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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA Linux+ Certification Exam |
| Exam Number: | XK0-006 |
| Exam Format: | Performance-based questions, Multiple-choice |
| Passing Score: | 720 (scale 100โ900) |
| Available Languages: | English |
| Exam Price: | $358 USD |
| Exam Duration: | 90 minutes |
| Real Exam Qty: | Up to 90 |
| Related Certifications: | CompTIA Network+ CompTIA Server+ CompTIA A+ |
| Certificate Validity Period: | 3 years |
| 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 # 113
Which of the following filesystems contains non-persistent or volatile data?
Answer: A
Explanation:
Understanding Linux filesystems and their purposes is a fundamental system management skill outlined in the Linux+ V8 objectives. Among the listed options, /proc is the filesystem that contains non-persistent, volatile data.
The /proc filesystem is a virtual filesystem that exists entirely in memory and is dynamically generated by the Linux kernel. It does not store data on disk and does not persist across system reboots. Instead, /proc provides real-time information about running processes, kernel parameters, system memory, CPU statistics, and hardware state. Files within /proc represent kernel data structures and change constantly as the system operates.
The other filesystems contain persistent data stored on disk. /boot stores bootloader files and kernel images, which are critical for system startup. /usr contains user applications, libraries, and documentation, all of which are persistent. /var holds variable data such as logs, spool files, and caches, which may change frequently but are still stored persistently on disk.
Linux+ V8 documentation emphasizes that /proc is used primarily for system monitoring and tuning.
Administrators often interact with /proc to inspect process details or modify kernel parameters using tools like sysctl. Because its contents are generated at runtime and cleared on reboot, /proc is classified as non-persistent or volatile.
Therefore, the correct answer is C. /proc.
NEW QUESTION # 114
Which of the following Ansible components contains a list of hosts and host groups?
Answer: A
Explanation:
In Ansible, the inventory defines the list of managed nodes (hosts) and groups of hosts. It is the source from which Ansible knows what systems to configure or manage.
NEW QUESTION # 115
A Linux user needs to download the latest Debian image from a Docker repository. Which of the following commands makes this task possible?
Answer: A
Explanation:
The correct answer is B. docker image pull debian because it is the standard Docker command used to download container images from a remote repository such as Docker Hub. In Docker terminology, "pulling" an image means retrieving it from a remote registry and storing it locally so it can be used to create containers.
When a user executes docker image pull debian, Docker connects to the default registry (Docker Hub), searches for the official Debian image, and downloads the latest version (by default, the "latest" tag unless otherwise specified). This command is essential in container-based workflows and is commonly used in automation, orchestration, and DevOps environments.
Option A (docker image init debian) is incorrect because there is no valid Docker command called init under docker image. Initialization of containers is handled differently, typically via docker run.
Option C (docker image import debian) is incorrect because import is used to create a Docker image from a local tarball or file, not to download from a remote repository.
Option D (docker image save debian) is incorrect because save is used to export an existing local image into a tar archive for backup or transfer purposes. It does not download images.
From a Linux+ perspective, understanding container management is a key part of automation and orchestration. Commands like docker pull allow administrators to quickly provision environments, deploy applications, and maintain consistency across systems. This makes it a fundamental skill for modern Linux system administration and DevOps practices
NEW QUESTION # 116
Which of the following commands is used to verify whether a port is open on a remote host?
Answer: D
NEW QUESTION # 117
Application owners are reporting that their application stops responding after several days of running, and they need to restart it. A Linux administrator obtains the following details from the dmesg command:
invoked oom-killer
Call Trace:
out_of_memory
oom_kill_process
The application owners mentioned that resources to the system have been increased, and the error takes longer to appear. Which of the following best describes the reason the process is being terminated by OOM?
Answer: A
Explanation:
The correct answer is C. The application might have a memory leak because the dmesg output clearly shows that the Linux kernel is invoking the OOM (Out Of Memory) killer, which terminates processes when the system runs out of available memory. The presence of entries such as invoked oom-killer, out_of_memory, and oom_kill_process confirms that the system is exhausting its memory resources over time.
A key detail in the scenario is that the application runs for several days before failing, and when system resources (RAM) are increased, the issue takes longer to occur. This behavior is a classic indicator of a memory leak, where an application gradually consumes more memory without releasing it. Instead of stabilizing, memory usage continuously grows until it reaches the system limit, at which point the OOM killer terminates the process to prevent system instability.
Option A (CPU type is incompatible) is incorrect because CPU incompatibility would cause immediate execution failures, not delayed memory exhaustion. Option B (kernel panic) is incorrect because a kernel panic would crash the entire system, not selectively terminate a user-space process. Option D (swap configuration not correctly sized) is partially plausible but not the best answer; while insufficient swap can contribute to OOM conditions, it does not explain the gradual memory consumption pattern observed.
In Linux+ troubleshooting, identifying memory leaks is critical when dealing with long-running applications.
Administrators should monitor memory usage using tools like top, htop, or ps, and investigate application behavior. Applying patches, optimizing code, or restarting services periodically are common mitigation strategies, along with configuring appropriate memory and swap resources.
NEW QUESTION # 118
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