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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Services and User Management | 20% | - User and group administration
|
| Topic 2: Security | 18% | - System hardening and compliance
|
| Topic 3: Troubleshooting | 22% | - Network and service problems
|
| Topic 4: System Management | 23% | - Installation, configuration, and maintenance
|
| Topic 5: Automation and Scripting | 17% | - Shell scripting and automation
|
>> Valid CompTIA XK0-006 Exam Objectives <<
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NEW QUESTION # 11
A systems administrator is creating a backup copy of the /home/directory. Which of the following commands allows the administrator to archive and compress the directory at the same time?
Answer: D
Explanation:
The tar -cJf command creates (-c) an archive, compresses it with XZ (-J), and writes it to a file (- f). This allows archiving and compression of the /home/ directory in one step.
NEW QUESTION # 12
A Linux system displays the following error during operation:
Kernel panic - not syncing: Fatal Machine check
Pid: 0, comm: swapper Tainted: G M
Call Trace:
...
mce_panic
do_machine_check
Which of the following is the most likely cause of this issue?
Answer: B
Explanation:
The correct answer is B. Hardware failure (CPU or memory) because the error message explicitly references a
"Machine Check Exception (MCE)", which is a hardware-level error detected by the CPU. The line "Kernel panic - not syncing: Fatal Machine check" indicates that the kernel encountered a critical, unrecoverable hardware condition and halted the system to prevent further damage or data corruption.
Machine Check Exceptions are generated by the CPU when it detects internal errors such as cache failures, bus errors, or memory corruption. These errors are typically associated with faulty hardware components like the processor, RAM, motherboard, or even overheating issues. The presence of functions like mce_panic and do_machine_check in the call trace further confirms that the kernel is responding to a hardware-level fault.
Option A (Filesystem corruption) is incorrect because filesystem issues usually generate I/O errors or mount failures, not machine check exceptions.
Option C (Misconfigured bootloader) is incorrect because bootloader problems typically prevent the system from starting properly, rather than causing runtime kernel panics with hardware-related traces.
Option D (Incorrect file permissions) is incorrect because permission issues affect user access and application behavior, not kernel-level operations.
From a Linux+ troubleshooting perspective, kernel panics related to machine checks require hardware diagnostics. Administrators should inspect system logs (/var/log/messages, dmesg), run memory tests (e.g., memtest86+), check CPU health, and verify system cooling. Hardware replacement or firmware updates may be necessary to resolve the issue.
NEW QUESTION # 13
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 # 14
An administrator updates the network configuration on a server but wants to ensure the change will not cause an outage if something goes wrong. Which of the following commands allows the administrator to accomplish this goal?
Answer: A
Explanation:
netplan try applies the new network configuration temporarily and waits for user confirmation. If not confirmed, it automatically reverts, preventing outages from misconfigurations.
NEW QUESTION # 15
After receiving a monitoring call, an administrator checks the Linux server for processes that have completed execution but have not been removed yet from the process table.
Which of the following represents the process state for which the administrator should search?
Answer: D
Explanation:
This process state represents zombie processes, which have finished execution but still remain in the process table because their parent process has not yet read their exit status.
NEW QUESTION # 16
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