XK0-006 Linux Certification
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Official Name: CompTIA XK0-006 Linux Certification
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Start NowAbout the CompTIA XK0-006 Linux Certification Certification
The CompTIA XK0-006 Linux Certification certification is designed for professionals who administer Linux systems, automate tasks, and troubleshoot issues in cloud, security, and DevOps-driven environments.. As technology evolves and industry demands grow more complex, this credential validates your ability to apply real-world skills and knowledge using CompTIA tools and frameworks. Earning the certification positions you as a trusted expert, capable of solving high-impact challenges and contributing to secure, scalable, and efficient systems.
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Test Your Knowledge of CompTIA XK0-006 Linux Certification
Question #1
A user cannot access the company’s internal website after a recent DNS server migration.
What should the administrator check first?
A) Update the /etc/resolv.conf file with the new DNS server
B) Install a new kernel
C) Replace system RAM
D) Change desktop background
Solution
Correct answers: Update the /etc/resolv.conf file with the new DNS server – Explanation:
The resolv.conf file specifies DNS servers in Linux. Outdated DNS entries can prevent access; the other options are unrelated to DNS resolution.
Question #2
A script that previously ran successfully now fails with a “Permission denied” error.
How should the issue be resolved?
A) Modify file permissions with chmod
B) Install new hardware
C) Upgrade the file system
D) Reboot the network switch
Solution
Correct answers: Modify file permissions with chmod – Explanation:
chmod changes file execution permissions. Hardware, filesystems, and network devices are not relevant for script permissions.
Question #3
A user cannot SSH into a server, but can ping it successfully.
What is the most likely cause?
A) The SSH service is not running on the server
B) A faulty network cable
C) Insufficient disk space
D) The user’s password has expired
Solution
Correct answers: The SSH service is not running on the server – Explanation:
Ping shows network connectivity; SSH requires the service to be active. Cables, disk space, or passwords would have different symptoms.
Question #4
A system administrator needs to automate the daily backup of user home directories.
Which tool is most appropriate?
A) cron
B) vi
C) df
D) top
Solution
Correct answers: cron – Explanation:
cron schedules and automates repetitive tasks like backups. vi is an editor, df checks disk space, top monitors processes.
Question #5
An administrator receives an alert about high disk usage on /var/log.
What should be done first?
A) Archive or delete old log files
B) Replace the CPU
C) Add more RAM
D) Disable SELinux
Solution
Correct answers: Archive or delete old log files – Explanation:
Freeing up space in /var/log prevents system issues. CPU, RAM, or SELinux are unrelated to disk space in /var/log.
Question #6
A Linux web server fails to start the Apache service after a configuration change.
What is the best initial troubleshooting command?
A) Check the syntax with apachectl configtest
B) Update the system BIOS
C) Format the server
D) Edit the /etc/fstab file
Solution
Correct answers: Check the syntax with apachectl configtest – Explanation:
apachectl configtest detects syntax errors in Apache configs. BIOS, formatting, or fstab edits don’t help with Apache startup failures.
Question #7
A user accidentally deleted an important file from their home directory.
Which step increases the chance of recovery?
A) Stop using the disk and attempt file recovery immediately
B) Reinstall the operating system
C) Upgrade the kernel
D) Change desktop background
Solution
Correct answers: Stop using the disk and attempt file recovery immediately – Explanation:
Further disk writes may overwrite deleted files. Reinstalling, kernel upgrades, or ownership changes do not help recovery.
Question #8
A developer wants to give execute permissions only to the file owner for a script.
Which chmod command should be used?
A) chmod 700 script.sh
B) chmod 444 script.sh
C) chmod 777 script.sh
D) chmod 666 script.sh
Solution
Correct answers: Update the /etc/resolv.conf file with the new DNS server – Explanation:
The resolv.conf file specifies DNS servers in Linux. Outdated DNS entries can prevent access; the other options are unrelated to DNS resolution.
Question #9
A Linux server must allow only specific IP addresses to access SSH.
What is the best way to implement this?
A) Update firewall rules to permit only trusted IPs on port 22
B) Install a new GUI
C) Increase swap space
D) Change default shell
Solution
Correct answers: Update firewall rules to permit only trusted IPs on port 22 – Explanation:
Firewall rules restrict SSH access. GUI, swap, or shell changes do not control remote access.
Question #10
A user needs to find all files named “config.txt” in the /home directory and its subdirectories.
Which command should be used?
A) find /home -name config.txt
B) ls -l /home/config.txt
C) cat /home/*
D) df -h
Solution
Correct answers: find /home -name config.txt – Explanation:
find recursively searches directories. ls lists files, cat displays contents, df shows disk usage.
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