspect.

Why the other choices are weaker:

• A is unrelated to service startup.
• C is insecure and irrelevant.
• D is disruptive and does not diagnose the startup problem.

What this tests: systemd, service enablement, status checks, logs, and persistent configuration.

Related topics: systemd; Services; Logs; Persistence

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Question 2

Topic: Permission troubleshooting

A script owned by root should be executable by members of the ops group, but group members get a permission denied error. Which check best targets the likely issue?

• A. Disable all permissions by setting mode 000.
• B. Move the script to /tmp and make it world-writable.
• C. Check file ownership, group ownership, execute bits, parent-directory permissions, and group membership.
• D. Reboot repeatedly until the permissions refresh.

Best answer: C

Explanation: Executing a file depends on ownership, mode bits, directory traversal permissions, and whether the user is actually in the intended group.

Why the other choices are weaker:

• A removes access instead of fixing it.
• B creates a security problem.
• D does not change permissions or membership by itself.

What this tests: chmod, chown, groups, execute bits, directory traversal, and safe troubleshooting.

Related topics: Permissions; Groups; chmod; Troubleshooting

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Question 3

Topic: Network service reachability

A database service is running locally, but remote clients cannot connect. What is the best first troubleshooting sequence?

• A. Immediately disable the host firewall permanently.
• B. Change every user’s shell to /bin/false.
• C. Delete the service package before checking logs.
• D. Verify the service is listening on the expected address and port, then check local firewall rules, routing, DNS or name resolution, and client path evidence.

Best answer: D

Explanation: Linux network troubleshooting should move from local service state to listener binding, host firewall, path, and name-resolution evidence. It avoids guessing and preserves controls.

Why the other choices are weaker:

• A is an unsafe shortcut and may not address the root cause.
• B is unrelated to service reachability.
• C removes the service before diagnosis.

What this tests: listening ports, firewall, routing, DNS, logs, and connectivity troubleshooting.

Related topics: Networking; Firewall; Ports; DNS

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