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| Section | Weight | Objectives |
|---|---|---|
| Security | 18% | - System hardening and compliance
|
| Services and User Management | 20% | - Service configuration and operation
|
| System Management | 23% | - Installation, configuration, and maintenance
|
| Automation and Scripting | 17% | - Containers, orchestration, and cloud integration
|
| Troubleshooting | 22% | - System and hardware issues
|
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NEW QUESTION # 64
To perform a live migration, which of the following must match on both host servers? (Choose two)
Answer: C,F
Explanation:
Live migration is a virtualization feature that allows a running virtual machine to be moved from one host to another with minimal or no downtime. This topic falls under System Management in the CompTIA Linux+ V8 objectives, particularly in the areas of virtualization and resource management.
For a live migration to succeed, the CPU architecture must match between the source and destination hosts.
This is critical because the running virtual machine's CPU state, instruction set, and registers must be compatible with the destination system. Migrating between different CPU architectures (for example, x86_64 to ARM) is not supported and would cause the virtual machine to fail. Therefore, option D is required.
Additionally, the destination host must have sufficient available memory to accommodate the virtual machine being migrated. During live migration, the memory contents of the running VM are copied from the source host to the destination host while the VM continues to run. If enough memory is not available, the migration cannot complete successfully. This makes option E mandatory.
The other options are not strict requirements. USB ports do not need to match for live migration. Network speed may affect migration performance but does not need to be identical. Available swap space is not directly required for migration. Disk storage paths do not need to match as long as shared storage or compatible storage access is available.
Linux+ V8 documentation emphasizes CPU compatibility and memory availability as core prerequisites for live migration. Therefore, the correct answers are D and E.
NEW QUESTION # 65
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: D
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 # 66
A systems administrator is developing a script to copy a file if it exists and return an error if it does not. Given the following incomplete script:
Which of the following statements is missing from the script?
Answer: C
Explanation:
An else statement is required to handle the condition when the file does not exist so the script can return the error message instead of attempting the copy operation.
NEW QUESTION # 67
Users report that a Linux system is unresponsive and simple commands take too long to complete. The Linux administrator logs in to the system and sees the following: Output 1:
10:06:29 up 235 day, 19:23, 2 users, load average: 8.71, 8.24, 7.71
Which of the following is the system experiencing?
Answer: D
Explanation:
This scenario is a classic performance troubleshooting case covered under the Troubleshooting domain of the CompTIA Linux+ V8 objectives. The key indicators to analyze are the load average values and the CPU utilization statistics.
The uptime command shows load averages of 8.71, 8.24, and 7.71 over the 1-, 5-, and 15-minute intervals.
Load average represents the average number of processes that are either running on the CPU or waiting to run. On a system with 4 CPU cores, a healthy load average would typically be close to or below 4. Load averages consistently near or above 8 indicate that there are significantly more runnable processes than available CPU resources, causing processes to wait and resulting in poor system responsiveness.
The CPU output further confirms this condition. The %idle value is 0, meaning the CPU has no idle time available. The majority of CPU time is spent in user space (65.88%) and system/kernel space (20.54%), indicating heavy computational and kernel activity. While %iowait is present at 5.65%, it is not high enough to suggest that disk I/O is the primary bottleneck.
Option C, high CPU load, best explains the symptoms. High CPU load causes commands to execute slowly because processes are competing for limited CPU time. This directly matches the observed behavior of the system being unresponsive.
The other options are incorrect. High uptime simply indicates how long the system has been running and does not cause performance issues by itself. High latency is a general term and not a specific diagnosis shown by the metrics provided. High I/O wait times would require a significantly higher %iowait value.
According to Linux+ V8 documentation, correlating load averages with CPU core count and utilization is essential for accurate performance diagnosis. Therefore, the correct answer is C. High CPU load.
NEW QUESTION # 68
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: D
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 # 69
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