Free CompTIA Linux+ Certification Exam XK0-005 Exam Practice Test

A cloud engineer needs to remove all dangling images and delete all the images that do not have an associated container. Which of the following commands will help to accomplish this task?

• docker images prune -a
• docker push images -a
• docker rmi -a images
• docker images rmi --all

A development team asks an engineer to guarantee the persistency of journal log files across system reboots. Which of the following commands would accomplish this task?

• grep -i auto /etc/systemd/journald.conf && systemctl restart systemd-journald.service
• cat /etc/systemd/journald.conf | awk '(print $1,$3)'
• sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/#//q' /etc/systemd/journald.conf
• journalctl --list-boots && systemctl restart systemd-journald.service

A Linux administrator rebooted a server. Users then reported some of their files were missing. After doing some troubleshooting, the administrator found one of the filesystems was missing. The filesystem was not listed in /etc/f stab and might have been mounted manually by someone prior to reboot. Which of the following would prevent this issue from reoccurring in the future?

• Sync the mount units.
• Mount the filesystem manually.
• Create a mount unit and enable it to be started at boot.
• Remount all the missing filesystems

A Linux engineer needs to create a custom script, cleanup.sh, to run at boot as part of the system services. Which of the following processes would accomplish this task?

• Create a unit file in the /etc/default/ directory. systemctl enable cleanup systemctl is-enabled cleanup
• Create a unit file in the /etc/ske1/ directory. systemctl enable cleanup systemctl is-enabled cleanup
• Create a unit file in the /etc/systemd/system/ directory. systemctl enable cleanup systemctl is-enabled cleanup
• Create a unit file in the /etc/sysctl.d/ directory. systemctl enable cleanup systemctl is-enabled cleanup

Which of the following technologies provides load balancing, encryption, and observability in containerized environments?

• Virtual private network
• Sidecar pod
• Overlay network
• Service mesh

To harden one of the servers, an administrator needs to remove the possibility of remote administrative login via the SSH service. Which of the following should the administrator do?

• Add the line DenyUsers root to the /etc/hosts.deny file.
• Set PermitRootLogin to no in the /etc/ssh/sshd_config file.
• Add the line account required pam_nologin. so to the /etc/pam.d/sshd file.
• Set PubKeyAuthentication to no in the /etc/ssh/ssh_config file.

A cloud engineer needs to block the IP address 192.168.10.50 from accessing a Linux server. Which of the following commands will achieve this goal?

• iptables -F INPUT -j 192.168.10.50 -m DROP
• iptables -A INPUT -s 192.168.10.30 -j DROP
• iptables -i INPUT --ipv4 192.168.10.50 -z DROP
• iptables -j INPUT 192.168.10.50 -p DROP

A systems administrator wants to test the route between IP address 10.0.2.15 and IP address 192.168.1.40. Which of the following commands will accomplish this task?

• route -e get to 192.168.1.40 from 10.0.2.15
• ip route get 192.163.1.40 from 10.0.2.15
• ip route 192.169.1.40 to 10.0.2.15
• route -n 192.168.1.40 from 10.0.2.15

A systems technician is working on deploying several microservices to various RPM-based systems, some of which could run up to two hours. Which of the following commands will allow the technician to execute those services and continue deploying other microservices within the same terminal section?

• gedit & disown
• kill 9 %1
• fg %1
• bg %1 job name

A Linux administrator needs to create a new user named user02. However, user02 must be in a different home directory, which is under /comptia/projects. Which of the following commands will accomplish this task?

• useradd -d /comptia/projects user02
• useradd -m /comptia/projects user02
• useradd -b /comptia/projects user02
• useradd -s /comptia/projects user02