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| Section | Weight | Objectives |
|---|---|---|
| Troubleshooting | 28% | - Troubleshoot network connectivity (firewall, routing, DNS) - Troubleshoot application issues - Troubleshoot user issues - Troubleshoot hardware issues - Troubleshoot security issues (SELinux, permissions) - Optimize performance (CPU, memory, I/O) - Troubleshoot system properties and processes - Monitor system logs, health, and events |
| Security | 21% | - Configure SELinux and security contexts - Implement security hardening - Perform vulnerability assessments - Manage file security and access controls - Apply best practices for permissions and authentication - Manage firewalls |
| System Management | 32% | - Manage files and directories - Manage packages and software - Manage kernel modules - Manage permissions and ownership - Manage users and groups - Manage storage - Manage system components - Perform basic Linux tasks - Configure kernel modules and network parameters - Manage networking - Manage the Linux boot process - Configure storage and cloud/virtualization technologies - Manage devices |
| Scripting, Containers, and Automation | 19% | - Manage version control using Git - Automate administration with Python and configuration management tools - Implement automation workflows - Deploy and manage containers (Docker/Podman) - Write and execute BASH shell scripts - Manage orchestration processes |
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NEW QUESTION # 120
Which of the following is an example of responsible use of publicly available generative AI by a systems administrator?
Answer: B
Explanation:
Using anonymized data ensures that no sensitive or proprietary information is exposed while still allowing the administrator to benefit from generative AI for tasks such as creating regular expressions.
NEW QUESTION # 121
Which of the following commands can be used to display current CPU utilization in real time on a Linux system?
Answer: C
Explanation:
The correct answer is B. top because it provides a real-time, continuously updating view of system performance, including CPU utilization. The top command is one of the most widely used monitoring tools in Linux and is essential for system administrators when analyzing performance issues.
When executed, top displays a dynamic interface showing CPU usage percentages, memory consumption, load averages, running processes, and other critical system metrics. The CPU usage section is particularly useful because it breaks down usage into categories such as user space, system (kernel), idle time, and I/O wait. This allows administrators to quickly identify whether the CPU is under heavy load and which processes are consuming the most resources.
Option A (uptime) is incorrect because it provides load averages but does not give detailed or real-time CPU utilization percentages.
Option C (df) is incorrect because it reports disk space usage, not CPU activity.
Option D (lsblk) is incorrect because it lists block devices and storage structure, not CPU performance.
From a Linux+ system management perspective, tools like top, htop, and vmstat are critical for monitoring system health. Among these, top is the most fundamental and widely available tool for real-time CPU analysis. It enables administrators to detect performance bottlenecks, identify runaway processes, and take corrective action such as terminating processes or reallocating resources.
NEW QUESTION # 122
A systems administrator is decommissioning a service. Which of the following commands should the administrator use to make sure users cannot start the service again?
Answer: C
Explanation:
This command prevents the service from being started manually or automatically by linking it to a null target, ensuring it cannot be restarted even if another service or user attempts to start it.
NEW QUESTION # 123
Which of the following protocols is used to monitor network devices?
Answer: D
Explanation:
SNMP is used to monitor network devices by collecting status and performance information and allowing centralized management and alerting.
NEW QUESTION # 124
A Linux administrator just finished setting up passwordless SSH authentication between two nodes. However, upon test validation, the remote host prompts for a password. Given the following logs:
Which of the following is the most likely cause of the issue?
Answer: D
Explanation:
This issue is directly related to SELinux enforcement, which is a key topic in the Security domain of CompTIA Linux+ V8. The logs clearly indicate that SSH key-based authentication is failing due to an SELinux access control violation rather than a traditional file permission or SSH configuration problem.
The most important clue is the AVC denial message, which shows that the sshd process is being denied read access to the authorized_keys file. The security context of the file is listed as unconfined_u:object_r:
home_root_t:s0. Under a targeted SELinux policy, SSH is only permitted to read authorized_keys files that are labeled with the correct SELinux type, typically ssh_home_t.
Because SELinux is running in enforcing mode, it actively blocks access that violates policy rules, even if standard UNIX permissions are correct. Although the file permissions (600) are acceptable for an authorized_keys file, SELinux does not rely solely on traditional permissions. The mismatch between the expected SELinux context and the actual context prevents sshd from accessing the file, causing SSH to fall back to password authentication.
Option D correctly identifies the root cause: the authorized_keys file does not have the correct SELinux security context. This is a well-documented Linux+ V8 troubleshooting scenario, commonly resolved by restoring the correct context using commands such as restorecon or by ensuring the file resides in a properly labeled home directory.
The other options are incorrect. Restarting sshd does not fix SELinux labeling issues. The policy itself is functioning as intended, and file ownership alone does not override SELinux access controls.
Linux+ V8 documentation emphasizes that SELinux denials must be addressed by correcting file contexts rather than weakening security controls. Therefore, the correct answer is D.
NEW QUESTION # 125
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