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Our CompTIA Linux+ Certification Exam (XK0-006) practice exam simulator mirrors the CompTIA Linux+ Certification Exam (XK0-006) exam experience, so you know what to anticipate on CompTIA Linux+ Certification Exam (XK0-006) certification exam day. Our CompTIA Linux+ Certification Exam (XK0-006) practice test software features various question styles and levels, so you can customize your CompTIA XK0-006 exam questions preparation to meet your needs.
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NEW QUESTION # 36
To perform a live migration, which of the following must match on both host servers? (Choose two).
Answer: A,D
Explanation:
CPU architecture must match because live migration requires CPU compatibility to continue running the virtual machine without errors.
Disk storage path must match so the migrated VM can access its virtual disks seamlessly on the destination host.
NEW QUESTION # 37
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 # 38
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: B
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 # 39
Users cannot access an application that is running inside containers. The administrator wants to validate whether the containers are running. Which of the following commands should the administrator use?
Answer: B
Explanation:
Container troubleshooting is a key competency within the Automation, Orchestration, and Scripting domain of CompTIA Linux+ V8. When users report that an application running inside containers is not accessible, one of the first validation steps is to confirm whether the containers are currently running.
The docker ps command is specifically designed to list running containers on the system. By default, it displays container IDs, image names, command executed, uptime, port mappings, and container names. This allows administrators to quickly determine whether the application container is active and whether it is exposing the expected ports. This aligns directly with Linux+ V8 guidance on container lifecycle management and operational validation.
The other options are not suitable for this purpose. docker start is used to start one or more stopped containers but does not display container status. docker run creates and starts a new container, which is not appropriate when the goal is only to check the status of existing containers. docker images lists locally available container images but provides no information about running or stopped containers.
Linux+ V8 documentation emphasizes the importance of using the correct Docker subcommands when diagnosing containerized applications. Verifying container runtime state using docker ps is a foundational troubleshooting step before investigating networking, firewall rules, or application-level errors.
Therefore, the correct command to validate whether containers are running is docker ps, making Answer B correct.
NEW QUESTION # 40
A Linux systems administrator needs to extract the contents of a file named /home/dev/web.bkp to the /var
/www/html/ directory. Which of the following commands should the administrator use?
Answer: B
Explanation:
File extraction and backup restoration are fundamental System Management tasks covered in CompTIA Linux+ V8. In this scenario, the administrator must extract the contents of an existing backup file into a target directory.
The correct command is option B, which uses cpio in extract mode. The command changes into the destination directory (/var/www/html/) using pushd, extracts the archive contents with cpio -idv, and then returns to the original directory with popd. This ensures that files are restored into the correct location without modifying paths inside the archive.
The cpio utility is commonly used for backups created with cpio -o and supports reading archive data from standard input. Linux+ V8 documentation includes cpio as a valid and supported archive format for backup and restore operations.
The other options are incorrect. Option A incorrectly assumes the backup is a gzip-compressed tar archive.
Option C creates a new archive instead of extracting one. Option D assumes the file is a ZIP archive, which is not indicated by the .bkp extension.
Linux+ V8 emphasizes using the correct tool based on the archive format and restoring files into the intended directory. Therefore, the correct answer is B.
NEW QUESTION # 41
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