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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Exam Format: | Multiple-choice, Performance-based |
| Related Certifications: | CompTIA Linux+ |
| Available Languages: | English |
| Passing Score: | 720 (on a scale of 100–900) |
| Exam Duration: | 90 minutes |
| Exam Price: | USD 348 |
| Real Exam Qty: | Maximum of 90 |
| Certificate Validity Period: | 3 years |
| Sample Questions: | CompTIA XK0-006 Sample Questions |
| Exam Way: | Online (via Pearson VUE) or In-person at Pearson VUE testing centers |
| Pre Condition: | No formal prerequisites; recommended 12 months of hands-on experience with Linux administration |
| Official Syllabus URL: | https://www.comptia.org/en-us/certifications/linux |
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NEW QUESTION # 203
An administrator receives reports that a web service is not responding. The administrator reviews the following outputs:
Which of the following is the reason the web service is not responding?
Answer: D
Explanation:
This issue falls under the Troubleshooting domain of the CompTIA Linux+ V8 objectives, specifically service startup failures and certificate-related errors. The provided output clearly indicates that the NGINX service fails during startup due to an inability to locate the private key file.
The critical error message is:
cannot load certificate key "/etc/pki/nginx/private/server.key": No such file or directory This message confirms that NGINX is explicitly configured to look for the private key in the directory /etc/pki
/nginx/private/. However, the directory listing shows that the private directory exists but is empty, while the server.key file is located in /etc/pki/nginx/ instead. Because NGINX cannot find the private key at the configured path, the configuration test (nginx -t) fails, and systemd prevents the service from starting.
Option C correctly identifies the root cause: the private key is not in the correct location. Moving server.key into /etc/pki/nginx/private/ (or updating the NGINX configuration to match the current location) would resolve the issue. Linux+ V8 documentation stresses that service failures often result from misaligned configuration paths rather than corrupted files.
The other options are incorrect. Option A incorrectly refers to renaming a certificate file and does not address the path issue. Option B suggests a key mismatch, which would generate a different SSL error rather than a
"file not found" error. Option D is also incorrect because private keys should not have executable permissions like 0755; typically, they are restricted (for example, 0600) for security reasons.
Therefore, the web service is not responding because the private key file is not located in the directory expected by the NGINX configuration. The correct answer is C.
NEW QUESTION # 204
An administrator needs to create a new logical volume from sets of provisioned disks. Which of the following shows the correct order of commands the administrator should execute?
Answer: D
Explanation:
Logical Volume Management (LVM) is a fundamental storage management concept in CompTIA Linux+ V8. LVM provides a layered abstraction between physical storage devices and the filesystems used by the operating system. To successfully provision a new logical volume, an administrator must follow a strict hierarchy of operations:
pvcreate (Physical Volume): This is the first step. The administrator must initialize the raw physical disks or partitions for use by LVM. This command writes LVM metadata to the disk, making it a "Physical Volume" (PV).
vgcreate (Volume Group): In the second step, the administrator combines one or more Physical Volumes into a single storage pool called a "Volume Group" (VG). The VG acts like a virtual disk drive created from the combined capacity of the underlying PVs.
lvcreate (Logical Volume): Finally, the administrator carves out space from the Volume Group to create "Logical Volumes" (LV). These LVs act like partitions and are where the administrator will actually create a filesystem (e.g., mkfs.ext4) and mount it for use.
This order is mandatory because each layer depends on the existence of the one below it. You cannot create a VG without PVs, and you cannot create an LV without a VG.
Therefore, the sequence pvcreate -> vgcreate -> lvcreate is the verified and only correct order of execution.
NEW QUESTION # 205
A user reports recurrent issues with an application, which is currently operational. The systems administrator gathers the following outputs to diagnose the issue:
Out of memory: Kill process (mariadb)
Killed process (mariadb)
mariadb invoked oom-killer
egrep ' Out of memory ' /var/log/messages
Multiple entries showing mariadb being killed by OOM killer
free -m
Mem: total 15819, used 10026, free 5174, available 5134
Swap: 0 0 0
sar -r
kbmemused ~67%, no swap usage
Which of the following is a possible cause of this issue?
Answer: C
Explanation:
The correct answer is D. The process is showing signs of a memory leak because the logs clearly indicate repeated activation of the OOM (Out Of Memory) killer, specifically targeting the mariadb process. The OOM killer is triggered when the Linux kernel determines that the system is running critically low on memory and must terminate processes to maintain system stability.
The repeated log entries showing mariadb invoked oom-killer and multiple instances of the process being killed strongly suggest that this application is consuming increasing amounts of memory over time without releasing it properly. This is a classic symptom of a memory leak, where an application continuously allocates memory but fails to free it, eventually exhausting available system resources.
The free -m output shows that while there is still some free memory, swap space is completely unused (0 total). This means the system has no fallback memory, making it more susceptible to OOM conditions.
However, the absence of swap alone does not explain why a specific process is repeatedly being killed.
Option A is incorrect because there is no indication of a backup process consuming memory. Option B is incorrect because the system is not using swap at all. Option C is incorrect because cached memory is reclaimable by the kernel and does not typically trigger the OOM killer.
From a Linux+ troubleshooting perspective, identifying repeated OOM events tied to a specific process is a strong indicator of inefficient memory handling or a memory leak. Administrators should investigate the application, apply updates or patches, or restart the service periodically while implementing proper monitoring and possibly adding swap space as a temporary mitigation.
NEW QUESTION # 206
A Linux administrator is configuring a CUPS print service on a Linux machine and needs to allow only connections from a local network. Which of the following commands should the administrator use?
Answer: C
Explanation:
Allowing access to the CUPS service requires permitting incoming TCP connections to port 631 from the local network. Adding an INPUT rule with the source network and destination port 631 ensures only hosts on that subnet can connect to the print service.
NEW QUESTION # 207
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: C
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.
NEW QUESTION # 208
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