Free XK0-004: CompTIA Linux Exam Questions and Answers

Last updated: August 31, 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%

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1. Question #1

   A Linux administrator needs to switch from text mode to GUI. Which of the following runlevels will start the GUI by default?

   • A. Runlevel 3
   • B. Runlevel 4
   • C. Runlevel 5
   • D. Runlevel 6
   Reveal Answer

2. Question #2

   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?

   • A. Boot into a single-user mode and reset the password via the passwd command.
   • B. Boot into a single-user mode and reset the password by editing the /etc/passwd file.
   • C. Boot into a single-user mode and reset the password by editing the /etc/shadow file.
   • D. Boot into a single-user mode and reset the password via the chage command.
   Reveal Answer

3. Question #3

   A Linux administrator needs every new file created on a directory to maintain the group permissions of the same directory. Which of the following commands would satisfy this requirement?

   • A. chmod o+s
   • B. chmod u+s
   • C. chmod +s
   • D. chmod g+s
   Reveal Answer

4. Question #4

   Ann, a junior Linux administrator, needs to copy software from her local machine to assist in developing a software application on a remote machine with the IP address 192.168.3.22. The file needs to be placed on the /tmp directory. After downloading the RPM to the local machine, which of the following commands would be BEST to use to copy the software?

   • A. scp ~/software.rpm USER@192.168.3.22:/tmp
   • B. scp ~/software.rpm USER@192.168.3.22: /tmp
   • C. wget USER@192.168.3.22:/tmp -f ~/software.rpm
   • D. scp USER@192.168.3.22 ~/software.rpm :/tmp
   Reveal Answer

5. Question #5

   Which of the following is the purpose of the vmlinux file on a Linux system?

   • A. To prevent a Linux kernel panic
   • B. To start a Linux virtual machine
   • C. To provide the executable kernel for the system
   • D. To enable resource access to the network
   Reveal Answer

6. Question #6

   A systems administrator needs to retrieve specific fields from a csv file. Which of the following tools would accomplish this task?

   • A. awk
   • B. sort
   • C. print
   • D. echo
   Reveal Answer

7. Question #7

   A Linux server has multiple IPs. A Linux administrator needs to verify if the HTTP server port is bound to the correct IP. Which of the following commands would BEST accomplish this task?

   • A. route
   • B. host
   • C. nslookup
   • D. netstat
   Reveal Answer

8. Question #8

   Which of the following configuration files should be modified to disable Ctrl-Alt-Del in Linux?

   • A. /etc/inittab
   • B. ~/.bash_profile
   • C. /etc/securetty
   • D. /etc/security/limits.conf
   Reveal Answer

9. Question #9

   All users are reporting that they cannot connect to the SFTP server. The administrator runs a scan: Which of the following would allow the administrator to fix the problem?

   • A. Allow SFTP connections on port 22 using /etc/sysconfig/iptables.
   • B. Allow SFTP connections on port 20 and 21 using /etc/sysconfig/iptables.
   • C. Allow SFTP connections on port 25 using /etc/sysconfig/iptables.
   • D. Allow SFTP connections on port 1456 using /etc/sysconfig/iptables.
   Reveal Answer

10. Question #10

    In order to comply with new security policies, an administrator needs to prevent the SSH server from using insecure algorithms. Which of the following files should be edited to accomplish this?

    • A. /etc/ssh/sshd_config
    • B. /etc/ssh/ssh_config
    • C. ~/.ssh/ssh_config
    • D. /etc/ssh/known_hosts
    Reveal Answer