XK0-005 practice questions 21–30

1. Question 21 · 300 in bank

   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?

   • A/etc/mtab
   • B/dev/sda
   • C/etc/fstab
   • D/ete/grub.conf

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   Answer: C

   Explanation

   Based on the error message and symptoms described, the file that needs to be modified for this server to be able to boot again is option C, /etc/fstab. The error message indicates that the system is failing to start the /data partition, which is causing the system to go into emergency mode and preventing it from booting. The /data partition is most likely defined in the /etc/fstab file, which contains information about the file systems that are mounted at boot time.

   Source: Adapted from community discussion — linux_admin

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2. Question 22 · 300 in bank

   A systems administrator frequently connects to a remote host via SSH and a non-standard port. The systems administrator would like to avoid passing the port parameter on the command line every time. Which of the following files can be used to set a different port value for that host?

   • A/etc/ssh/sshd_config
   • B/etc/ssh/moduli
   • C~/.ssh/config
   • D~/.ssh/authorized_keys

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   Answer: C

   Explanation

   The file that can be used to set a different port value for a specific remote host in SSH is option C, ~/.ssh/config. The ~/.ssh/config file is a per-user configuration file that SSH reads before connecting to a remote host. It allows users to set various SSH options for specific hosts, eliminating the need to pass these options on the command line every time.

   Source: Adapted from community discussion — linux_admin

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3. Question 23 · 300 in bank

   A Linux administrator modified the SSH configuration file. Which of the following commands should be used to apply the configuration changes?

   • Asystemctl stop sshd
   • Bsystemctl mask sshd
   • Csystemctl reload sshd
   • Dsystemctl start sshd

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   Answer: C

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4. Question 24 · 300 in bank

   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?

   • Adocker run -ti app /bin/sh
   • Bpodman exec -ti app /bin/sh
   • Cpodman run -d app /bin/bash
   • Ddocker exec -d app /bin/bash

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   Answer: B

   Explanation

   B. podman exec -ti app /bin/sh The podman exec command allows a Linux administrator to enter a running container and perform operations inside the container. The -ti options specify that the administrator wants to run the command interactively with a TTY and with STDIN attached. The app in the command specifies the name or ID of the running container that the administrator wants to enter. The /bin/sh at the end of the command specifies the shell to use inside the container.

   Source: Adapted from community discussion — linux_admin

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5. Question 25 · 300 in bank

   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?

   • Aifconfig hw eth1
   • Bnetstat -r eth1
   • Css -ti eth1
   • Dip link show eth1

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   Answer: D

   Explanation

   looks like ip link show is the correct command as netstat -r is meant to view route information, and not the status of a network interface

   Source: Adapted from community discussion — Ckl22

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6. Question 26 · 300 in bank

   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?

   • A~/.sshd/authkeys
   • B~/.ssh/keys
   • C~/.ssh/authorized_keys
   • D~/.ssh/keyauth

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   Answer: C

   Explanation

   The location where the systems administrator should place the public keys for the server to set up key-based SSH authentication is option C, ~/.ssh/authorized_keys. The authorized_keys file is located in the .ssh directory in the home directory of the user account that is being used to log in to the remote server. This file contains a list of public keys that are allowed to authenticate the user when logging in to the server via SSH. To set up key-based SSH authentication, the systems administrator should copy the public key(s) of the user(s) to the remote server's authorized_keys file using a secure method such as scp. Once the public key(s) have been added to the file, the user(s) should be able to log in to the server using their corresponding private key(s) without being prompted for a password.

   Source: Adapted from community discussion — linux_admin

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7. Question 27 · 300 in bank

   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?

   • Auseradd -d /comptia/projects user02
   • Buseradd -m /comptia/projects user02
   • Cuseradd -b /comptia/projects user02
   • Duseradd -s /comptia/projects user02

   Show answer

   Answer: A

   Explanation

   Answer is A -d, --home HOME_DIR The new user is created using HOME_DIR as the value for the user's login directory. The default is too append the LOGIN name to BASE_DIR and use that as the login directory name. The directory HOME_DIR does not have to exist but is not created if it's missing. -b, --base-dir BASE_DIR https://www.computerhope.com/unix/useradd.htm

   Source: Adapted from community discussion — Ckl22

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8. Question 28 · 300 in bank

   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?

   • AReboot the server. The volume will automatically go back to linear mode.
   • BReplace the failed drive and reconfigure the mirror.
   • CReboot the server. The volume will revert to stripe mode.
   • DRecreate the logical volume.

   Show answer

   Answer: B

   Explanation

   To recover an LVM-mirrored volume after a failure in one of its physical volumes, the systems administrator should replace the failed drive and reconfigure the mirror. Therefore, the correct option is B. LVM mirroring provides redundancy by creating an identical copy of a logical volume on another physical volume. If one of the physical volumes fails, the system can continue to function using the copy on the remaining volume. To recover the volume, the failed physical volume should be replaced and the mirror should be reconfigured to ensure redundancy is restored. Depending on the configuration of the volume, the system may need to be rebooted to recognize the new physical volume.

   Source: Adapted from community discussion — linux_admin

   References

   • Red Hat documentation

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9. Question 29 · 300 in bank

   A systems administrator created a new Docker image called test. After building the image, the administrator forgot to version the release. Which of the following will allow the administrator to assign the v1 version to the image?

   • Adocker image save test test:v1
   • Bdocker image build test:vl
   • Cdocker image tag test test:vl
   • Ddocker image version test:v1

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   Answer: C

   Explanation

   To assign a version to a Docker image that has already been built and tagged, the systems administrator should use the docker image tag command. Therefore, the correct option is C, docker image tag test test:v1. The docker image tag command is used to assign a new tag (including a version number) to an existing Docker image.

   Source: Adapted from community discussion — linux_admin

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10. Question 30 · 300 in bank

    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?

    • Alsblk
    • Bfdisk
    • Cdf -h
    • Ddu -ah

    Show answer

    Answer: C

    Explanation

    To identify the filesystem that is full, the Linux systems administrator can use the df -h command. Therefore, the correct option is C, df -h. The df (disk free) command is used to report the amount of free and used disk space on a filesystem. The -h option displays the output in a human-readable format, making it easier to read.

    Source: Adapted from community discussion — linux_admin

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XK0-005 practice, question 21. 300 questions available.