CompTIA Linux+ XK0-005 Study Guide Updated - Pass Exam Successfully

CompTIA Linux+ XK0-005 Study Guide Updated – Pass Exam Successfully

Eleanor2022-10-31T07:36:27+00:00

ITPrepare gives a quick and industrial-recognized way to pass your CompTIA Linux+ certification exam. The updated CompTIA Linux+ XK0-005 study guide is available online with real exam questions and answers based on the latest CompTIA Linux+ exam objectives. The CompTIA Linux+ XK0-005 exam dumps of ITPrepare are the real CompTIA XK0-005 questions and answers that will repeat in the upcoming XK0-005 exam and you can quickly solve all questions before time.

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1. A systems engineer is adding a new 1GB XFS filesystem that should be temporarily mounted under /ops/app.

Which of the following is the correct list of commands to achieve this goal?

A)

Option A

Option B

Option C

Option D

2. 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?

$RHOST

SETENV

$SHELL

$DISPLAY

3. A Linux administrator created the directory /project/access2all. By creating this directory, the administrator is trying to avoid the deletion or modification of files from non-owners.

Which of the following will accomplish this goal?

chmod +t /project/access2all

chmod +rws /project/access2all

chmod 2770 /project/access2all

chmod ugo+rwx /project/access2all

4. A Linux system is failing to start due to issues with several critical system processes.

Which of the following options can be used to boot the system into the single user mode? (Choose two.)

Execute the following command from the GRUB rescue shell: mount -o remount, ro/sysroot.

Interrupt the boot process in the GRUB menu and add systemd.unit=single in the kernel line.

Interrupt the boot process in the GRUB menu and add systemd.unit=rescue.target in the kernel line.

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

Interrupt the boot process in the GRUB menu and add init=/bin/bash in the kernel line.

Interrupt the boot process in the GRUB menu and add systemd.unit=single.target in the kernel line.

5. 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?

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

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

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

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

6. 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?

hostnamectl status --no-ask-password

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

hostnamectl set-hostname Comptia-WebNode -H [email protected]

hostnamectl set-hostname Comptia-WebNode --transient

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

Kubernetes

Ansible

Podman

Terraform

8. A Linux administrator modified the SSH configuration file.

Which of the following commands should be used to apply the configuration changes?

systemctl stop sshd

systemctl mask sshd

systemctl reload sshd

systemctl start sshd

9. A cloud engineer needs to launch a container named web-01 in background mode.

Which of the following commands will accomplish this task''

docker builder -f ―name web-01 httpd

docker load --name web-01 httpd

docker ps -a --name web-01 httpd

docker run -d --name web-01 httpd

10. 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?

Docker

On-premises systems

Cloud-based systems

Kubernetes

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11. 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?

/etc/named.conf.rpmnew

/etc/named.conf.rpmsave

/etc/named.conf

/etc/bind/bind.conf

12. A systems administrator is notified that the mysqld process stopped unexpectedly.

The systems administrator issues the following command:

sudo grep Ci -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).

free -h

nc -v 127.0.0.1 3306

renice -15 $( pidof mysql )

lsblk

killall -15

vmstat -a 1 4

13. Which of the following commands will display the operating system?

uname -n

uname -s

uname -o

uname -m

14. A systems administrator is encountering performance issues. The administrator runs 3 commands with the following output

The Linux server has the following system properties

CPU: 4 vCPU

Memory: 50GB

Which of the following accurately describes this situation?

The system is under CPU pressure and will require additional vCPUs

The system has been running for over a year and requires a reboot.

Too many users are currently logged in to the system

The system requires more memory

15. A Linux administrator needs to remove software from the server.

Which of the following RPM options should be used?

rpm -s

rm -d

rpm -q

rpm -e

16. 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?

restorecon .ssh/authorized_keys

ssh_keygen -t rsa -o .ssh/authorized_keys

chown root:root .ssh/authorized_keys

chmod 600 .ssh/authorized_keys

17. After installing some RPM packages, a systems administrator discovers the last package that was installed was not needed.

Which of the following commands can be used to remove the package?

dnf remove packagename

apt-get remove packagename

rpm -i packagename

apt remove packagename

18. A systems administrator is tasked with creating an Ansible playbook to automate the installation of patches on several Linux systems.

In which of the following languages should the playbook be written?

SQL

YAML

HTML

JSON

19. A cloud engineer is installing packages during VM provisioning.

Which of the following should the engineer use to accomplish this task?

Cloud-init

Bash

Docker

Sidecar

20. A Linux administrator needs to correct the permissions of a log file on the server.

Which of the following commands should be used to set filename.log permissions to -rwxr―r--. ?

chmod 755 filename.log

chmod 640 filename.log

chmod 740 filename.log

chmod 744 filename.log

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21. 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?

/etc/login.defs

/etc/security/limits.conf

/etc/default/useradd

/etc/profile

22. A Linux engineer receives reports that files created within a certain group are being modified by users who are not group members. The engineer wants to reconfigure the server so that only file owners and group members can modify new files by default.

Which of the following commands would accomplish this task?

chmod 775

umask 002

chactr -Rv

chown -cf

23. Several users reported that they were unable to write data to the /oracle1 directory.

The following output has been provided:

Which of the following commands should the administrator use to diagnose the issue?

df -i /oracle1

fdisk -1 /dev/sdb1

lsblk /dev/sdb1

du -sh /oracle1

24. 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?

chmod 4744 dev_team.txt

chmod 744 --setuid dev_team.txt

chmod -c 744 dev_team.txt

chmod -v 4744 --suid dev_team.txt

25. A cloud engineer needs to change the secure remote login port from 22 to 49000.

Which of the following files should the engineer modify to change the port number to the desired value?

/etc/host.conf

/etc/hostname

/etc/services

/etc/ssh/sshd_config

26. A Linux administrator has set up a new DNS forwarder and is configuring all internal servers to use the new forwarder to look up external DNS requests. The administrator needs to modify the firewall on the server for the DNS forwarder to allow the internal servers to communicate to it and make the changes persistent between server reboots.

Which of the following commands should be run on the DNS forwarder server to accomplish this task?

ufw allow out dns

systemctl reload firewalld

iptables -A OUTPUT -p udp -ra udp -dport 53 -j ACCEPT

flrewall-cmd --zone-public --add-port-53/udp --permanent

27. A Linux user reported the following error after trying to connect to the system remotely:

ssh: connect to host 10.0.1.10 port 22: Resource temporarily unavailable

The Linux systems administrator executed the following commands in the Linux system while trying to diagnose this issue:

Which of the following commands will resolve this issue?

firewall-cmd --zone=public --permanent --add-service=22

systemctl enable firewalld; systemctl restart firewalld

firewall-cmd --zone=public --permanent --add-service=ssh

firewall-cmd --zone=public --permanent --add-port=22/udp

28. 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

29. A systems administrator wants to be sure the sudo rules just added to /etc/sudoers are valid.

Which of the following commands can be used for this task?

visudo -c

test -f /etc/sudoers

sudo vi check

cat /etc/sudoers | tee test

30. Developers have requested implementation of a persistent, static route on the application server. Packets sent over the interface eth0 to 10.0.213.5/32 should be routed via 10.0.5.1.

Which of the following commands should the administrator run to achieve this goal?

route -i etho -p add 10.0.213.5 10.0.5.1

route modify eth0 +ipv4.routes "10.0.213.5/32 10.0.5.1"

echo "10.0.213.5 10.0.5.1 eth0" > /proc/net/route

ip route add 10.0.213.5/32 via 10.0.5.1 dev eth0

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31. 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.

32. Which of the following is a function of a bootloader?

It initializes all the devices that are required to load the O

It mounts the root filesystem that is required to load the O

It helps to load the different kernels to initiate the OS startup process.

It triggers the start of all the system services.

33. 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?

lsblk

fdisk

df -h

du -ah

34. 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?

dnf list and dnf remove last

dnf remove and dnf check

dnf info and dnf upgrade

dnf history and dnf history undo last

35. A new Linux systems administrator just generated a pair of SSH keys that should allow connection to the servers.

Which of the following commands can be used to copy a key file to remote servers? (Choose two.)

wget

ssh-keygen

ssh-keyscan

ssh-copy-id

ftpd

scp

36. A Linux administrator recently downloaded a software package that is currently in a compressed file.

Which of the following commands will extract the files?

unzip -v

bzip2 -z

gzip

funzip

37. A user generated a pair of private-public keys on a workstation.

Which of the following commands will allow the user to upload the public key to a remote server and enable passwordless login?

scp ~/.ssh/id_rsa user@server:~/

rsync ~ /.ssh/ user@server:~/

ssh-add user server

ssh-copy-id user@server

38. A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure.

Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?

docker export <container_id>

docker info <container_id>

docker start <container_id>

docker inspect <container_id>

39. 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?

semanage port -d -t http_port_t -p tcp 6379

semanage port -a -t http_port_t -p tcp 6379

semanage port -a http_port_t -p top 6379

semanage port -l -t http_port_tcp 6379

40. A systems administrator pressed Ctrl+Z after starting a program using the command line, and the shell prompt was presented.

In order to go back to the program, which of the following commands can the administrator use?

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41. 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?

An internal-only DNS server is configured.

The IP netmask is wrong for ens3.

Two default routes are configured.

The ARP table contains incorrect entries.

42. 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?

chattr +a /opt/app/logs

chattr +d /opt/app/logs

chattr +i /opt/app/logs

chattr +c /opt/app/logs

43. 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/ˆ#//q' /etc/systemd/journald.conf

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

44. 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

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

/etc/systemd/journald.conf

/etc/systemd/systemd-journalctl.conf

/usr/lib/systemd/journalctl.conf

/etc/systemd/systemd-journald.conf

46. Users have been unable to reach www.comptia.org from a Linux server.

A systems administrator is troubleshooting the issue and does the following:

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

The name www.comptia.org does not point to a valid IP address.

The server 192.168.168.53 is unreachable.

No default route is set on the server.

The network interface eth0 is disconnected.

47. 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

48. 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?

pam_login.so

pam_access.so

pam_logindef.so

pam_nologin.so

49. A systems administrator is tasked with setting up key-based SSH authentication.

In which of the following locations should the administrator place the public keys for the server?

~/.sshd/authkeys

~/.ssh/keys

~/.ssh/authorized_keys

~/.ssh/keyauth

50. 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?

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

sysctl -w net.ipv4.ip_forward=1

firewall-cmd --enable ipv4_forwarding

systemctl start ipv4_forwarding

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51. A user is asking the systems administrator for assistance with writing a script to verify whether a file exists.

Given the following:

Which of the following commands should replace the <CONDITIONAL> string?

if [ -f "$filename" ]; then

if [ -d "$filename" ]; then

if [ -f "$filename" ] then

if [ -f "$filename" ]; while

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

Virtual private network

Sidecar pod

Overlay network

Service mesh

53. Some servers in an organization have been compromised. Users are unable to access to the organization’s web page and other services.

While reviewing the system log, a systems administrator notices messages from the kernel regarding firewall rules:

Which of the following commands will remediate and help resolve the issue?

A)

Option A

Option B

Option C

Option D

54. 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

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

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

fsck.ext4 /dev/sda1

partprobe /dev/sda1

fdisk /dev/sda1

mkfs.ext4 /dev/sda1

56. An administrator accidentally deleted the /boot/vmlinuz file and must resolve the issue before the server is rebooted.

Which of the following commands should the administrator use to identify the correct version of this file?

rpm -qa | grep kernel; uname -a

yum -y update; shutdown -r now

cat /etc/centos-release; rpm -Uvh --nodeps

telinit 1; restorecon -Rv /boot

57. 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.

58. A Linux administrator needs to create an image named sda.img from the sda disk and store it in the /tmp directory.

Which of the following commands should be used to accomplish this task?

dd of=/dev/sda if=/tmp/sda.img

dd if=/dev/sda of=/tmp/sda.img

dd --if=/dev/sda --of=/tmp/sda.img

dd --of=/dev/sda --if=/tmp/sda.img

59. A Linux system is failing to boot.

The following error is displayed in the serial console:

[[1;33mDEPEND[Om] Dependency failed for /data.

[[1;33mDEPEND[Om] Dependency failed for Local File Systems

...

Welcome to emergency mode! After logging in, type "journalctl -xb" to viewsystem logs, "systemctl reboot" to reboot, "systemctl default" to try again to boot into default mode.

Give root password for maintenance

(or type Control-D to continue}

Which of the following files will need to be modified for this server to be able to boot again?

/etc/mtab

/dev/sda

/etc/fstab

/ete/grub.conf

60. 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?

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

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

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

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

CompTIA Linux+ XK0-005 Study Guide Updated – Pass Exam Successfully