Covering all 4 domains

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The CompTIA Linux+ certification covers several domains or objectives that candidates are tested on. 

1) System Configuration and Management:

• Compare and contrast Linux graphical user interfaces and command-line interfaces.
• Evaluate and configure hardware settings.
• Boot the system.

2) System Operation and Maintenance:

• Determine and configure appropriate system properties.
• Schedule jobs and manage priorities of tasks in the Linux system.
• Monitor systems for vital characteristics and processes.

3) Security:

• Apply and configure appropriate security settings.
• Conduct security audits.
• Implement host security.
• Implement data security.

4) Linux Troubleshooting and Diagnostics:

• Analyze system properties and remediate issues.
• Troubleshoot user issues.
• Troubleshoot application and hardware issues.
• Troubleshoot kernel modules and networking issues.

It's important to note that certification exams and their objectives can be updated over time, so it's recommended to check the official CompTIA website or other reliable sources for the most current information on the Linux+ certification domains and objectives.