Free CompTIA Linux+ Practice Test 2026
Master Linux administration with our XK0-005 practice questions. Covering system management, security, containers, automation, and troubleshooting—the core skills needed for modern Linux environments and DevOps roles.
Linux+ XK0-005 Exam Quick Facts
| Exam Code | XK0-005 |
| Full Name | CompTIA Linux+ |
| Number of Questions | Up to 90 (MCQ + PBQ) |
| Exam Duration | 90 minutes |
| Passing Score | 720 (on 100-900 scale) |
| Exam Cost | $358 USD |
| Validity Period | 3 years |
| Renewal | 30 CEUs or higher cert |
| Prerequisites | None (A+ and 12 months experience recommended) |
| DoD 8570 | Yes - IAT Level I |
| Average Salary | $82,000/year (Linux Admin) |
Linux+ XK0-005 Exam Domains
The Linux+ exam tests four core domains. XK0-005 significantly increased container and automation content compared to the previous version.
⚙️ System Management (32%)
Topics: Package management (apt, dnf, zypper), storage configuration (LVM, RAID, filesystems), process management, systemd services, kernel modules, scheduling (cron, at).
Key Commands: systemctl, journalctl, lsblk, fdisk, mount, crontab
🔒 Security (21%)
Topics: User/group management, file permissions (chmod, chown, ACLs), SELinux/AppArmor, firewall configuration (firewalld, iptables, nftables), SSH hardening, PAM.
Key Commands: useradd, chmod, setfacl, getenforce, firewall-cmd
📦 Scripting, Containers & Automation (19%)
Topics: Bash scripting, Git version control, Docker/Podman containers, container orchestration basics, infrastructure as code concepts, CI/CD pipelines.
Key Commands: docker/podman, git, bash scripting, grep, awk, sed
🔧 Troubleshooting (28%)
Topics: Boot process issues, network troubleshooting, storage problems, performance tuning, log analysis, CPU/memory/disk diagnostics.
Key Commands: dmesg, top/htop, netstat/ss, df, du, free, vmstat
Ready to Master Linux Administration?
Practice with questions designed by Linux professionals covering all XK0-005 domains.
Start Practice Test →Essential Linux Commands for XK0-005
The Linux+ exam tests your knowledge of exact command syntax. Here are critical commands organized by domain.
📦 Package Management
# Debian/Ubuntu apt update && apt upgrade apt install package_name dpkg -l | grep package # RHEL/CentOS/Fedora dnf check-update dnf install package_name rpm -qa | grep package
⚙️ Systemd Services
systemctl status sshd systemctl enable --now nginx systemctl restart httpd journalctl -u sshd -f systemctl list-units --failed
💾 Storage & LVM
lsblk -f fdisk /dev/sdb pvcreate /dev/sdb1 vgcreate vg01 /dev/sdb1 lvcreate -L 10G -n lv01 vg01 mkfs.xfs /dev/vg01/lv01
🔐 Permissions & ACLs
chmod 755 script.sh chown user:group file setfacl -m u:user:rwx file getfacl file chattr +i immutable_file
🐳 Container Commands
docker pull nginx:latest docker run -d -p 80:80 nginx docker ps -a docker exec -it container bash podman build -t myapp .
🔍 Troubleshooting
top -bn1 | head -20 free -h df -h ss -tulnp journalctl -p err --since today
Sample Linux+ Practice Question
Question: A Linux administrator needs to create a new logical volume named "data" with 20GB of space from an existing volume group called "vg_storage". Which command should be used?
A) vgcreate -L 20G -n data vg_storage
B) lvcreate -L 20G -n data vg_storage
C) lvextend -L 20G vg_storage/data
D) pvcreate -L 20G -n data vg_storage
Show Answer
✓ B) lvcreate -L 20G -n data vg_storage
The lvcreate command creates logical volumes from existing volume groups. The -L flag specifies size, -n specifies the name, and the last argument is the volume group. vgcreate creates volume groups, lvextend extends existing LVs, and pvcreate creates physical volumes.
Linux+ vs RHCSA: Which to Choose?
| Aspect | CompTIA Linux+ | Red Hat RHCSA |
|---|---|---|
| Vendor | CompTIA (vendor-neutral) | Red Hat (vendor-specific) |
| Exam Format | MCQ + Performance-based | 100% hands-on practical |
| Duration | 90 minutes | 3 hours |
| Difficulty | Intermediate | Intermediate-Advanced |
| Cost | $358 | $450 |
| Best For | Multi-distro environments, DoD | RHEL/CentOS shops, enterprise |
| Containers | Docker and Podman | Podman focus |
| Next Step | Cloud+, DevOps certs | RHCE (Ansible automation) |
Updated for XK0-005
Questions aligned with the latest Linux+ exam objectives covering containers, Git, and cloud deployment.
Hands-On Focus
Practice command-line scenarios that mirror real exam performance-based questions.
DoD 8570 Approved
Linux+ is approved for IAT Level I positions, valuable for government and defense contractor roles.
Vendor-Neutral Skills
Learn skills applicable to any Linux distribution—Ubuntu, RHEL, CentOS, Debian, SUSE, and more.
Career Opportunities with Linux+
According to PrepForCerts analysis, Linux+ certification qualifies you for diverse IT roles:
🖥️ Linux System Administrator
Salary: $70,000 - $110,000
Manage Linux servers, automate tasks, ensure uptime, and implement security patches across enterprise environments.
☁️ DevOps Engineer
Salary: $95,000 - $150,000
Linux+ provides the foundation. Add Docker, Kubernetes, and CI/CD skills to transition into high-demand DevOps roles.
🔐 Security Administrator
Salary: $75,000 - $115,000
Linux security knowledge (SELinux, firewalls, hardening) is essential for security roles protecting enterprise infrastructure.
🏢 Cloud Engineer
Salary: $100,000 - $140,000
Most cloud workloads run on Linux. Combine Linux+ with AWS/Azure/GCP certifications for cloud architecture roles.
Frequently Asked Questions
What is the Linux+ exam format?
The Linux+ exam (XK0-005) has up to 90 questions including multiple-choice and performance-based questions. You have 90 minutes to complete it. The passing score is 720 on a scale of 100-900. PBQs typically appear at the beginning of the exam.
What are the prerequisites for Linux+?
There are no mandatory prerequisites, but CompTIA recommends A+ certification and 12+ months of hands-on Linux administration experience. You should be comfortable with the command line before attempting this exam.
What domains does Linux+ XK0-005 cover?
Linux+ covers four domains: System Management (32%), Security (21%), Scripting, Containers and Automation (19%), and Troubleshooting (28%). XK0-005 added significant container (Docker/Podman) and Git content compared to the previous version.
How does Linux+ compare to RHCSA?
Linux+ is vendor-neutral with multiple-choice and performance-based questions, covering general Linux knowledge applicable to any distribution. RHCSA is Red Hat-specific and 100% hands-on performance-based. RHCSA is generally considered harder but more specialized to Red Hat environments.
How much does Linux+ cost?
The Linux+ exam costs $358 USD. Unlike CompTIA A+ which requires two exams, Linux+ is a single exam. Total preparation cost including study materials typically ranges from $450-$850.
How long is Linux+ certification valid?
Linux+ certification is valid for 3 years. You can renew through CompTIA's Continuing Education program by earning 30 CEUs or passing a higher-level certification like CASP+ or Cloud+.
Is Linux+ DoD approved?
Yes, Linux+ is approved for DoD 8570 compliance at the IAT Level I position. This makes it valuable for government and defense contractor positions requiring verified Linux administration skills.
What's new in XK0-005?
XK0-005 added significant content on containers (Docker, Podman), Git version control, cloud deployment concepts, automation with Ansible basics, and container orchestration. It reduced coverage of legacy topics and older init systems.