CompTIA Linux+ (XK0-006) — Study Guide
Free, topic-by-topic study notes for the CompTIA Linux+ (XK0-006) exam. Read a chapter, then practice it.
System Management
System management is the largest domain of the XK0-006 exam and covers how a Linux system is organized, installed, and maintained day to day. You will need fluency with the filesystem hierarchy, package managers, systemd, and storage. Mastery here underpins nearly every other task an administrator performs.
Troubleshooting
Troubleshooting tests your ability to diagnose problems methodically across processes, storage, networking, and performance. The exam expects you to gather evidence from logs and live tools before making changes. A structured approach turns confusing symptoms into identifiable root causes.
Services & User Management
This domain covers managing the accounts, groups, and network services that make a system usable and secure. You will configure who can log in, what privileges they hold, and how services are exposed. Correct account and service hygiene prevents both outages and breaches.
Security
The security domain focuses on hardening a Linux system against unauthorized access and privilege abuse. Topics span file permissions, mandatory access control, firewalls, and secure remote access. Defense in depth combines many small controls into a resilient whole.
Automation, Orchestration & Scripting
This domain covers automating repetitive work with shell scripts, scheduled jobs, version control, containers, and orchestration tools. Automation reduces human error and scales administration across many systems. Modern Linux roles increasingly expect infrastructure-as-code fluency.
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