Free CompTIA XK0-005 Practice Exams

Question #1

A systems administrator needs to clone the partition /dev/sdc1 to /dev/sdd1.

Which of the following commands will accomplish this task?

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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Question #2

A systems administrator made some changes in the ~/.bashrc file and added an alias command. When the administrator tried to use the alias command, it did not work.

Which of the following should be executed FIRST?

A . source ~/.bashrc
B . read ~/.bashrc
C . touch ~/.bashrc
D . echo ~/.bashrc

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Question #3

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?

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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Question #4

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?

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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Question #5

User1 is a member of the accounting group. Members of this group need to be able to execute but not make changes to a script maintained by User2. The script should not be accessible to other users or groups.

Which of the following will give proper access to the script?

A . chown user2:accounting script.sh
chmod 750 script.sh
B . chown user1:accounting script.sh
chmod 777 script.sh
C . chown accounting:user1 script.sh
chmod 057 script.sh
D . chown user2:accounting script.sh
chmod u+x script.sh

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Correct Answer: A
A

Explanation:

The commands that will give proper access to the script are:

chown user2:accounting script.sh: This command will change the ownership of the script to user2 as the owner and accounting as the group. The chown command is a tool for changing the owner and group of files and directories on Linux systems. The user2:accounting is the user and group name that the command should assign to the script. The script.sh is the name of the script that the command should modify. The command chown user2:accounting script.sh will ensure that user2 is the owner of the script and accounting is the group of the script, which will allow user2 to maintain the script and the accounting group to access the script.

chmod 750 script.sh: This command will change the permissions of the script to 750, which means read, write, and execute for the owner; read and execute for the group; and no access for others. The chmod command is a tool for changing the permissions of files and directories on Linux systems. The permissions are represented by three digits in octal notation, where each digit corresponds to the owner, group, and others. Each digit can have a value from 0 to 7, where each value represents a combination of read, write, and execute permissions. The 750 is the permission value that the command should assign to the script. The script.sh is the name of the script that the command should modify. The command chmod 750 script.sh will ensure that only the owner and the group can execute the script, but not make changes to it, and that the script is not accessible to other users or groups.

The commands that will give proper access to the script are chown user2:accounting script.sh and chmod 750 script.sh. This is the correct answer to the question. The other options are incorrect because they either do not give proper access to the script (chown user1:accounting script.sh or chown accounting:user1 script.sh) or do not change the permissions of the script (chmod 777 script.sh or chmod u+x script.sh).

Reference: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Managing File Permissions and Ownership, pages 346-348.

Question #6

A systems administrator is tasked with mounting a USB drive on a system. The USB drive has a single partition, and it has been mapped by the system to the device /dev/sdb.

Which of the following commands will mount the USB to /media/usb?

A . mount /dev/sdb1 /media/usb
B . mount /dev/sdb0 /media/usb
C . mount /dev/sdb /media/usb
D . mount -t usb /dev/sdb1 /media/usb

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Question #7

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.)

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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Question #8

Which of the following is a function of a bootloader?

A . It initializes all the devices that are required to load the OS.
B . It mounts the root filesystem that is required to load the OS.
C . It helps to load the different kernels to initiate the OS startup process.
D . It triggers the start of all the system services.

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Question #9

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?

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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Question #10

A systems administrator is compiling a report containing information about processes that are listening on the network ports of a Linux server.

Which of the following commands will allow the administrator to obtain the needed information?

A . ss -pint
B . tcpdump -nL
C . netstat -pn
D . lsof -It

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