CompTIA XK0-005 Online Practice Questions and Exam Preparation

CompTIA XK0-005 Online Questions & Answers

• Question 71:

  Which of the following should be used to verify the integrity of a file?

  A. sha256sum
  B. fsck
  C. gpg --d
  D. hashcat
  A. sha256sum

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  Explanation

  The best tool to use to verify the integrity of a file is A. sha256sum. This tool will compute and display the SHA-256 hash of a file, which is a 64-digit hexadecimal number that uniquely identifies the file's content. By comparing the hash of a downloaded file with the hash provided by the file owner or source, you can confirm that the file has not been altered or corrupted during the transfer. The other tools are either not relevant or not suitable for this task. For example:

  B. fsck is a tool for checking and repairing the file system, but it does not verify the integrity of individual files.

  C. gpg -d is a tool for decrypting files that have been encrypted with GnuPG, but it does not verify the integrity of unencrypted files.

  D. hashcat is a tool for cracking passwords or hashes, but it does not verify the integrity of files.

• Question 72:

  An administrator made a change to a system's network configuration.

  Which of the following best represents what the administrator should do to have the new configuration take effect?

  A. systemctl restart networkd
  B. systemctl enable networkd
  C. systemctl status networkd
  D. systemctl isolate networkd
  A. systemctl restart networkd

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  Explanation

  The command systemctl restart networkd is used to apply new network configurations by restarting the network service. This ensures that any changes made to network settings (such as IP addresses, routes, or DNS settings) take effect without requiring a system reboot.

• Question 73:

  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?

  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
  B. podman exec -ti app /bin/sh

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  Explanation

  Podman exec -ti app /bin/sh allows the Linux administrator to enter the running container and analyze the logs that are stored inside. This command uses the podman tool, which is a daemonless container engine that can run and manage containers on Linux systems. The exec option executes a command inside an existing container, in this case app, which is the name of the container that runs the failing application. The -ti option allocates a pseudo-TTY and keeps STDIN open, allowing for interactive shell access to the container. The /bin/sh argument specifies the shell command to run inside the container, which can be used to view and manipulate the log files. The other options are not correct commands for entering a running container and analyzing the logs. Docker run -ti app /bin/sh creates a new container from the app image and runs the /bin/sh command inside it, but does not enter the existing container that runs the failing application. Podman run -d app /bin/bash also creates a new container from the app image and runs the /bin/bash command inside it, but does so in detached mode, meaning that it runs in the background without interactive shell access. Docker exec -d app /bin/bash executes the /bin/bash command inside the existing app container, but also does so in detached mode, without interactive shell access.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 18: Automating Tasks; View container logs | Docker Docs; How to see the logs of a docker container - Stack Overflow

• Question 74:

  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?

  A. lsblk
  B. fdisk
  C. df -h
  D. du -ah
  C. df -h

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  Explanation

  The df -h command can be used to identify the filesystem that is full. This command displays the disk usage of each mounted filesystem in a human-readable format, showing the total size, used space, available space, and percentage of each filesystem. The lsblk command displays information about block devices, not filesystems. The fdisk command can be used to manipulate partition tables, not check disk usage. The du -ah command displays the disk usage of each file and directory in a human-readable format, not the filesystems.

  References: [CompTIA Linux+ (XK0-005) Certification Study Guide], Chapter 14: Managing Disk Storage, page 454.

• Question 75:

  A Linux administrator wants to verify the runtime parameters of a container's ENTRYPOINT process. Which of the following commands will allow the administrator to achieve this goal?

  A. docker inspect container
  B. docker ls container
  C. docker ps container
  D. docker logs container
  A. docker inspect container

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  Explanation

• Question 76:

  A Linux administrator was informed that the server time zone is incorrect.

  Which of the following commands should the administrator use to correct the time zone?

  A. timedatectl set-timezone America/New_York
  B. systemd-timezone set Asia/Tokyo
  C. systemctl configure-timezone Africa/Nairobi
  D. tzconfig configure Europe/London
  A. timedatectl set-timezone America/New_York

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  Explanation

  In modern Linux distributions using systemd, the correct way to change the system time zone is by using the timedatectl command: cpp CopyEdit timedatectl set-timezone For example, to set the time zone to America/New_York, the command would be: cpp CopyEdit timedatectl set-timezone America/New_York

  References: CompTIA Linux+ Official Documentation

• Question 77:

  A Linux systems administrator needs to compress a file named passwords.txt. The compressed file should be saved as passwords.txt.gz. Which of the following commands should the administrator use to accomplish this task?

  A. gzip -c passwords.txt > passwords.txt.gz
  B. gzip -d passwords.txt | passwords.txt.gz
  C. gzip -n passwords.txt > passwords.txt.gz
  D. gzip -n passwords.txt < passwords.txt.gz
  A. gzip -c passwords.txt > passwords.txt.gz

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  Explanation

  The gzip command with the -c flag outputs the compressed data to standard output, which can then be redirected to create a .gz file. This approach maintains the original file while creating a compressed version.

  Gzip Command Documentation

• Question 78:

  A senior Linux administrator has created several scripts that will be used to install common system applications. These scripts are published to a reposito-ry to share with the systems team. A junior Linux administrator needs to re-trieve the scripts and make them available on a local workstation. Which of the following Git commands should the junior Linux administrator use to accom-plish this task?

  A. fetch
  B. checkout
  C. clone
  D. branch
  C. clone

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  Explanation

  To retrieve the scripts from a repository and make them available on a local workstation, the junior Linux administrator can use the command git clone ? This will create a copy of the repository on the local machine, including all the scripts and history. The other commands will not clone the repository, but either fetch, checkout, or branch from an existing repository.

  References:

  [CompTIA Linux+ Study Guide], Chapter 10: Working with Git, Section: Cloning Repositories with Git

  [How to Clone a Git Repository]

• Question 79:

  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?

  A. df -i /oracle1
  B. fdisk -1 /dev/sdb1
  C. lsblk /dev/sdb1
  D. du -sh /oracle1
  A. df -i /oracle1

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  Explanation

  The administrator should use the command df -i /oracle1 to diagnose the issue of users being unable to write data to the /oracle1 directory. This command will show the inode usage of the /oracle1 filesystem, which indicates how many files and directories can be created on it. If the inode usage is 100%, it means that no more files or directories can be added, even if there is still free space on the disk. The administrator can then delete some unnecessary files or directories, or increase the inode limit of the filesystem, to resolve the issue. The other options are not correct commands for diagnosing this issue. The fdisk -l /dev/sdb1 command will show the partition table of /dev/sdb1, which is not relevant to the inode usage. The lsblk /dev/sdb1 command will show information about /dev/sdb1 as a block device, such as its size, mount point, and type, but not its inode usage. The du -sh /oracle1 command will show the disk usage of /oracle1 in human-readable format, but not its inode usage.

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 7: Managing Disk Storage; How to Check Inode Usage in Linux - Fedingo

• Question 80:

  A systems administrator is checking the system logs. The administrator wants to look at the last 20 lines of a log. Which of the following will execute the command?

  A. tail -v 20
  B. tail -n 20
  C. tail -c 20
  D. tail -l 20
  B. tail -n 20

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  Explanation

  The command tail -n 20 will display the last 20 lines of a file. The -n option specifies the number of lines to show. This is the correct command to execute the task. The other options are incorrect because they either use the wrong options (-v, c, or -l) or have the wrong arguments (20 instead of 20 filename).

  References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Managing Files and Directories, page 352.

  Exam B