Linux+ Tests Applied Linux Administration — Command Syntax and Troubleshooting Under Pressure
The exam tests whether you can administer Linux systems in production: file permissions, process management, networking, scripting, and security hardening.
Check Your Readiness →Most candidates understand CompTIA Linux+ concepts — and still fail. This exam tests how you apply knowledge under pressure.
Linux+ (XK0-005) has five domains. Questions test knowledge of specific commands, file system concepts, and troubleshooting approaches. Know the key commands for each domain cold — exam scenarios require precise command and option knowledge.
Manually start the service each time
Use systemctl enable to create the symlink for automatic start at boot — systemctl start only starts it for the current session; enable persists across reboots
Use chmod 777 to open all permissions on the file
Diagnose the actual permission issue: check file permissions (ls -l), check directory execute permission, check ACLs (getfacl), check if SELinux is blocking access — chmod 777 is an inappropriate security response
Check whether the service that cron controls is running
Verify cron syntax (crontab -l), check cron daemon status (systemctl status cron/crond), check /var/log/cron for execution errors, verify the user executing the cron job has required permissions
chmod 755 = rwxr-xr-x; chmod 644 = rw-r--r--. The owner/group/other permission structure (rwx = 4+2+1) must be internalized for both reading and writing the notation.
systemctl start/stop/restart for runtime control; systemctl enable/disable for boot persistence; systemctl status for current state. Candidates who use start when enable is required fail service management questions.
Hard links point to the same inode — deleting the original doesn't remove the data. Symbolic links point to the file path — if the original is deleted, the symlink breaks. ln for hard links; ln -s for symlinks.
Enforcing mode: violations denied and logged. Permissive mode: violations logged but not blocked (for troubleshooting). Disabled. Using Permissive mode permanently in production is a security misconfiguration.
Key log files: /var/log/syslog or /var/log/messages for system logs, /var/log/auth.log for authentication, journalctl for systemd logs. Candidates who don't know where to look for logs fail troubleshooting scenarios.
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Linux+ tests applied Linux administration. Test whether you can administer and troubleshoot Linux in production.