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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Certificate Validity Period: | 3 years |
| Exam Price: | $358 USD |
| Passing Score: | 720 (scale 100โ900) |
| Related Certifications: | CompTIA Server+ CompTIA A+ CompTIA Network+ |
| Available Languages: | English |
| Exam Duration: | 90 minutes |
| Exam Format: | Multiple-choice, Performance-based questions |
| Real Exam Qty: | Up to 90 |
| Recommended Training: | CompTIA CertMaster Learn CompTIA Official Study Materials |
| Exam Registration: | CompTIA Official Registration Pearson VUE Exam Scheduling |
| 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 # 79
A Linux systems administrator makes updates to systemd-managed service configuration files. Which of the following commands should the administrator execute in order to implement the changes?
Answer: B
Explanation:
In the systemd architecture, service configurations are stored in unit files (e.g., .service, .timer, .mount) located in directories like /etc/systemd/system/ or /usr/lib/systemd/system/. When an administrator modifies these files or creates new ones, the systemd manager does not automatically detect the changes. According to the CompTIA Linux+ V8 curriculum, the command systemctl daemon-reload is required to notify systemd that it needs to rescan the configuration directories and rebuild its internal dependency tree.
Without running daemon-reload, attempting to start or restart the service would result in systemd using the old, cached version of the unit file, or it might generate a warning stating that " the unit file on disk has changed. " This command is a safe operation that does not stop running services; it simply refreshes the manager ' s awareness of the current configuration.
The other options are insufficient for " implementing the changes " to the configuration files themselves.
systemctl enable (Option A) creates the links for starting the service at boot. systemctl start (Option B) attempts to launch the service. systemctl restart (Option C) stops and then starts a service, but if the unit file was changed and daemon-reload was not run, it may fail or use outdated settings.
Thus, systemctl daemon-reload is the essential first step after any modification to a systemd unit file.
NEW QUESTION # 80
A systems administrator troubleshoots a connectivity issue and needs to determine whether port
449 is open. Which of the following commands should the administrator use?
Answer: C
Explanation:
This command displays active and listening network sockets, allowing the administrator to verify whether port 449 is open by checking for its presence in the socket list.
NEW QUESTION # 81
A Linux administrator prepares a backup script named testBack.sh. The backup script must be executed at 3:00 p.m. every Sunday. Which of the following crontabconfigurations will satisfy this requirement?
Answer: A
Explanation:
This cron entry schedules the script to run at minute zero of hour fifteen every Sunday, which corresponds to 3:00 p.m. each week.
NEW QUESTION # 82
After system startup, the X Window System GUI login interface is not displaying. Which of the following commands ensures that the GUI is started during the system startup process?
Answer: B
Explanation:
Setting the default target to graphical.targettells systemd to boot into the graphical interface on startup. The command systemctl set-default graphical.targetmakes the GUI login display automatically at boot.
NEW QUESTION # 83
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: C
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 # 84
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