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Exam Overview
Exam Code XK0-004
Exam Name CompTIA Linux+ (Plus)
Vendor CompTIA
Total Questions 483
Last Updated 26-Oct, 2026
Free XK0-004 Questions Get Premium Access
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Free XK0-004 Practice Questions

Explore 5 free practice questions for the CompTIA XK0-004 exam and review the answers and explanations to support your preparation.

  1. Question 1

    Drag & Drop

    DRAG DROP
    The lead Linux has added a disk, /dev/sdd, to a VM that is running out of disk space. Place the
    following steps in the correct order from first (1) to last (4) to add the disk to the existing LVM.

    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer


    Explanation


  2. Question 2

    Drag & Drop

    A junior system administrator had trouble installing and running an Apache web server on a Linux
    server. You have been tasked with installing the Apache web server on the Linux server and
    resolving the issue that prevented the junior administrator from running Apache.
    INSTRUCTIONS
    Install Apache and start the service. Verify that the Apache service is running with the defaults.
    Typing “help” in the terminal will show a list of relevant commands.
    If at any time you would like to bring back the initial state of the simulation, please click the Reset All
    button.

    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer


    Explanation


  3. Question 3

    Single answer

    Which of the following is the BEST reason for not storing database files in the /var directory?


    • Option A:
      The /var filesystem is not fast enough for database files.


      Correct
    • Option B:
      The number of files in /var is limited by the available inodes.


      Correct
    • Option C:
      Files in /var do not have strict file permissions.

      Correct
    • Option D:
      If log files fill up /var, it might corrupt the database.
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: D

    Explanation

    The best answer is D. If log files fill up /var, it might corrupt the database. The /var directory is used for variable data such as log files, cache files, and application data, which can grow unexpectedly over time. If log files consume all available space in the /var filesystem, a database stored there may be unable to write new data or complete transactions properly. This can lead to database errors, service interruptions, or even data corruption. Therefore, databases are often placed on a separate filesystem or partition to protect them from space-related issues caused by other applications.

  4. Question 4

    Single answer

    Atechnical support engineer receives a ticket from a user who is trying to create a 1KB file in the
    /tmp directory and is getting the following error No space left on device. The support engineer
    checks the /tmp directory, and it has 20GB of free space.
    Which of the following BEST describes a possible cause for this error?


    • Option A:
      The /tmp directory is not mounted.


      Correct
    • Option B:
      B. The filesystem is formatted with a 4MB block size.


      Correct
    • Option C:
      the files ystem ran out of inodes.


      Correct
    • Option D:
      The /tmp directory has been set with an immutable attribute.
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: C

    Explanation

    Even though the /tmp directory has 20GB of free disk space, creating a new file also requires a free inode, which stores metadata about files. If all available inodes have been used, the system cannot create any additional files and will return the error "No space left on device" despite having plenty of free storage space. This situation commonly occurs when a filesystem contains a very large number of small files. Therefore, the most likely cause of the error is that the filesystem has exhausted its available inodes, making Option C the best answer.

  5. Question 5

    Single answer

    Which of the following would be the BEST solution for a systems administrator to access the
    graphical user environment of a Linux machine remotely?


    • Option A:
      VNC
      Correct
    • Option B:
      KDE
      Correct
    • Option C:
      X11

      Correct
    • Option D:
      RPC
      Correct
    Show Answer & Explanation Hide Answer & Explanation

    Correct Answer: A

    Explanation

    The correct answer is A. VNC. Virtual Network Computing (VNC) is a remote desktop protocol that allows a systems administrator to access and control the graphical user interface (GUI) of a Linux machine from another computer over a network. It transmits keyboard, mouse, and screen data, enabling full remote administration as if the administrator were physically present at the machine. KDE is a desktop environment, not a remote access solution; X11 is a windowing system that provides graphical capabilities but is not primarily designed for complete remote desktop access; and RPC (Remote Procedure Call) is a protocol for executing functions on remote systems rather than accessing a graphical desktop. Therefore, VNC is the best solution for remotely accessing a Linux GUI environment.