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問題 #15
A Linux administrator is creating a symbolic link /home/docsleading to the
/usr/share/documents/directory. Which of the following commands allows the administrator to achieve this goal?
答案：A
解題說明：
This command creates a symbolic link at the specified path that points to the target directory, allowing access to the target through the new link location.
問題 #16
A Linux administrator receives reports that an application hosted in a system is not completing tasks in the allocated time. The administrator connects to the system and obtains the following details:
Which of the following actions can the administrator take to help speed up the jobs?
答案：A
解題說明：
This scenario represents a classic CPU-bound performance issue, which is covered under the Troubleshooting domain of CompTIA Linux+ V8. The most important indicator is the load average compared to the number of available CPU cores.
The system has 4 CPU cores, as shown by nproc, but the load averages are consistently above 5, with a peak of 7.75. Load average reflects the number of processes either actively running on the CPU or waiting for CPU time. When the load average exceeds the number of CPU cores for extended periods, it indicates CPU contention. Processes must wait longer to be scheduled, resulting in delayed task completion.
The memory statistics confirm that memory is not the bottleneck. free -h shows over 3.5 GiB of available memory, and swap usage is minimal. Additionally, vmstat shows no significant swap-in or swap-out activity and low I/O wait, ruling out memory pressure and disk bottlenecks.
Increasing swap space would not help because the system is not memory constrained. Adding more disks would not address CPU scheduling delays. Increasing free memory is unnecessary because sufficient memory is already available.
Linux+ V8 documentation emphasizes correlating load average with CPU core count to diagnose CPU saturation. The most effective way to speed up job execution in this case is to increase CPU resources, such as adding more vCPUs, moving the workload to a more powerful system, or distributing the workload across multiple systems.
Therefore, the correct answer is B. Increase the amount of CPU resources available to the system.
問題 #17
Which of the following utilities supports the automation of security compliance and vulnerability management?
答案：D
解題說明：
Security compliance and vulnerability management are critical components of Linux system administration, and CompTIA Linux+ V8 places strong emphasis on automated security assessment tools. OpenSCAP is specifically designed to address these requirements.
OpenSCAP is an open-source framework that implements the Security Content Automation Protocol (SCAP), a set of standards used for automated vulnerability scanning, configuration compliance checking, and security auditing. It allows administrators to assess Linux systems against established security baselines such as CIS benchmarks, DISA STIGs, and organizational security policies. This makes OpenSCAP the most appropriate tool for automating both compliance and vulnerability management.
The other options serve different security-related purposes but do not fulfill the automation requirement.
SELinux is a mandatory access control system that enforces security policies at runtime but does not perform compliance scanning or vulnerability assessments. Nmap is a network scanning and discovery tool used to identify open ports and services, not compliance automation. AIDE (Advanced Intrusion Detection Environment) is a file integrity monitoring tool that detects unauthorized file changes but does not evaluate overall system compliance.
Linux+ V8 documentation highlights OpenSCAP as a tool used to automate security audits, generate compliance reports, and integrate with configuration management workflows. Its ability to standardize security checks across multiple systems makes it essential in enterprise and regulated environments.
Therefore, the correct answer is D. OpenSCAP.
問題 #18
An administrator attempts to install updates on a Linux system but receives error messages regarding a specific repository. Which of the following commands should the administrator use to verify that the repository is installed and enabled?
答案：C
解題說明：
Package management troubleshooting is an important skill in Linux+ V8, especially on RPM-based distributions that use yum or dnf. When update errors reference a repository, the administrator must verify whether the repository exists and whether it is enabled.
The command yum repolist all displays all configured repositories, including those that are enabled, disabled, or temporarily unavailable. This makes it the most effective command for diagnosing repository-related issues. It allows administrators to quickly confirm the repository's status and take corrective action, such as enabling it or fixing configuration errors.
The other options are incorrect. yum repo-pkgs manages packages within a repository but does not list repository status. yum list installed repos is not a valid yum command. yum reposync is used to mirror repositories locally and is not intended for verification.
Linux+ V8 documentation highlights yum repolist all as the standard command for repository inspection and troubleshooting.
Therefore, the correct answer is D. yum repolist all.
問題 #19
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?
答案：A
解題說明：
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.
Option A (Filesystem corruption) is incorrect because filesystem issues usually generate I/O errors or mount failures, not machine check exceptions.
Option C (Misconfigured bootloader) is incorrect because bootloader problems typically prevent the system from starting properly, rather than causing runtime kernel panics with hardware-related traces.
Option D (Incorrect file permissions) is incorrect because permission issues affect user access and application behavior, not kernel-level operations.
From a Linux+ troubleshooting perspective, kernel panics related to machine checks require hardware diagnostics. Administrators should inspect system logs (/var/log/messages, dmesg), run memory tests (e.g., memtest86+), check CPU health, and verify system cooling. Hardware replacement or firmware updates may be necessary to resolve the issue.
問題 #20
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