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XK0-005 CompTIA Linux+ Exam Questions and Answers

Questions 4

A new disk was presented to a server as /dev/ sdd. The systems administrator needs to check if a partition table is on that disk. Which of the following commands can show this information?

Options:

A.

Isscsi

B.

fdisk

C.

blkid

D.

partprobe

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Questions 5

A user is attempting to log in to a Linux server that has Kerberos SSO ena-bled. Which of the following commands should the user run to authenticate

and then show the ticket grants? (Select TWO).

Options:

A.

kinit

B.

klist

C.

kexec

D.

kioad

E.

pkexec

F.

realm

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Questions 6

After starting an Apache web server, the administrator receives the following error:

Apr 23 localhost.localdomain httpd 4618] : (98) Address already in use: AH00072: make_sock: could not bind to address [: :]80

Which of the following commands should the administrator use to further trou-bleshoot this issue?

Options:

A.

Ss

B.

Ip

C.

Dig

D.

Nc

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Questions 7

Which of the following tools is BEST suited to orchestrate a large number of containers across many different servers?

Options:

A.

Kubernetes

B.

Ansible

C.

Podman

D.

Terraform

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Questions 8

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?

Options:

A.

iptables -F INPUT -j 192.168.10.50 -m DROP

B.

iptables -A INPUT -s 192.168.10.30 -j DROP

C.

iptables -i INPUT --ipv4 192.168.10.50 -z DROP

D.

iptables -j INPUT 192.168.10.50 -p DROP

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Questions 9

A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection.

Given the following output:

Which of the following commands would resolve the issue and allow an SSH connection to be established without a password?

Options:

A.

restorecon -rv .ssh/authorized_key

B.

mv .ssh/authorized_key .ssh/authorized_keys

C.

systemct1 restart sshd.service

D.

chmod 600 mv .ssh/authorized_key

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Questions 10

While inspecting a recently compromised Linux system, the administrator identified a number of processes that should not have been running:

Which of the following commands should the administrator use to terminate all of the identified processes?

Options:

A.

pkill -9 -f "upload*.sh"

B.

kill -9 "upload*.sh"

C.

killall -9 -upload*.sh"

D.

skill -9 "upload*.sh"

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Questions 11

A systems administrator is notified that the mysqld process stopped unexpectedly. The systems administrator issues the following command:

sudo grep –i -r ‘out of memory’ /var/log

The output of the command shows the following:

kernel: Out of memory: Kill process 9112 (mysqld) score 511 or sacrifice child.

Which of the following commands should the systems administrator execute NEXT to troubleshoot this issue? (Select two).

Options:

A.

free -h

B.

nc -v 127.0.0.1 3306

C.

renice -15 $( pidof mysql )

D.

lsblk

E.

killall -15

F.

vmstat -a 1 4

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Questions 12

A systems administrator needs to reconfigure a Linux server to allow persistent IPv4 packet forwarding. Which of the following commands is the correct way to accomplish this task?

Options:

A.

echo 1 > /proc/sys/net/ipv4/ipv_forward

B.

sysctl -w net.ipv4.ip_forward=1

C.

firewall-cmd --enable ipv4_forwarding

D.

systemct1 start ipv4_forwarding

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Questions 13

A Linux administrator needs to analyze a failing application that is running inside a container. Which of the following commands allows the Linux administrator to enter the running container and analyze the logs that are stored inside?

Options:

A.

docker run -ti app /bin/sh

B.

podman exec -ti app /bin/sh

C.

podman run -d app /bin/bash

D.

docker exec -d app /bin/bash

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Questions 14

Which of the following files holds the system configuration for journal when running systemd?

Options:

A.

/etc/systemd/journald.conf

B.

/etc/systemd/systemd-journalctl.conf

C.

/usr/lib/systemd/journalctl.conf

D.

/etc/systemd/systemd-journald.conf

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Questions 15

An administrator transferred a key for SSH authentication to a home directory on a remote server. The key file was moved to .ssh/authorized_keys location in order to establish SSH connection without a password. However, the SSH command still asked for the password. Given the following output:

Which of the following commands would resolve the issue?

Options:

A.

restorecon .ssh/authorized_keys

B.

ssh_keygen -t rsa -o .ssh/authorized_keys

C.

chown root:root .ssh/authorized_keys

D.

chmod 600 .ssh/authorized_keys

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Questions 16

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?

Options:

A.

The workstation has the wrong IP settings.

B.

The sshd service is disabled.

C.

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

D.

The server has an incorrect default gateway configuration.

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Questions 17

A systems administrator needs to clone the partition /dev/sdc1 to /dev/sdd1. Which of the following commands will accomplish this task?

Options:

A.

tar -cvzf /dev/sdd1 /dev/sdc1

B.

rsync /dev/sdc1 /dev/sdd1

C.

dd if=/dev/sdc1 of=/dev/sdd1

D.

scp /dev/sdc1 /dev/sdd1

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Questions 18

A Linux system is getting an error indicating the root filesystem is full. Which of the following commands should be used by the systems administrator to resolve this issue? (Choose three.)

Options:

A.

df -h /

B.

fdisk -1 /dev/sdb

C.

growpart /dev/mapper/rootvg-rootlv

D.

pvcreate /dev/sdb

E.

lvresize –L +10G -r /dev/mapper/rootvg-rootlv

F.

lsblk /dev/sda

G.

parted -l /dev/mapper/rootvg-rootlv

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Questions 19

A systems administrator needs to verify whether the built container has the app.go file in its root directory. Which of the following can the administrator use to verify the root directory has this file?

Options:

A.

docker image inspect

B.

docker container inspect

C.

docker exec ls

D.

docker ps

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Questions 20

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?

Options:

A.

systemct1 status

B.

systemct1 stop

C.

systemct1 reinstall

D.

systemct1 daemon-reload

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Questions 21

In which of the following filesystems are system logs commonly stored?

Options:

A.

/var

B.

/tmp

C.

/etc

D.

/opt

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Questions 22

A systems administrator is enabling LUKS on a USB storage device with an ext4 filesystem format. The administrator runs dmesg and notices the following output:

Given this scenario, which of the following should the administrator perform to meet these requirements? (Select three).

Options:

A.

gpg /dev/sdcl

B.

pvcreate /dev/sdc

C.

mkfs . ext4 /dev/mapper/LUKSCJ001 - L ENCRYPTED

D.

umount / dev/ sdc

E.

fdisk /dev/sdc

F.

mkfs . vfat /dev/mapper/LUKS0001 — L ENCRYPTED

G.

wipefs —a/dev/sdbl

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Questions 23

A database administrator requested the installation of a custom database on one of the servers. Which of the following should the Linux administrator configure so the requested packages can be installed?

Options:

A.

/etc/yum.conf

B.

/etc/ssh/sshd.conf

C.

/etc/yum.repos.d/db.repo

D.

/etc/resolv.conf

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Questions 24

Application code is stored in Git. Due to security concerns, the DevOps engineer does not want to keep a sensitive configuration file, app . conf, in the

repository. Which of the following should the engineer do to prevent the file from being uploaded to the repository?

Options:

A.

Run git exclude app. conf.

B.

Run git stash app. conf.

C.

Add app . conf to . exclude.

D.

Add app . conf to . gitignore.

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Questions 25

A DevOps engineer needs to allow incoming traffic to ports in the range of 4000 to 5000 on a Linux server. Which of the following commands will enforce this rule?

Options:

A.

iptables -f filter -I INPUT -p tcp --dport 4000:5000 -A ACCEPT

B.

iptables -t filter -A INPUT -p tcp --dport 4000:5000 -j ACCEPT

C.

iptables filter -A INPUT -p tcp --dport 4000:5000 -D ACCEPT

D.

iptables filter -S INPUT -p tcp --dport 4000:5000 -A ACCEPT

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Questions 26

An administrator deployed a Linux server that is running a web application on port 6379/tcp.

SELinux is in enforcing mode based on organization policies.

The port is open on the firewall.

Users who are trying to connect to a local instance of the web application receive Error 13, Permission denied.

The administrator ran some commands that resulted in the following output:

Which of the following commands should be used to resolve the issue?

Options:

A.

semanage port -d -t http_port_t -p tcp 6379

B.

semanage port -a -t http_port_t -p tcp 6379

C.

semanage port -a http_port_t -p top 6379

D.

semanage port -l -t http_port_tcp 6379

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Questions 27

A Linux administrator wants to find out whether files from the wget package have been altered since they were installed. Which of the following commands will provide the correct information?

Options:

A.

rpm -i wget

B.

rpm -qf wget

C.

rpm -F wget

D.

rpm -V wget

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Questions 28

Users are unable to create new files on the company's FTP server, and an administrator is troubleshooting the issue. The administrator runs the following commands:

Which of the following is the cause of the issue based on the output above?

Options:

A.

The users do not have the correct permissions to create files on the FTP server.

B.

The ftpusers filesystem does not have enough space.

C.

The inodes is at full capacity and would affect file creation for users.

D.

ftpusers is mounted as read only.

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Questions 29

A Linux administrator provisioned a new web server with custom administrative permissions for certain users. The administrator receives a report that user1 is unable to restart the Apache web service on this server. The administrator reviews the following output:

[ root@server ] # id user1

UID=1011 (user1) gid=1011 (USER1) groups=1011 (user1), 101 (www-data), 1120 (webadmin)

[ root@server ] # cat /etc/sudoers.d/custom.conf

user1 ALL=/usr/sbin/systemctl start httpd, /usr/sbin/systemctl stop httpd

webadmin ALL=NOPASSWD: /etc/init.d.httpd restart, /sbin/service httpd restart, /usr/sbin/apache2ctl restart

#%wheel ALL=(ALL) NOPASSWD: ALL

Which of the following would most likely resolve the issue while maintaining a least privilege security model?

Options:

A.

User1 should be added to the wheel group to manage the service.

B.

User1 should have "NOPASSWD:" after the "ALL=" in the custom. conf.

C.

The wheel line in the custom. conf file should be uncommented.

D.

Webadmin should be listed as a group in the custom. conf file.

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Questions 30

A Linux administrator is configuring a two-node cluster and needs to be able to connect the nodes to each other using SSH keys from the root account. Which of the following commands will accomplish this task?

Options:

A.

[root@nodea ssh —i ~/ . ssh/±d rsa root@nodeb

B.

[root@nodea scp -i . ssh/id rsa root@nodeb

C.

[root@nodea ssh—copy-id —i .ssh/id rsa root@nodeb

D.

[root@nodea # ssh add -c ~/ . ssh/id rsa root@nodeb

E.

[root@nodea # ssh add -c ~/. ssh/id rsa root@nodeb

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Questions 31

A systems administrator receives reports that several virtual machines in a host are responding slower than expected. Upon further investigation, the administrator obtains the following output from one of the affected systems:

Which of the following best explains the reported issue?

Options:

A.

The physical host is running out of CPU resources, leading to insufficient CPU time being allocated to virtual machines.

B.

The physical host has enough CPU cores, leading to users running more processes to compensate for the slower response times.

C.

The virtual machine has enough CPU cycles, leading to the system use percentage being higher than expected.

D.

The virtual machine is running out of CPU resources, leading to users experiencing longer response times.

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Questions 32

A Linux systems administrator needs to copy files and directories from Server A to Server B. Which of the following commands can be used for this purpose? (Select TWO)

Options:

A.

rsyslog

B.

cp

C.

rsync

D.

reposync

E.

scp

F.

ssh

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Questions 33

A cloud engineer needs to check the link status of a network interface named eth1 in a Linux server. Which of the following commands can help to achieve the goal?

Options:

A.

ifconfig hw eth1

B.

netstat -r eth1

C.

ss -ti eth1

D.

ip link show eth1

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Questions 34

A Linux administrator has physically added a new RAID adapter to a system. Which of the following commands should the Linux administrator run to confirm that the device has been recognized? (Select TWO).

Options:

A.

rmmod

B.

Is -11 /etc

C.

Ishw —class disk

D.

pvdisplay

E.

rmdir /dev

F.

dmesg

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Questions 35

A DevOps engineer wants to allow the same Kubernetes container configurations to be deployed in development, testing, and production environments. A key requirement is that the containers should be configured so that developers do not have to statically configure custom, environment-specific locations. Which of the following should the engineer use to meet this requirement?

Options:

A.

Custom scheduler

B.

Node affinity

C.

Overlay network

D.

Ambassador container

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Questions 36

A systems administrator was tasked with assigning the temporary IP address/netmask 192.168.168.1/255.255.255.255 to the interface eth0 of a Linux server.

When adding the address, the following error appears:

# ip address add 192.168.168.1/33 dev eth0

Error: any valid prefix is expected rather than "192.168.168.1/33".

Based on the command and its output above, which of the following is the cause of the issue?

Options:

A.

The CIDR value /33 should be /32 instead.

B.

There is no route to 192.168.168.1/33.

C.

The interface eth0 does not exist.

D.

The IP address 192.168.168.1 is already in use.

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Questions 37

A user is cleaning up a directory because it has more than 100,000 files that were generated from an experiment. When the user tries to remove the unneeded experiment files, the user receives an error:

arduino

cannot execute [Argument list too long]

Which of the following should the user execute to remove these files?

Options:

A.

find . -name "experiment*.txt" -exec rm "{}" ;

B.

rm -rf experiment*.txt

C.

rm --force experiment*.txt

D.

for i in experiment*.txt; do find . -name $i -exec rmdir "{}" ; done

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Questions 38

A developer needs to launch an Nginx image container, name it Web001, and ex-pose port 8080 externally while mapping to port 80 inside the container. Which of the following commands will accomplish this task?

Options:

A.

docker exec —it -p 8080: 80 ——name Web001 nginx

B.

docker load -it -p 8080:80 ——name Web001 nginx

C.

docker run -it -P 8080:80 ——name Web001 nginx

D.

docker pull -it -p 8080:80 —name Web00l nginx

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Questions 39

A Linux administrator is tasked with adding users to the system. However, the administrator wants to ensure the users’ access will be disabled once the project is over. The expiration date should be 2021-09-30. Which of the following commands will accomplish this task?

Options:

A.

sudo useradd -e 2021-09-30 Project_user

B.

sudo useradd -c 2021-09-30 Project_user

C.

sudo modinfo -F 2021-09-30 Project_uses

D.

sudo useradd -m -d 2021-09-30 Project_user

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Questions 40

As part of the requirements for installing a new application, the swappiness parameter needs to be changed to O. This change needs to persist across re-boots and be applied immediately. A Linux systems administrator is performing this change. Which of the following steps should the administrator complete to accomplish this task?

Options:

A.

echo "vm. swappiness—()" >> /etc/sysctl . conf && sysctl —p

B.

echo "vrn. >> / proc/meminfo && sysctl —a

C.

sysctl —v >> / proc/meminfo & & echo "vm. swapiness=0"

D.

sysctl —h "vm. swapiness—O" && echo / etc/vmswapiness

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Questions 41

Which of the following enables administrators to configure and enforce MFA on a Linux system?

Options:

A.

Kerberos

B.

SELinux

C.

PAM

D.

PKI

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Questions 42

A systems administrator is configuring a Linux system so the 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?

Options:

A.

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

B.

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

C.

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

D.

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

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Questions 43

A systems administrator wants to delete app . conf from a Git repository. Which of the following commands will delete the file?

Options:

A.

git tag app. conf

B.

git commit app . conf

C.

git checkout app . conf

D.

git rm app. conf

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Questions 44

Which of the following would significantly help to reduce data loss if more than one drive fails at the same time?

Options:

A.

Server clustering

B.

Load balancing

C.

RAID

D.

VDI

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Questions 45

NO: 66:

An administrator needs to stop a foreground process in between its execution in a terminal. Which of the following should the administrator use?

Options:

A.

Ctrl+D

B.

Ctrl+F

C.

Ctrl+Z

D.

Ctrl+C

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Questions 46

Which of the following commands is used to configure the default permissions for new files?

Options:

A.

setenforce

B.

sudo

C.

umask

D.

chmod

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Questions 47

A systems administrator is troubleshooting a connectivity issue pertaining to access to a system named db.example.com. The system IP address should be 192.168.20.88. The administrator issues the dig command and receives the following output:

The administrator runs grep db.example.com /etc/hosts and receives the following output:

Given this scenario, which of the following should the administrator do to address this issue?

Options:

A.

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.89.

B.

Modify the /etc/network file and change the db.example.com entry to 192.168.20.88.

C.

Modify the /etc/network file and change the db.example.com entry to 192.168.20.89.

D.

Modify the /etc/hosts file and change the db.example.com entry to 192.168.20.88.

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Questions 48

A Linux engineer wants to give read-write-execute permissions for the cloud_users directory to user Oliver. Which of the following commands should the engineer use?

Options:

A.

setfacl -L Oliver/cloud_users

B.

setfacl -x rwx/cloud_users

C.

setfacl -P rwx/cloud_users

D.

setfacl -m u:Oliver/cloud_users

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Questions 49

One leg of an LVM-mirrored volume failed due to the underlying physical volume, and a systems administrator is troubleshooting the issue. The following output has been provided:

Given this scenario, which of the following should the administrator do to recover this volume?

Options:

A.

Reboot the server. The volume will automatically go back to linear mode.

B.

Replace the failed drive and reconfigure the mirror.

C.

Reboot the server. The volume will revert to stripe mode.

D.

Recreate the logical volume.

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Questions 50

A Linux administrator is configuring a log collector agent to monitor logs in /var/log/collector. The agent is reporting that it cannot write to the directory. The agent runs as the logger user account. The administrator runs a few commands and reviews the following output:

makefile

Output 1:

drwxr-xr-x. 1 root root 0 Oct 20:13 collector

Output 2:

file: /var/log/collector

owner: root

group: root

user::rwx

group::r-x

mask::rwx

other::r-x

Output 3:

uid=1010(logger) gid=1010(monitor) groups=1010(monitor)

Which of the following is the best way to resolve the issue?

Options:

A.

setfacl -Rm u:logger/var/log/collector

B.

usermod -aG root logger

C.

chmod 644 /var/log/collector

D.

chown -R logger/var/log

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Questions 51

Using AD Query, the security gateway connections to the Active Directory Domain Controllers using what protocol?

Options:

A.

Windows Management Instrumentation (WMI)

B.

Hypertext Transfer Protocol Secure (HTTPS)

C.

Lightweight Directory Access Protocol (LDAP)

D.

Remote Desktop Protocol (RDP)

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Questions 52

A Linux administrator would like to measure possible packet loss between a workstation and a remote web application that is running on port 443. Which of the following would be the best command for the administrator to use to display this information?

Options:

A.

ping -c 50

B.

tcpdump -p 443

C.

mtr -T -P 443

D.

traceroute -p 443

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Questions 53

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?

Options:

A.

grep -i auto /etc/systemd/journald.conf && systemct1 restart systemd-journald.service

B.

cat /etc/systemd/journald.conf | awk '(print $1,$3)'

C.

sed -i 's/auto/persistent/g' /etc/systemd/journald.conf && sed -i 'persistent/s/ˆ#//q' /etc/systemd/journald.conf

D.

journalctl --list-boots && systemct1 restart systemd-journald.service

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Questions 54

A Linux systems administrator needs to add additional code to code that resides within a repository without changing the original code. Once completed, the additional code will be merged into the main branch. Which of the following commands should the administrator use first?

Options:

A.

git push

B.

git rebase

C.

git tag

D.

git clone

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Questions 55

A Linux administrator is troubleshooting an SSHD issue on a server. Users are receiving error messages stating the connection is refused. Which of the following commands should be used to verify whether the service is listening?

Options:

A.

nslookup

B.

route

C.

netstat

D.

ifconfig

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Questions 56

After trying to install an RPM package unsuccessfully, a systems administrator verifies the integrity of the package's database. The administrator discovers that the database is corrupted and needs to be recreated. Which of the following commands will help accomplish this task?

Options:

A.

rpmdb -D rebuild

B.

rpmdb --initdb

C.

rpmdb --rebuilddb

D.

rpmdb --exportdb

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Questions 57

An administrator thinks that a package was installed using a snap. Which of the following commands can the administrator use to verify this information?

Options:

A.

snap list

B.

snap find

C.

snap install

D.

snap try

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Questions 58

A security team discovers that a web server has been running with elevated privileges and identifies it as a security violation. Which of the following items needs to be added to the webserver.service file to remediate the issue?

Options:

A.

In the [Service] section of the webserver.service file, add User=comptia.

B.

In the [Unit] section of the webserver.service file, add AllowIsolate=true.

C.

In the [Install] section of the webserver.service file, add WantedBy=single.target.

D.

Add After=network.target to the [Install] section of the webserver.service file.

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Questions 59

A network administrator issues the dig ww. comptia. org command and receives an NXDOMAIN response. Which of the following files should the administrator check first?

Options:

A.

/etc/resolv.conf

B.

/etc/hosts

C.

/etc/sysconfig/network-scripts

D.

/etc/nsswitch.conf

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Questions 60

A systems administrator is investigating an issue in which one of the servers is not booting up properly. The journalctl entries show the following:

Which of the following will allow the administrator to boot the Linux system to normal mode quickly?

Options:

A.

Comment out the /opt/app filesystem in /etc/fstab and reboot.

B.

Reformat the /opt/app filesystem and reboot.

C.

Perform filesystem checks on local filesystems and reboot.

D.

Trigger a filesystem relabel and reboot.

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Questions 61

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?

Options:

A.

useradd -d /comptia/projects user02

B.

useradd -m /comptia/projects user02

C.

useradd -b /comptia/projects user02

D.

useradd -s /comptia/projects user02

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Questions 62

While troubleshooting server issues, a Linux systems administrator obtains the following output:

[rootGhost ~]# totalfree -m usedfreesharedbuf f/cache available

Mem:373635988824829

Swap:20471824223

Which of the following best describes the state of the system?

Options:

A.

The system has consumed the system memory and swap space.

B.

The system has enough free memory space.

C.

The system has swap disabled.

D.

The system has allocated enough buffer space.

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Questions 63

A developer reported an incident involving the application configuration file /etc/httpd/conf/httpd.conf that is missing from the server. Which of the following identifies the RPM package that installed the configuration file?

Options:

A.

rpm -qf /etc/httpd/conf/httpd.conf

B.

rpm -ql /etc/httpd/conf/httpd.conf

C.

rpm —query /etc/httpd/conf/httpd.conf

D.

rpm -q /etc/httpd/conf/httpd.conf

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Questions 64

An administrator recently updated the BIND software package and would like to review the default configuration that shipped with this version. Which of the following files should the administrator review?

Options:

A.

/etc/named.conf.rpmnew

B.

/etc/named.conf.rpmsave

C.

/etc/named.conf

D.

/etc/bind/bind.conf

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Questions 65

A Linux administrator copied a Git repository locally, created a feature branch, and committed some changes to the feature branch. Which of the following Git actions should the Linux administrator use to publish the changes to the main branch of the remote repository?

Options:

A.

rebase

B.

tag

C.

commit

D.

push

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Questions 66

A Linux systems administrator receives a notification that one of the server’s filesystems is full. Which of the following commands would help the administrator to identify this filesystem?

Options:

A.

lsblk

B.

fdisk

C.

df -h

D.

du -ah

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Questions 67

A server is experiencing intermittent connection issues. Some connections to the Internet work as intended, but some fail as if there is no connectivity. The systems administrator inspects the server configuration:

Which of the following is MOST likely the cause of the issue?

Options:

A.

An internal-only DNS server is configured.

B.

The IP netmask is wrong for ens3.

C.

Two default routes are configured.

D.

The ARP table contains incorrect entries.

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Questions 68

A Linux administrator is installing a web server and needs to check whether web traffic has already been allowed through the firewall. Which of the following commands should the administrator use to accomplish this task?

Options:

A.

firewalld query-service-http

B.

firewall-cmd --check-service http

C.

firewall-cmd --query-service http

D.

firewalld --check-service http

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Questions 69

A Linux engineer needs to download a ZIP file and wants to set the nice of value to -10 for this new process. Which of the following commands will help to accomplish the task?

Options:

A.

$ nice -v -10 wget https://foo.com/installation.zip

B.

$ renice -v -10 wget https://foo.com/installation.2ip

C.

$ renice -10 wget https://foo.com/installation.zip

D.

$ nice -10 wget https://foo.com/installation.zip

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Questions 70

Joe, a user, is unable to log in to the Linux system. Given the following output:

Which of the following commands would resolve the issue?

Options:

A.

usermod -s /bin/bash joe

B.

pam_tally2 -u joe -r

C.

passwd -u joe

D.

chage -E 90 joe

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Questions 71

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?

Options:

A.

gedit & disown

B.

kill 9 %1

C.

fg %1

D.

bg %1 job name

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Questions 72

A file called testfile has both uppercase and lowercase letters:

$ cat testfile

ABCDEfgH

IJKLmnoPQ

abcdefgH

ijklLMNopq

A Linux administrator is tasked with converting testfile into all uppercase and writing it to a new file with the name uppercase. Which of the following commands will achieve

this task?

Options:

A.

tr '(A-Z}' '{a-z}' < testfile > uppercase

B.

echo testfile | tr "[Z-A]" "[z-a]" < testfile > uppercase

C.

cat testfile | tr '{z-a)' '{Z-A}' < testfile > uppercase

D.

tr '[a-z]' '[A-Z]' < testfile > uppercase

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Questions 73

A junior administrator updated the PostgreSQL service unit file per the data-base administrator's recommendation. The service has been restarted, but changes have not been applied. Which of the following should the administrator run for the changes to take effect?

Options:

A.

Systemct1 get—default

B.

systemct1 daemon—reload

C.

systemct1 enable postgresq1

D.

systemct1 mask postgresq1

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Questions 74

Employees in the finance department are having trouble accessing the file /opt/work/file. All IT employees can read and write the file. Systems administrator reviews the following output:

Which of the following commands would permanently fix the access issue while limiting access to IT and finance department employees?

Options:

A.

chattr +i file

B.

chown it:finance file

C.

chmod 666 file

D.

setfacl -m g:finance:rw file

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Questions 75

A systems administrator created a new directory with specific permissions. Given the following output:

# file: comptia

# owner: root

# group: root

user: : rwx

group :: r-x

other: :---

default:user :: rwx

default:group :: r-x

default:group:wheel: rwx

default:mask :: rwx

default:other ::-

Which of the following permissions are enforced on /comptia?

Options:

A.

Members of the wheel group can read files in /comptia.

B.

Newly created files in /comptia will have the sticky bit set.

C.

Other users can create files in /comptia.

D.

Only root can create files in /comptia.

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Questions 76

A non-privileged user is attempting to use commands that require elevated account permissions, but the commands are not successful. Which of the following most likely needs to be updated?

Options:

A.

/etc/passwd

B.

/etc/shadow

C.

/etc/sudoers

D.

/etc/bashrc

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Questions 77

An administrator runs ping comptia.org. The result of the command is:

ping: comptia.org: Name or service not known

Which of the following files should the administrator verify?

Options:

A.

/etc/ethers

B.

/etc/services

C.

/etc/resolv.conf

D.

/etc/sysctl.conf

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Questions 78

While troubleshooting server issues, a Linux systems administrator obtains the following output:

yaml

total used free shared buff/cache available

Mem: 3736 3538 33 2 48 25

Swap: 2047 1824 223

Which of the following best describes the state of the system?

Options:

A.

The system has consumed the system memory and swap space

B.

The system has enough free memory space

C.

The system has swap disabled

D.

The system has allocated enough buffer space

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Questions 79

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?

Options:

A.

fdisk /dev/mapper/rhel-opt_finapp

B.

xfs_repair /dev/mapper/rhel-opt_finapp

C.

lvcreate -L900G -n opt_finapp rhel

D.

fsck.ext4 /dev/mapper/rhel-opt_finapp

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Questions 80

A Linux user is trying to execute commands with sudo but is receiving the following error:

$ sudo visudo

>>> /etc/sudoers: syntax error near line 28 <<<

sudo: parse error in /etc/sudoers near line 28

sudo: no valid sudoers sources found, quitting

The following output is provided:

# grep root /etc/shadow

root :* LOCK *: 14600 ::::::

Which of the following actions will resolve this issue?

Options:

A.

Log in directly using the root account and comment out line 28 from /etc/sudoers.

B.

Boot the system in single user mode and comment out line 28 from /etc/sudoers.

C.

Comment out line 28 from /etc/sudoers and try to use sudo again.

D.

Log in to the system using the other regular user, switch to root, and comment out line 28 from /etc/sudoers.

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Questions 81

A Linux administrator is tasked with moving files in a database server. The administrator must not overwrite any existing files. Which of the following commands would indicate that the file already exists?

Options:

A.

mv-ifilename/tmp/backup

B.

mv-bfilename/tmp/backup

C.

mv-nfilename/tmp/backup

D.

mv-ffilename/tmp/backup

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Questions 82

A Linux administrator is creating a user that can run the FTP service but cannot log in to the system. The administrator sets /bin/false as a login shell for the user. When the user tries to run the FTP service, it is rejected with an "invalid shell: /bin/false" message. Which of the following is the best way to resolve the issue?

Options:

A.

Change ownership of /bin/false to the FTP user

B.

Add /bin/false entry to the /etc/shells file

C.

Make /bin/false an executable file

D.

Change the user’s default shell to /bin/bash

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Questions 83

An administrator is troubleshooting a database service outage that was reported by a monitoring system. Given the following output:

$ systemctl status mariadb

Oct 20 16:40:45 comptia systemd[1]: mariadb.service: Main process exited, code=killed, status=9/KILL

Oct 20 16:40:45 comptia systemd[1]: mariadb.service: Failed with result 'signal'.

Oct 20 16:40:50 comptia systemd[1]: Stopped MariaDB 10.3 database server.

$ dmesg

[ 1061.491433] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom, task_memcg=/system.slice/mariadb.service, task=mysqld,pid=1981,uid=27

[ 1061.491453] Out of memory: Killed process 1981 (mysqld) total-vm:330668kB, anon-rss:31316kB, file-rss:OkB, shmem-rss:OkB, UID:27 pgtables:324kB oom_score_adj:0

Which of the following is the reason for the outage?

Options:

A.

The administrator sent a kill signal to the database

B.

The server is missing the DMA bus

C.

The database cannot write anything else to the storage

D.

The server does not have enough physical memory

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Questions 84

A user (userA) has reported issues while logging in to the system. The following output has been provided:

bash

Could not chdir to home directory /home/userA: Permission denied

-bash: /home/userA/.bash_profile: Permission denied

# cat /etc/passwd | grep userA

userA:x:1234:3400:userA account:/home/userA/:/bin/bash

# passwd -S userA

userA PS 2022-10-17 1 99999 0 (Password set. SHA512 crypt.)

# groups userA

admin dev usergrp

# ls -lth /home/

drwx------ 7 root admin 9 Jan 17 2019 userA

drwxr-xr-x 4 userC app 9 Jan 23 2020 userC

Which of the following describes the issue userA is having?

Options:

A.

The password for userA is not set

B.

The group for userA is not assigned correctly

C.

The account password for userA has expired

D.

The assigned home directory is not owned by userA

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Questions 85

A Linux engineer finds multiple failed login entries in the security log file for application users. The Linux engineer performs a security audit and discovers a security issue. Given the following:

# grep -iE '*www*|db' /etc/passwd

www-data:x:502:502:www-data:/var/www:/bin/bash

db:x: 505:505:db: /opt/db:/bin/bash

Which of the following commands would resolve the security issue?

Options:

A.

usermod -d /srv/www-data www-data && usermod -d /var/lib/db db

B.

passwd -u www-data && passwd -u db

C.

renice -n 1002 -u 502 && renice -n 1005 -u 505

D.

chsh -s /bin/false www-data && chsh -s /bin/false db

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Questions 86

The development team created a new branch with code changes that a Linux administrator needs to pull from the remote repository. When the administrator looks for the branch in Git, the branch in question is not visible. Which of the following commands should the Linux administrator run to refresh the branch information?

Options:

A.

git fetch

B.

git checkout

C.

git clone

D.

git branch

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Questions 87

A User on a Linux workstation needs to remotely start an application on a Linux server and then forward the graphical display of that application back to the Linux workstation. Which of the following would enable the user to perform this action?

Options:

A.

ssh -X user@server application

B.

ssh -y user@server application

C.

ssh user@server application

D.

ssh -D user@server application

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Questions 88

A systems administrator creates a public key for authentication. Which of the following tools is most suitable to use when uploading the key to the remote

servers?

Options:

A.

scp

B.

ssh-copy-id

C.

ssh-agent

D.

ssh-keyscan

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Questions 89

A Linux administrator needs to set the permissions on a server. The administrator wants to have the files within the directory set to read-write permissions and the directory set to read-write-execute permissions. Which of the following commands should the administrator use?

Options:

A.

chmod 0022

B.

chown 0027

C.

setfacl 0007

D.

umask 0077

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Questions 90

A Linux administrator is implementing a CI/CD process for the company’s internal accounting web application. Which of the following best defines the purpose of this process?

Options:

A.

To automate the process of building, testing, and deploying application components

B.

To perform security penetration tests on deployed applications to identify vulnerabilities

C.

To formalize the approval process of application releases and configuration changes

D.

To leverage code to document the infrastructure, configurations, and dependencies

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Questions 91

NO: 54:

A new hard drive /dev/sdd was added to a server. Which of the following commands will create a partition table with a single partition /dev/sdd1 that consumes the entire disk?

Options:

A.

echo 'type=83' | sudo sfdisk /dev/sdd

B.

sudo sfdisk /dev/sdd -t=83

C.

echo 'auto' | sudo fdisk /dev/sdd

D.

sudo fdisk /dev/sdd -1 -t=83

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Questions 92

Users are reporting that writes on a system configured with SSD drives have been taking longer than expected, but reads do not seem to be affected. A Linux systems administrator is investigating this issue and working on a solution. Which of the following should the administrator do to help solve the issue?

Options:

A.

Run the corresponding command to trim the SSD drives.

B.

Use fsck on the filesystem hosted on the SSD drives.

C.

Migrate to high-density SSD drives for increased performance.

D.

Reduce the amount of files on the SSD drives.

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Questions 93

An administrator is running a web server in a container named WEB, but none of the error output is showing. Which of the following should the administrator use to generate the errors on the container?

Options:

A.

docker-compose inspect WEB

B.

docker logs WEB

C.

docker run --name WEB --volume /dev/stdout:/var/log/nginx/error.log

D.

docker ps WEB -f

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Questions 94

A Linux administrator needs to determine if prerequisites are met. One of the application requirements is to install Perl on a system. Which of the following commands would accomplish this task?

Options:

A.

rpm -Ufperl

B.

rpm -ivperl

C.

rpm -qaperl

D.

rpm -ehperl

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Questions 95

A Linux administrator would like to use systemd to schedule a job to run every two hours. The administrator creates timer and service definitions and restarts the server to load these new configurations. After the restart, the administrator checks the log file and notices that the job is only running daily. Which of the following is MOST likely causing the issue?

Options:

A.

The checkdiskspace.service is not running.

B.

The checkdiskspace.service needs to be enabled.

C.

The OnCalendar schedule is incorrect in the timer definition.

D.

The system-daemon services need to be reloaded.

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Questions 96

When trying to log in remotely to a server, a user receives the following message:

The server administrator is investigating the issue on the server and receives the following outputs:

Which of the following is causing the issue?

Options:

A.

The wrong permissions are on the user’s home directory.

B.

The account was locked out due to three failed logins.

C.

The user entered the wrong password.

D.

The user has the wrong shell assigned to the account.

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Questions 97

A systems administrator is deploying three identical, cloud-based servers. The administrator is using the following code to complete the task:

Which of the following technologies is the administrator using?

Options:

A.

Ansible

B.

Puppet

C.

Chef

D.

Terraform

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Questions 98

A Linux system fails to start and delivers the following error message:

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

Options:

A.

fsck.ext4 /dev/sda1

B.

partprobe /dev/sda1

C.

fdisk /dev/sda1

D.

mkfs.ext4 /dev/sda1

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Questions 99

A systems administrator is tasked with installing GRUB on the legacy MBR of the SATA hard drive. Which of the following commands will help the administrator accomplish this task?

Options:

A.

grub-install /dev/hda

B.

grub-install /dev/sda

C.

grub-install /dev/sr0

D.

grub-install /dev/hd0,0

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Questions 100

A systems administrator made some unapproved changes prior to leaving the company. The newly hired administrator has been tasked with revealing the system to a compliant state. Which of the following commands will list and remove the correspondent packages?

Options:

A.

dnf list and dnf remove last

B.

dnf remove and dnf check

C.

dnf info and dnf upgrade

D.

dnf history and dnf history undo last

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Questions 101

A Linux administrator wants to set the SUID of a file named dev_team.text with 744 access rights. Which of the following commands will achieve this goal?

Options:

A.

chmod 4744 dev_team.txt

B.

chmod 744 --setuid dev_team.txt

C.

chmod -c 744 dev_team.txt

D.

chmod -v 4744 --suid dev_team.txt

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Questions 102

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?

Options:

A.

route -e get to 192.168.1.40 from 10.0.2.15

B.

ip route get 192.163.1.40 from 10.0.2.15

C.

ip route 192.169.1.40 to 10.0.2.15

D.

route -n 192.168.1.40 from 10.0.2.15

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Questions 103

Based on an organization’s new cybersecurity policies, an administrator has been instructed to ensure that, by default, all new users and groups that are created fall within the specified values below.

To which of the following configuration files will the required changes need to be made?

Options:

A.

/etc/login.defs

B.

/etc/security/limits.conf

C.

/etc/default/useradd

D.

/etc/profile

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Questions 104

A systems administrator created a web server for the company and is required to add a tag for the API so end users can connect. Which of the following would the administrator do to complete this requirement?

Options:

A.

hostnamectl status --no-ask-password

B.

hostnamectl set-hostname "$(perl -le "print" "A" x 86)"

C.

hostnamectl set-hostname Comptia-WebNode -H root@192.168.2.14

D.

hostnamectl set-hostname Comptia-WebNode --transient

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Questions 105

A Linux administrator needs to create a new cloud.cpio archive containing all the files from the current directory. Which of the following commands can help to accomplish this task?

Options:

A.

ls | cpio -iv > cloud.epio

B.

ls | cpio -iv < cloud.epio

C.

ls | cpio -ov > cloud.cpio

D.

ls cpio -ov < cloud.cpio

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Questions 106

A systems administrator is implementing a new service task with systems at startup and needs to execute a script entitled test.sh with the following content:

The administrator tries to run the script after making it executable with chmod +x; however, the script will not run. Which of the following should the administrator do to address this issue? (Choose two.)

Options:

A.

Add #!/bin/bash to the bottom of the script.

B.

Create a unit file for the new service in /etc/systemd/system/ with the name helpme.service in the location.

C.

Add #!//bin/bash to the top of the script.

D.

Restart the computer to enable the new service.

E.

Create a unit file for the new service in /etc/init.d with the name helpme.service in the location.

F.

Shut down the computer to enable the new service.

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Questions 107

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?

Options:

A.

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

B.

restorecon -R -v /var/www/html

C.

setenforce 0

D.

setsebool -P httpd_can_network_connect_db on

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Questions 108

As a Systems Administrator, to reduce disk space, you were tasked to create a shell script that does the following:

Add relevant content to /tmp/script.sh, so that it finds and compresses rotated files in /var/log without recursion.

INSTRUCTIONS

Fill the blanks to build a script that performs the actual compression of rotated log files.

If at any time you would like to bring back the initial state of the simulation, please click the Reset All button.

Options:

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Questions 109

A Linux administrator needs to redirect all HTTP traffic temporarily to the new proxy server 192.0.2.25 on port 3128. Which of the following commands will accomplish this task?

Options:

A.

iptables -t nat -D PREROUTING -p tcp --sport 80 -j DNAT - -to-destination 192.0.2.25:3128

B.

iptables -t nat -A PREROUTING -p top --dport 81 -j DNAT –-to-destination 192.0.2.25:3129

C.

iptables -t nat -I PREROUTING -p top --sport 80 -j DNAT –-to-destination 192.0.2.25:3129

D.

iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT –-to-destination 192.0.2.25:3128

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Questions 110

A Linux system is failing to boot with the following error:

Which of the following actions will resolve this issue? (Choose two.)

Options:

A.

Execute grub-install --root-directory=/mnt and reboot.

B.

Execute grub-install /dev/sdX and reboot.

C.

Interrupt the boot process in the GRUB menu and add rescue to the kernel line.

D.

Fix the partition modifying /etc/default/grub and reboot.

E.

Interrupt the boot process in the GRUB menu and add single to the kernel line.

F.

Boot the system on a LiveCD/ISO.

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Questions 111

A developer is trying to install an application remotely that requires a graphical interface for installation. The developer requested assistance to set up the necessary environment variables along with X11 forwarding in SSH. Which of the following environment variables must be set in remote shell in order to launch the graphical interface?

Options:

A.

$RHOST

B.

SETENV

C.

$SHELL

D.

$DISPLAY

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Questions 112

A systems administrator is troubleshooting connectivity issues and trying to find out why a Linux server is not able to reach other servers on the same subnet it is connected to. When listing link parameters, the following is presented:

Based on the output above, which of following is the MOST probable cause of the issue?

Options:

A.

The address ac:00:11:22:33:cd is not a valid Ethernet address.

B.

The Ethernet broadcast address should be ac:00:11:22:33:ff instead.

C.

The network interface eth0 is using an old kernel module.

D.

The network interface cable is not connected to a switch.

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Questions 113

A Linux engineer has been notified about the possible deletion of logs from the file /opt/app/logs. The engineer needs to ensure the log file can only be written into without removing previous entries.

Which of the following commands would be BEST to use to accomplish this task?

Options:

A.

chattr +a /opt/app/logs

B.

chattr +d /opt/app/logs

C.

chattr +i /opt/app/logs

D.

chattr +c /opt/app/logs

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Questions 114

A Linux administrator is troubleshooting an issue in which an application service failed to start on a Linux server. The administrator runs a few commands and gets the following outputs:

Based on the above outputs, which of the following is the MOST likely action the administrator should take to resolve this issue?

Options:

A.

Enable the logsearch.service and restart the service.

B.

Increase the TimeoutStartUSec configuration for the logsearch.sevice.

C.

Update the OnCalendar configuration to schedule the start of the logsearch.service.

D.

Update the KillSignal configuration for the logsearch.service to use TERM.

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Questions 115

A systems administrator is tasked with preventing logins from accounts other than root, while the file /etc/nologin exists. Which of the following PAM modules will accomplish this task?

Options:

A.

pam_login.so

B.

pam_access.so

C.

pam_logindef.so

D.

pam_nologin.so

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Questions 116

A Linux administrator is tasked with creating resources using containerization. When deciding how to create this type of deployment, the administrator identifies some key features, including portability, high availability, and scalability in production. Which of the following should the Linux administrator choose for the new design?

Options:

A.

Docker

B.

On-premises systems

C.

Cloud-based systems

D.

Kubernetes

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Questions 117

A Linux administrator is scheduling a system job that runs a script to check available disk space every hour. The Linux administrator does not want users to be able to start the job. Given the following:

The Linux administrator attempts to start the timer service but receives the following error message:

Which of the following is MOST likely the reason the timer will not start?

Options:

A.

The checkdiskspace.timer unit should be enabled via systemct1.

B.

The timers.target should be reloaded to get the new configuration.

C.

The checkdiskspace.timer should be configured to allow manual starts.

D.

The checkdiskspace.timer should be started using the sudo command.

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Questions 118

A systems administrator installed a new software program on a Linux server. When the systems administrator tries to run the program, the following message appears on the screen.

Which of the following commands will allow the systems administrator to check whether the system supports virtualization?

Options:

A.

dmidecode -s system-version

B.

lscpu

C.

sysctl -a

D.

cat /sys/device/system/cpu/possible

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Questions 119

After listing the properties of a system account, a systems administrator wants to remove the expiration date of a user account. Which of the following commands will accomplish this task?

Options:

A.

chgrp system accountname

B.

passwd –s accountname

C.

chmod -G system account name

D.

chage -E -1 accountname

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Questions 120

A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

The following output is returned

Which of the following is MOST likely the issue?

Options:

A.

The service does not have permissions to read write the startupfile.

B.

The service startupfile size cannot be 81k.

C.

The service startupfile cannot be owned by root.

D.

The service startupfile should not be owned by the root group.

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Exam Code: XK0-005
Exam Name: CompTIA Linux+ Exam
Last Update: Apr 1, 2025
Questions: 401
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