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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Available Languages: | English |
| Passing Score: | 720 (scale 100–900) |
| Exam Price: | $358 USD |
| Exam Format: | Performance-based questions, Multiple-choice |
| Certificate Validity Period: | 3 years |
| Real Exam Qty: | Up to 90 |
| Related Certifications: | CompTIA A+ CompTIA Server+ CompTIA Network+ |
| Exam Duration: | 90 minutes |
| Recommended Training: | CompTIA CertMaster Learn CompTIA Official Study Materials |
| Exam Registration: | Pearson VUE Exam Scheduling CompTIA Official Registration |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online proctored or onsite at Pearson VUE testing centers |
| Pre Condition: | No mandatory prerequisites; 12 months of hands-on Linux experience or CompTIA A+/Network+/Server+ recommended |
| Official Syllabus URL: | https://www.comptia.org/certifications/linux |
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NEW QUESTION # 145
A systems administrator is developing a script to copy a file if it exists and return an error if it does not. Given the following incomplete script:
Which of the following statements is missing from the script?
Answer: B
Explanation:
An else statement is required to handle the condition when the file does not exist so the script can return the error message instead of attempting the copy operation.
NEW QUESTION # 146
Users cannot access a server after it has been restarted. At the server console, the administrator runs the following commands;
Which of the following is the cause of the issue?
Answer: B
Explanation:
This issue is a classic example of post-reboot connectivity troubleshooting, which falls under the Troubleshooting domain of CompTIA Linux+ V8. The administrator has correctly gathered evidence using multiple diagnostic tools, allowing the root cause to be identified through correlation.
The ss -lnt output confirms that the SSH daemon is running and listening on TCP port 22. This eliminates the possibility that the SSH service failed to start after reboot. Additionally, the uptime output shows a very low load average, indicating that system performance is not a limiting factor. The successful ping test confirms that the server is reachable at the network layer and that DNS resolution and basic connectivity are functioning correctly.
The critical clue comes from the firewall configuration. The output of firewall-cmd --list-all shows that only specific services are allowed through the firewall, such as https, dns, and cockpit. The SSH service is notably absent. On systems using firewalld, services must be explicitly allowed, even if the daemon itself is running and listening on the correct port.
As a result, incoming SSH connection attempts are being blocked by the firewall, preventing users from accessing the server remotely after reboot. This aligns precisely with option B.
The other options are incorrect. DNS is functioning, as shown by successful ping responses. System load is low and not contributing to the issue. There is no indication that users are attempting to access the web server using an incorrect protocol.
Linux+ V8 documentation emphasizes that administrators must verify both service status and firewall rules when diagnosing access issues. In this case, allowing SSH with a command such as firewall-cmd --add- service=ssh --permanent followed by a reload would resolve the problem.
NEW QUESTION # 147
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?
Answer: D
Explanation:
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.
NEW QUESTION # 148
A Linux administrator attempts to unmount the local filesystem /datain order to mount a new volume. However, the administrator receives the following error message:
umount: /data: target is busy
Which of the following commands should the administrator run to resolve the issue?
Answer: D
Explanation:
The fuser command identifies and terminates processes that are actively using the /data filesystem, allowing it to be safely unmounted once those processes are stopped.
NEW QUESTION # 149
Which of the following most accurately describes a webhook?
Answer: C
Explanation:
The correct answer is D. An HTTP-based callback function. A webhook is a mechanism that allows one system to automatically send real-time data to another system via HTTP when a specific event occurs. Instead of continuously polling an API for updates, a webhook enables event-driven communication, making automation more efficient and responsive.
In practical Linux and DevOps environments, webhooks are widely used in automation, orchestration, and integration workflows. For example, a version control system like GitHub can trigger a webhook to notify a CI
/CD pipeline whenever new code is pushed. The receiving system exposes an HTTP endpoint (URL), and when the event occurs, the webhook sends an HTTP POST request with relevant data payload. This design significantly reduces overhead compared to polling mechanisms.
Option A is incorrect because webhooks are not authentication mechanisms. While authentication (such as tokens or signatures) may be used to secure webhook communication, it is not their primary purpose.
Option B is incorrect because SNMP (Simple Network Management Protocol) is unrelated to webhooks.
SNMP is used for monitoring and managing network devices, whereas webhooks operate over HTTP/HTTPS protocols.
Option C is incorrect because although webhooks can transmit data (including sensitive information if not properly secured), their purpose is not specifically to transmit sensitive data but to notify systems of events through automated callbacks.
From a Linux+ perspective, understanding webhooks is essential in automation and orchestration tasks. They are commonly integrated into scripts, configuration management tools, and cloud-native workflows to enable reactive, event-driven system behavior, improving efficiency and scalability in modern infrastructure environments.
NEW QUESTION # 150
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