[2026] XK0-005 by Linux+ Actual Free Exam Practice Test [Q50-Q74]

NO.50 A Linux administrator was tasked with deleting all files and directories with names that are contained in the sobelete.txt file. Which of the following commands will accomplish this task?

xargs -f cat toDelete.txt -rm

rm -d -r -f toDelete.txt

cat toDelete.txt | rm -frd

cat toDelete.txt | xargs rm -rf

NO.51 A systems administrator changed the file permissions on the myfile file:
-rwxrwxr-x 1 admin editors … myfile
Then the administrator added an existing user test to the editors group:
sudo usermod -a -G editors test
However, the user test is still unable to edit the file. Which of the following solutions will fix this issue?

The user “test” needs to log out and log back in before editing the myfile file.

The file is only writable by the root user, and the user “test” needs root permissions.

The group for the user “test” needs to be reloaded by running sudo source /etc/group.

In order to edit the file, additional permissions are required that the user “test” does not have.

NO.52 A systems administrator received a notification that a system is performing slowly. When running the top command, the systems administrator can see the following values:

Which of the following commands will the administrator most likely run NEXT?

vmstat

strace

htop

lsof

NO.53 A Linux administrator needs to determine whether a hostname is in the DNS. Which of the following would supply the information that is needed?

nslookup

rsync

netstat

host

NO.54 A systems administrator received a report about issues with a Linux system Given the following output:

Which of the following is the best command to use to fix this issue?

mkfs.xfs /var

rm -rf /var/*

lvextend -L +5G -r /dev/mapper/rootvg-varlv

lvresize -L +2G -r /dev/mapper/rootvg-rootlv

NO.55 A new application container was built with an incorrect version number. Which of the following commands should be used to rename the image to match the correct version 2.1.2?

docker tag comptia/app:2.1.1 comptia/app:2.1.2

docker push comptia/app:2.1.1 comptia/app:2.1.2

docker rmi comptia/app:2.1.1 comptia/app:2.1.2

docker update comptia/app:2.1.1 comptia/app:2.1.2

NO.56 A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue. However, the next day the administrator was presented again with a non-GUI terminal. Which of the following is the issue?

The administrator did not reboot the server properly.

The administrator did not set the default target to basic.target.

The administrator did not set the default target to graphical.target.

The administrator did not shut down the server properly.

NO.57 Users report that they cannot access some files located in the /opt/finapp directory after a power outage caused an unexpected server restart. A Linux administrator examines the following filesystem details and system logs:
# mount | grep finapp
/dev/mapper/rhel-opt_finapp on /opt/finapp type xfs (rw,relatime,seclabel,attr2,inode64,logbufs=8, logbsize=32k,noquota)
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
##sda1 8:1 0 1G 0 part /boot
##sda2 8:2 0 930.5G 0 part
##rhel-root 253:0 0 30.5G 0 lvm /
##rhel-opt_finapp 253:1 0 900G 0 lvm /opt/finapp
# grep opt_finapp /var/log/messages
XFS (opt_finapp): Corruption detected in inode 3645, extent tree
Which of the following commands should the administrator run in an attempt to fix the filesystem?

fdisk /dev/mapper/rhel-opt_finapp

xfs_repair /dev/mapper/rhel-opt_finapp

lvcreate -L900G -n opt_finapp rhel

fsck.ext4 /dev/mapper/rhel-opt_finapp

NO.58 After installing a new version of a package, a systems administrator notices a new version of the corresponding, service file was Installed In order to use the new version of the, service file, which of the following commands must be Issued FIRST?

systemctl status

systemctl stop

systemctl reinstall

systemctl daemon-reload

NO.59 A Linux administrator needs to back up the folder /usr/domain, and the output must be a gzip compressed tar.
Which of the following commands should be used?

tar -cv domain.tar.gz /usr/domain

tar -cvf /usr/domain domain.tar.gz

tar -czvf domain.tar.gz /usr/domain

tar -cxzv /usr/domain domain.tar.gz

NO.60 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

Explanation
The command sed -i ‘s/auto/persistent/g’ /etc/systemd/journald.conf && sed -i ‘persistent/s/’#//q’
/etc/systemd/journald.conf will accomplish the task of guaranteeing the persistency of journal log files across system reboots. The sed command is a tool for editing text files on Linux systems. The -i option modifies the file in place.The s command substitutes one string for another. The g flag replaces all occurrences of the string.
The && operator executes the second command only if the first command succeeds. The q command quits after the first match. The /etc/systemd/journald.conf file is a configuration file for the systemd-journald service, which is responsible for collecting and storing log messages. The command sed -i ‘s/auto/persistent/g’
/etc/systemd/journald.conf will replace the word auto with the word persistent in the file. This will change the value of the Storage option, which controls where the journal log files are stored. The value auto means that the journal log files are stored in the volatile memory and are lost after reboot, while the value persistent means that the journal log files are stored in the persistent storage and are preserved across reboots. The command sed -i ‘persistent/s/’#//q’ /etc/systemd/journald.conf will remove the # character at the beginning of the line that contains the word persistent. This will uncomment the Storage option and enable it.
The command sed -i ‘s/auto/persistent/g’ /etc/systemd/journald.conf && sed -i ‘persistent/s/’#//q’
/etc/systemd/journald.conf will guarantee the persistency of journal log files across system reboots by changing and enabling the Storage option to persistent. This is the correct command to use to accomplish the task. The other options are incorrect because they either do not change the value of the Storage option (grep -i auto /etc/systemd/journald.conf && systemctl restart systemd-journald.service or cat
/etc/systemd/journald.conf | awk ‘(print $1,$3)’) or do not enable the Storage option (journalctl –list-boots && systemctl restart systemd-journald.service). References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 16: Managing Logging and Monitoring, page 489.

NO.61 A Linux administrator is troubleshooting SSH connection issues from one of the workstations.
When users attempt to log in from the workstation to a server with the IP address 104.21.75.76, they receive the following message:

The administrator reviews the information below:

Which of the following is causing the connectivity issue?

The workstation has the wrong IP settings.

The sshd service is disabled.

The server’s firewall is preventing connections from being made.

The server has an incorrect default gateway configuration.

NO.62 A Linux administrator is troubleshooting an issue in which users are not able to access
https://portal.comptia.org from a specific workstation. The
administrator runs a few commands and receives the following output:

Which of the following tasks should the administrator perform to resolve this issue?

Update the name server in resolv. conf to use an external DNS server.

Remove the entry for portal . comptia.org from the local hosts file.

Add a network route from the 10.10.10.0/24 to the 192.168.0.0/16.

Clear the local DNS cache on the workstation and rerun the host command.

NO.63 A cloud engineer wants to delete all unused networks that are not referenced by any container.
Which of the following commands will achieve this goal?

docker network erase

docker network clear

docker network prune

docker network rm

NO.64 An administrator would like to securely connect to a server and forward port 8080 on a local machine to port
80 on the server. Which of the following commands should the administrator use to satisfy both requirements?

ssh -L 8080: localhost:80 admin@server

ssh -R 8080: localhost:80 admin@server

ssh -L 80 : localhost:8080 admin@server

ssh -R 80 : localhost:8080 admin@server

NO.65 A Linux administrator is reviewing changes to a configuration file that includes the following section:

The Linux administrator is trying to select the appropriate syntax formatter to correct any issues with the configuration file. Which of the following should the syntax formatter support to meet this goal?

Markdown

XML

YAML

JSON

NO.66 A systems administrator is receiving tickets from users who cannot reach the application app that should be listening on port 9443/tcp on a Linux server.
To troubleshoot the issue, the systems administrator runs netstat and receives the following output:

Based on the information above, which of the following is causing the issue?

The IP address 0.0.0.0 is not valid.

The application is listening on the loopback interface.

The application is listening on port 1234.

The application is not running.

NO.67 A junior Linux administrator is tasked with installing an application. The installation guide states the application should only be installed in a run level 5 environment.

Which of the following commands would ensure the server is set to runlevel 5?

systemct1 isolate multi-user.target

systemct1 isolate graphical.target

systemct1 isolate network.target

systemct1 isolate basic.target

NO.68 A Linux administrator found many containers in an exited state. Which of the following commands will allow the administrator to clean up the containers in an exited state?

docker rm –all

docker rm $(docker ps -aq)

docker images prune *

docker rm –state exited

NO.69 A Linux systems administrator is setting up a new web server and getting 404 – NOT FOUND errors while trying to access the web server pages from the browser. While working on the diagnosis of this issue, the Linux systems administrator executes the following commands:

Which of the following commands will BEST resolve this issue?

sed -i ‘s/SELINUX=enforcing/SELINUX=disabled/’ /etc/selinux/config

restorecon -R -v /var/www/html

setenforce 0

setsebool -P httpd_can_network_connect_db on

NO.70 A systems administrator is cloning a system partition /dev/sda1 to /dev/sdc1. Which of the following commands would allow the administrator to accomplish this task most efficiently?

dd if=/dev/sda1 of=/dev/sdc1

cat /dev/sda1 > /dev/sdc1

cp -R /dev/sda1 /dev/sdc1

rsync -av /dev/sda1 /dev/sdc1

NO.71 A systems administrator is configuring a Linux system so that network traffic from the internal network 172.17.0.0/16 going out through the eth0 interface would appear as if it was sent directly from this interface. Which of the following commands will accomplish this task?

iptables -A POSTROUTING -s 172.17.0.0/16 -o eth0 -j MASQUERADE

firewalld -A OUTPUT -s 172.17.0.0/16 -o eth0 -j DIRECT

nmcli snasq-traffic eth0 -s 172.17.0.0/16 -j MASQUERADE

ifconfig –nat eth0 -s 172.17.0.0/16 -j DIRECT

NO.72 An administrator wants to execute a long-running script in the terminal while troubleshooting another issue. Which of the following options will achieve this goal?

bash script.sh &

source script.sh

sh script.sh | jobs

nice -10 ./script.sh

NO.73 A Linux administrator needs to run a web application on a server that requires the use of a desktop web browser to enter the final configuration information. The administrator determines the server is running in multi-user mode. The administrator verifies that a web browser is installed on the server and that it has a display manager installed. Which of the following commands will best allow the administrator to temporarily use the web browser on the server?

sudo systemctl isolate graphical.target

sudo systemctl set-default runlevel5.target

sudo systemctl restart gdm

sudo systemctl –no-wall rescue

NO.74 A developer has been unable to remove a particular data folder that a team no longer uses. The developer escalated the issue to the systems administrator. The following output was received:

Which of the following commands can be used to resolve this issue?

chgrp -R 755 data/

chmod -R 777 data/

chattr -R -i data/

chown -R data/

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