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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Available Languages: | English |
| Real Exam Qty: | Up to 90 |
| Passing Score: | 720 (scale 100โ900) |
| Certificate Validity Period: | 3 years |
| Exam Format: | Performance-based questions, Multiple-choice |
| Related Certifications: | CompTIA Network+ CompTIA A+ CompTIA Server+ |
| Exam Price: | $358 USD |
| Exam Duration: | 90 minutes |
| Recommended Training: | CompTIA Official Study Materials CompTIA CertMaster Learn |
| 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 # 161
A Linux server is not starting up because files in the /boot/partition are corrupt. After the initial GRUB screen, the following message is displayed:
Probing EDD (edd=off to disable)... ok
uncompression error
--system halted
Which of the following steps should the Linux administrator take to recover the system without destroying the existing installation? (Choose two.)
Answer: B,C
Explanation:
Using rescue boot media lets you boot the machine, mount the existing partitions, and access the corrupted /boot files without reinstalling the OS.
Reinstalling the kernel packages restores the missing or corrupt files in /boot (e.g., vmlinuz and initramfs), allowing GRUB to load and uncompress the kernel properly.
NEW QUESTION # 162
Which of the following commands can be used to display current CPU utilization in real time on a Linux system?
Answer: A
Explanation:
The correct answer is B. top because it provides a real-time, continuously updating view of system performance, including CPU utilization. The top command is one of the most widely used monitoring tools in Linux and is essential for system administrators when analyzing performance issues.
When executed, top displays a dynamic interface showing CPU usage percentages, memory consumption, load averages, running processes, and other critical system metrics. The CPU usage section is particularly useful because it breaks down usage into categories such as user space, system (kernel), idle time, and I/O wait. This allows administrators to quickly identify whether the CPU is under heavy load and which processes are consuming the most resources.
Option A (uptime) is incorrect because it provides load averages but does not give detailed or real-time CPU utilization percentages.
Option C (df) is incorrect because it reports disk space usage, not CPU activity.
Option D (lsblk) is incorrect because it lists block devices and storage structure, not CPU performance.
From a Linux+ system management perspective, tools like top, htop, and vmstat are critical for monitoring system health. Among these, top is the most fundamental and widely available tool for real-time CPU analysis. It enables administrators to detect performance bottlenecks, identify runaway processes, and take corrective action such as terminating processes or reallocating resources.
NEW QUESTION # 163
Which of the following commands should an administrator run to check for errors during startup?
Answer: C
Explanation:
The correct answer is B. dmesg because it displays the kernel ring buffer, which contains messages generated during system boot and runtime. These messages include hardware initialization details, driver loading status, and error or warning messages that occur during startup. This makes dmesg one of the most important tools for troubleshooting boot-related issues in Linux.
When a Linux system boots, the kernel initializes hardware components and loads drivers. Any issues encountered during this process-such as missing drivers, hardware failures, or misconfigurations-are logged in the kernel ring buffer. By running dmesg, administrators can review these messages and identify the root cause of startup problems. It is common to combine dmesg with tools like grep (e.g., dmesg | grep -i error) to filter relevant error messages.
Option A (modinfo) is incorrect because it provides information about kernel modules, such as version and dependencies, but does not display boot errors.
Option C (dracut) is incorrect because it is used to create or regenerate initramfs images, not to check system logs or startup errors.
Option D (lshw) is incorrect because it lists detailed hardware information but does not show boot-time errors or logs.
From a Linux+ troubleshooting perspective, analyzing boot logs is critical for diagnosing system issues. The dmesg command provides immediate access to kernel-level messages, making it an essential tool for identifying hardware and driver-related problems that occur during system startup.
NEW QUESTION # 164
The security manager at a company notifies a systems administrator of open vulnerabilities on the Linux system. The administrator receives the following information while logged in to the server:
Which of the following is the most likely security concern?
Answer: D
Explanation:
The package management history shows that the last system update occurred over a year ago, which strongly indicates that security patches and vulnerability fixes have not been applied, leaving the system exposed to known vulnerabilities.
NEW QUESTION # 165
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?
Answer: B
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 166
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