Free XK0-004: CompTIA Linux Exam Questions and Answers
CompTIA Linux is exam XK0-004, part of the CompTIA certification programme. CompTIA exam codes carry a family prefix and a version number — SY0- for Security+, N10- for Network+, CS0- for CySA+, 220- for A+ — and most Plus-series exams allow 90 minutes for up to 90 questions, mixing multiple choice with performance-based items in a simulated environment.
The first 10 questions on this page are free to read, answers included — no account and no card. A plan opens the rest of the bank, the full timed practice test and your weak-topic reporting.
Last updated: September 20, 2026
- Exam code
- XK0-004
- Provider
- CompTIA
- Questions in our bank
- 1000+
- Free to read
- First 10, with answers
- Official page
- Official Exam website
- Our test mode duration & pass mark
- 130 mins · 70%
Recommended: Switch to Test Mode to start a practice test that simulates the real exam experience.
Question #1
A Linux administration is using a Linux system as a router. During the tests, the administrator discovers that IP packets are not being sent between the configured interfaces. Which of the following commands enables this feature for IPv4 networks?
Please select an optionIncorrectCorrect answer: B
IPv4 forwarding is toggled through the file /proc/sys/net/ipv4/ip_forward, so writing 1 into it lets the router pass packets between interfaces; ip_route and ip_net are not forwarding parameters.
Was this answer correct?Question #2
A Linux administrator is testing connectivity to a remote host on a shared terminal. The administrator wants to allow other users to access the terminal while the command is executing. Which of the following commands should the administrator use?
Please select an optionIncorrectCorrect answer: D
The ampersand launches ping as a background job and returns the prompt immediately, so other users can keep using the shared terminal. The bg and fg commands only manage jobs that already exist, and output redirection does not background a command.
Was this answer correct?Question #3
A systems administrator needs to append output of ls –lha /opt command to the contents of a test.txt file. Which of the following commands will accomplish this?
Please select an optionIncorrectCorrect answer: C
The >> operator appends command output to the existing file, whereas > overwrites it and < and << redirect input instead.
Was this answer correct?Question #4
A Linux administrator implemented a new HTTP server using the default configuration. None of the users on the network can access the server. If there is no problem on the network or with the users’ workstations, which of the following steps will BEST analyze and resolve the issue?
Please select an optionIncorrectCorrect answer: A
netstat reveals whether the HTTP server is actually bound to ports 80 and 443, and the host firewall must then accept inbound traffic on those ports. route only inspects routing tables, which cannot bind or reveal a service port.
Was this answer correct?Question #5
A Linux server needs to be accessed, but the root password is not available. Which of the following would BEST allow an administrator to regain access and set a new known password at the same time?
Please select an optionIncorrectCorrect answer: A
Booting into single-user mode gives a root shell without the password, and the passwd command then sets a new known one; hand-editing /etc/passwd or /etc/shadow risks a corrupted account entry.
Was this answer correct?Question #6
A Linux systems administrator is setting up SSH access with PKI for several using their newly created RSA keys. Which of the following MOST securely achieves this task?
Please select an optionIncorrectCorrect answer: C
ssh-copy-id installs each user's public key into the remote account with correct permissions, while the private key must never leave the user's own system.
Was this answer correct?Question #7
A junior Linux administrator is installing a new application with CPU architecture requirements that have the following specifications: x64 bit 3.0GHz speed Minimum quad core The administrator wants to leverage existing equipment but is unsure whether the requirements of these systems are adequate. The administrator issues the following command cat/proc/cpuinfo. The output of the command is as follows: Which of the following is the recommended course of action the administrator should take based on this output?
Please select an optionIncorrectCorrect answer: B
Was this answer correct?Question #8
A systems administrator wants to know the current status of a series of dd jobs that were started in the background three hours ago. Which of the following commands will achieve this task?
Please select an optionIncorrectCorrect answer: D
killall -USR1 dd sends SIGUSR1, which makes each dd process print its progress to the terminal, revealing the current status of the background jobs.
Was this answer correct?Question #9
Which of the following would be the BEST solution for a systems administrator to access the graphical user environment of a Linux machine remotely?
Please select an optionIncorrectCorrect answer: A
VNC shares the graphical desktop session over the network; KDE is only a desktop environment, X11 is the underlying display system and RPC is a remote procedure protocol.
Was this answer correct?Question #10
An administrator is attempting to block SSH connections to 192.168.10.24 using the Linux firewall. After implementing a rule, a connection refused error is displayed when attempting to SSH to 192.168.10.24. Which of the following rules was MOST likely implemented?
Please select an optionIncorrectCorrect answer: A
The REJECT target answers with a reset, which the client reports as connection refused, whereas DROP would silently time out; FORWARD and REFUSE are not valid targets here.
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Other CompTIA certifications
- SK0-004: CompTIA Server (opens in a new tab)
- SY0-701: CompTIA Security 2023 (opens in a new tab)
- N10-008: CompTIA Network (opens in a new tab)
- CS0-002: CompTIA CySA Certification Exam (CS0-002) (opens in a new tab)
- SY0-601: CompTIA Security 2021 (opens in a new tab)
- N10-009: CompTIA Network+ Exam (opens in a new tab)
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FAQ
Learn More: https://www.comptia.org/certifications
- Q1: What is the XK0-004: CompTIA Linux exam?
- A: XK0-004: CompTIA Linux is a CompTIA certification exam. Judging by the questions in our bank, it concentrates on linux, commands, terminal, repository and drive.
- Q2: What topics does the XK0-004: CompTIA Linux exam cover?
- A: Questions in our XK0-004: CompTIA Linux bank cluster around linux, commands, terminal, repository, drive, directory, accomplish and machine. Working through the full set is the quickest way to find which of these you are weakest on.
- Q3: How should I prepare for XK0-004: CompTIA Linux?
- A: Work through the XK0-004: CompTIA Linux practice questions here, checking your answer on each one, then sit the practice test to rehearse the exam under timed conditions before the real thing.
- Q4: Are these real XK0-004: CompTIA Linux exam questions?
- A: They are drawn from officially released past questions and from community members who have sat XK0-004: CompTIA Linux. Answers are verified and updated weekly.
- Q5: Where do I register for the XK0-004: CompTIA Linux exam?
- A: Register through CompTIA directly at https://www.comptia.org/certifications. Exampractice is not affiliated with CompTIA and does not administer the exam.
- Q6: Is there a free XK0-004: CompTIA Linux sample?
- A: Yes. Every XK0-004: CompTIA Linux page shows a free sample of real questions. Upgrading opens the full bank and the practice test.
- Q7: What are CompTIA Certification Exams?
- A: CompTIA Certification Exams validate your expertise in various IT disciplines, including networking, security, cloud computing, and IT support. These certifications demonstrate your proficiency in applying best practices and industry standards to manage and troubleshoot IT environments.
- Q8: Why should I pursue CompTIA Certification?
- A: CompTIA Certification enhances your professional credibility, showcasing your skills and knowledge in essential IT areas. This can lead to better job opportunities, higher salaries, and career advancement in IT support, networking, cybersecurity, and cloud computing fields.
- Q9: What are the benefits of CompTIA Certification?
- A: Benefits include recognition as a certified IT professional, improved job performance, access to exclusive resources, continuing education opportunities, and staying current with the latest IT industry trends and best practices.
- Q10: Who should take CompTIA Certification Exams?
- A: IT professionals, network administrators, cybersecurity experts, cloud engineers, and anyone involved in managing and supporting IT infrastructure should consider these certifications to validate their expertise and advance their careers.
- Q11: What types of CompTIA Certification Exams are available?
- A: CompTIA offers various certification paths, including:
- Q12: How do I prepare for CompTIA Certification Exams?
- A: Preparation can include official CompTIA training courses, study guides, practice exams, online tutorials, and hands-on experience in relevant IT disciplines.
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- A: CompTIA Certification Exams can be taken at authorized Pearson VUE testing centers worldwide or online, providing flexibility to fit your schedule and location.
- Q14: How do CompTIA Certifications impact my career?
- A: CompTIA Certifications significantly boost your career by demonstrating your expertise to employers, making you a more competitive candidate for advanced roles and promotions in IT support, networking, cybersecurity, and cloud computing.
- Q15: Are there any prerequisites for CompTIA Certification Exams?
- A: Some exams may have prerequisites, such as foundational knowledge or prior certifications. Check the specific requirements for each certification path on the CompTIA website.
- Q16: How often do I need to recertify for CompTIA Certifications?
- A: CompTIA Certifications typically require recertification every three years to ensure that certified professionals stay updated with the latest IT technologies and industry practices.