CompTIA Linux+ — Practice Questions and Mock Exam

CompTIA Linux+ (XK0-006) validates the skills required to configure, manage, operate, and troubleshoot Linux environments. As a vendor-neutral certification, it covers enterprise Linux administration across distributions including Red Hat, Ubuntu, SUSE, and others, making it applicable to any Linux-based infrastructure.

The certification focuses on five core domains: system management, services and user administration, security hardening, automation and scripting, and troubleshooting. It is designed for IT professionals with at least 12 months of hands-on Linux experience and serves as a foundation for roles in system administration, DevOps, cloud infrastructure, and cybersecurity.

System Management leads at 23%, covering how a system boots, how its filesystem is laid out, storage via LVM and RAID, and setting up networking at the command line. Troubleshooting follows closely at 22%, then Services and User Management at 20%, Security at 18%, and Automation, Orchestration, and Scripting at 17% — the five domains sit within six points of each other, closer than most CompTIA exams.

That flat distribution means no domain can be treated as filler. Automation carries the smallest share, but its content (Ansible, container orchestration, shell or Python scripting) increasingly overlaps with what the other four domains test in practice, since modern Linux administration rarely separates configuration from the scripts that apply it.

The exam contains a maximum of 90 questions combining multiple-choice and performance-based question types. Performance-based questions test hands-on skills by presenting scenarios requiring command-line input, configuration file editing, or troubleshooting workflows. The exam duration is 90 minutes, and the passing score is 720 on a scale of 100 to 900.

Every domain of the COMPTIA-LINUX exam has enough questions in the pool to practice it in depth. A mock exam asks 90 questions in one sitting, on the same 90-minute clock as the real thing.

How long you'll need depends on how much hands-on experience you bring. The rest is set by the vendor: how the exam is delivered, how soon you can retake it, and how long the credential stays valid.

CompTIA Linux+ is delivered through Pearson VUE at authorized testing centers or via online proctoring, in English. The certification holds for three years and renews with 60 CE units, by passing the current version of the exam, or by earning a higher-level CompTIA certification. Linux+ is accredited by ANSI under ISO/IEC 17024, the international standard for personnel certification.

Package management commands vary by distribution and get tested across all of them (apt and dpkg for Debian-based systems, dnf and rpm for Red Hat, zypper for SUSE), so single-distro practice leaves gaps. systemd unit file directives (ExecStart versus ExecStartPre), LVM terminology (physical volumes, volume groups, logical volumes) and the order of operations for extending them, and SELinux context labels versus AppArmor profiles are common sources of confusion because the concepts overlap without being interchangeable. Firewall questions span iptables, nftables, and firewalld, three tools with overlapping functionality and different syntax for the same rule. Bash scripting questions test quoting and exit-code edge cases rather than basic syntax, and troubleshooting questions reward reading log output and correlating error messages over memorizing commands in isolation.