XK0-005 practice questions 241–250

1. Question 241 · 300 in bank

   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?

   • Avisudo -c
   • Btest -f /etc/sudoers
   • Csudo vi check
   • Dcat /etc/sudoers | tee test

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   Answer: A

   Explanation

   A. visudo -c The visudo command is used to edit the /etc/sudoers file, and the -c option is used to check the syntax of the file without actually making any changes to it. If there are any syntax errors in the file, visudo will return an error message and prevent the changes from being saved. So, the command "visudo -c" can be used to validate the sudo rules in /etc/sudoers. Option B "test -f /etc/sudoers" checks if the file /etc/sudoers exists, but it does not validate the syntax of the file. Option C "sudo vi check" opens the file "check" with the vi editor, but it does not relate to the /etc/sudoers file. Option D "cat /etc/sudoers | tee test" displays the contents of the /etc/sudoers file and saves it to a file named "test", but it does not validate the syntax of the file.

   Source: Adapted from community discussion — linux_admin

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2. Question 242 · 300 in bank

   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?

   • Ascp ~/.ssh/id_rsa user@server:~/
   • Brsync ~ /.ssh/ user@server:~/
   • Cssh-add user server
   • Dssh-copy-id user@server

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   Answer: D

   Explanation

   D is the correct command but is missing the path to the public key that is to be copied over $ ssh-copy-id -i ~/.ssh/id_rsa.pub user@host_address

   Source: Adapted from community discussion — Ckl22

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3. Question 243 · 300 in bank

   A Linux administrator created a new file system. Which of the following files must be updated to ensure the filesystem mounts at boot time?

   • A/etc/sysctl
   • B/etc/filesystems
   • C/etc/fstab
   • D/etc/nfsmount.conf

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   Answer: C

   Explanation

   C. /etc/fstab The /etc/fstab file is used to specify the file systems that are mounted at boot time in Linux. The administrator must add an entry for the new file system to this file, which includes information such as the file system device, mount point, file system type, and mount options. This information is used by the mount command to mount the file system at boot time.

   Source: Adapted from community discussion — linux_admin

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4. Question 244 · 300 in bank

   A Linux administrator is troubleshooting a memory-related issue. Based on the output of the commands:

   

   Which of the following commands would address the issue?

   • Atop -p 8321
   • Bkill -9 8321
   • Crenice -10 8321
   • Dfree 8321

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   Answer: B

   Explanation

   B. kill -9 8321 If a process is causing memory issues, it may be necessary to terminate the process. The "kill" command is used to send signals to processes, and the -9 option sends the SIGKILL signal, which terminates the process immediately. By using the command "kill -9 8321", the administrator can terminate the process causing memory issues.

   Source: Adapted from community discussion — linux_admin

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5. Question 245 · 300 in bank

   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?

   • Adnf list and dnf remove last
   • Bdnf remove and dnf check
   • Cdnf info and dnf upgrade
   • Ddnf history and dnf history undo last

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   Answer: D

   Explanation

   D. dnf history and dnf history undo last The "dnf history" command displays the history of all transactions performed using the DNF package manager, including package installs, upgrades, and removals. The "dnf history undo last" command undoes the last transaction, effectively removing the package that was installed. By using these two commands, the systems administrator can reveal the system to a compliant state by removing the unapproved packages. Option A "dnf list and dnf remove last" lists the packages installed on the system, but it does not undo the last transaction. The "dnf remove last" command is not a valid command.

   Source: Adapted from community discussion — linux_admin

   References

   • Red Hat documentation

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6. Question 246 · 300 in bank

   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?

   • Arestorecon .ssh/authorized_keys
   • Bssh_keygen -t rsa -o .ssh/authorized_keys
   • Cchown root:root .ssh/authorized_keys
   • Dchmod 600 .ssh/authorized_keys

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   Answer: A

   Explanation

   "restorecon" is a command in SELinux (Security-Enhanced Linux) that is used to reset the security context of a file to its default SELinux security context. The "restorecon" command can be useful in cases where the SELinux security context of a file has been altered or changed, causing issues with the file's behavior or access. The "restorecon .ssh/authorized_keys" command specifically resets the security context of the "authorized_keys" file in the ".ssh" directory to its default SELinux security context. This can be useful in cases where the SELinux security context of the "authorized_keys" file has been altered, causing issues with SSH authentication.

   Source: Adapted from community discussion — linux_admin

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7. Question 247 · 300 in bank

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

   • Adocker images prune -a
   • Bdocker push images -a
   • Cdocker rmi -a images
   • Ddocker images rmi --all

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   Answer: A

   Explanation

   A. docker images prune -a The "docker images prune -a" command will remove all dangling images, which are images that are not associated with any existing containers, as well as all images that do not have an associated container. The "-a" option specifies that all images should be removed, regardless of whether they are in use or not.

   Source: Adapted from community discussion — linux_admin

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8. Question 248 · 300 in bank

   Select 2

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

   

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

   • AExecute grub-install --root-directory=/mnt and reboot.
   • BExecute grub-install /dev/sdX and reboot.
   • CInterrupt the boot process in the GRUB menu and add rescue to the kernel line.
   • DFix the partition modifying /etc/default/grub and reboot.
   • EInterrupt the boot process in the GRUB menu and add single to the kernel line.
   • FBoot the system on a LiveCD/ISO.

   Show answer

   Answer: BF

   Explanation

   Option F "Boot the system on a LiveCD/ISO" would help along with option B, as booting the system on a LiveCD/ISO would allow the administrator to access the file system and make necessary changes to fix the issue. Additionally, the administrator could use the bootable LiveCD/ISO to run the grub-install command with the appropriate arguments, such as "/dev/sdX" (Option B), to install GRUB on the appropriate disk. This would help resolve the issue with the missing partition and allow the system to boot properly.

   Source: Adapted from community discussion — linux_admin

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9. Question 249 · 300 in bank

   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?

   • Add of=/dev/sda if=/tmp/sda.img
   • Bdd if=/dev/sda of=/tmp/sda.img
   • Cdd --if=/dev/sda --of=/tmp/sda.img
   • Ddd --of=/dev/sda --if=/tmp/sda.img

   Show answer

   Answer: B

   Explanation

   The correct command is B: dd if=/dev/sda of=/tmp/sda.img. The dd command is used to create an image of a disk or partition, and the syntax is as follows: dd if=input-file of=output-file. In this case, the input file is the sda disk /dev/sda and the output file is the image file in the /tmp directory /tmp/sda.img.

   Source: Adapted from community discussion — linux_admin

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10. Question 250 · 300 in bank

    Which of the following technologies can be used as a central repository of Linux users and groups?

    • ALDAP
    • BMFA
    • CSSO
    • DPAM

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    Answer: A

    Explanation

    LDAP (Lightweight Directory Access Protocol): A protocol used to access and maintain distributed directory information services over a network. It is commonly used for authentication and managing user information in enterprise environments. MFA (Multi-factor Authentication): A security process in which a user is required to provide two or more verification factors to gain access to a resource, such as a website or application. These factors typically include something the user knows (password), something the user has (a mobile phone or token), and something the user is (fingerprint or other biometrics). SSO (Single Sign-On): A user authentication process that allows a user to access multiple applications with a single set of login credentials. This reduces the need to remember multiple passwords and improves user convenience. PAM (Pluggable Authentication Module): A framework that allows system administrators to configure authentication methods for applications on Unix-like systems. It enables the integration of different authentication technologies (like password-based, biometrics, or MFA) without changing the applications themselves.

    Source: Adapted from community discussion — JSHack

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XK0-005 practice, question 241. 300 questions available.