CompTIA Linux+ XK0-005 Questions & Answers

• Question 1:

  A user reported issues when trying to log into a Linux server. The following outputs were received:

  

  Given the outputs above, which of the following is the reason the user is unable to log in to the server?

  A. User1 needs to set a long password.

  B. User1 is in the incorrect group.

  C. The user1 shell assignment is incorrect.

  D. The user1 password is expired.

  Correct Answer: B

• Question 2:

  A junior administrator updated the PostgreSQL service unit file per the database administrator's recommendation. The service has been restarted, but changes have not been applied. Which of the following should the administrator run for the changes to take effect?

  A. systemctl get-default

  B. systemctl daemon-reload

  C. systemctl enable postgresql

  D. systemctl mask postgresql

  Correct Answer: B

• Question 3:

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

  A. fetch

  B. checkout

  C. clone

  D. branch

  Correct Answer: C

  Reference: https://stackoverflow.com/questions/18525152/git-clone-and-checkout-in-a-single-command

• Question 4:

  Users are reporting that writes on a system configured with SSD drives have been taking longer than expected, but reads do not seem to be affected. A Linux systems administrator is investigating this issue and working on a solution. Which of the following should the administrator do to help solve the issue?

  A. Run the corresponding command to trim the SSD drives.

  B. Use fsck on the filesystem hosted on the SSD drives.

  C. Migrate to high-density SSD drives for increased performance.

  D. Reduce the amount of files on the SSD drives.

  Correct Answer: A

  Reference: https://www.crucial.com/support/articles-faq-ssd/trim-and-ssd-performance-importance

• Question 5:

  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

  Correct Answer: A

  A. source ~/.bashrc

  The source command is used to re-read a shell configuration file and make its changes effective immediately in the current shell session. In this case, the administrator made changes to the ~/.bashrc file and added an alias command, but the alias is not working. To make the changes in the ~/.bashrc file effective, the administrator should run the following command: source ~/.bashrc

  his will cause the shell to re-read the ~/.bashrc file and apply the changes, including the new alias. After running this command, the administrator should be able to use the alias as expected.

  Option B is incorrect because the read command is used to read input from the user, not to re-read a configuration file. Option C is incorrect because the touch command is used to update the modification time of a file, not to re-read a configuration file. Option D is incorrect because the echo command is used to display text on the screen, not to re-read a configuration file.

• Question 6:

  An administrator installed an application from source into /opt/operations1/ and has received numerous reports that users are not able to access the application without having to use the full path /opt/operations1/bin/*. Which of the following commands should be used to resolve this issue?

  A. echo 'export PATH=$PATH:/opt/operations1/bin' >> /etc/profile

  B. echo 'export PATH=/opt/operations1/bin' >> /etc/profile

  C. echo 'export PATH=$PATH/opt/operations1/bin' >> /etc/profile

  D. echo 'export $PATH:/opt/operations1/bin' >> /etc/profile

  Correct Answer: A

  This command adds the path /opt/operations1/bin to the $PATH environment variable in the /etc/profile file. This will allow users to access the application without having to use the full path /opt/operations1/bin/*.

• Question 7:

  Users report that connections to a MariaDB service are being closed unexpectedly. A systems administrator troubleshoots the issue and finds the following message in /var/log/messages:

  

  Which of the following is causing the connection issue?

  A. The process mysqld is using too many semaphores.

  B. The server is running out of file descriptors.

  C. Something is starving the server resources.

  D. The amount of RAM allocated to the server is too high.

  Correct Answer: C

  C. Something is starving the server resources.

  The message "out of Memory: Killed process 1234 (mysqld)" indicates that the process mysqld was terminated by the Linux kernel due to a lack of available memory. This suggests that something is consuming all of the available memory on

  the server and preventing mysqld from functioning properly. This is an indication of resource starvation, which can cause various issues, including unexpected connection closures.

  Option A "The process mysqld is using too many semaphores" is not relevant to the issue described in the log message. Semaphores are used to synchronize processes, but they do not have an impact on memory usage.

• Question 8:

  A Linux administrator needs to create a new cloud.cpio archive containing all the files from the current directory. Which of the following commands can help to accomplish this task?

  A. ls | cpio -iv > cloud.epio

  B. ls | cpio -iv < cloud.epio

  C. ls | cpio -ov > cloud.cpio

  D. ls cpio -ov < cloud.cpio

  Correct Answer: C

  C. ls | cpio -ov > cloud.cpio

  The cpio command is used to create and extract archive files in the cpio format. The -o option is used to create an archive file, and the -v option provides verbose output during the creation process. This will pipe the output of the ls command (which lists the files in the current directory) into the cpio command, which will create a new archive file cloud.cpio containing all the listed files. The > symbol is used to redirect the output of the cpio command to the cloud.cpio file, overwriting any existing file with the same name.

• Question 9:

  A Linux administrator needs to ensure that Java 7 and Java 8 are both locally available for developers to use when deploying containers. Currently only Java 8 is available. Which of the following commands should the administrator run to ensure both versions are available?

  A. docker image load java:7

  B. docker image pull java:7

  C. docker image import java:7

  D. docker image build java:7

  Correct Answer: B

  The correct command to ensure that both Java 7 and Java 8 are locally available for developers to use when deploying containers is:

  B. docker image pull java:7

  The "docker image pull" command is used to pull images from a Docker registry, such as Docker Hub, to the local system. The "java:7" option specifies the image to be pulled, in this case the Java 7 image.

  So, in this example, the command "docker image pull java:7" pulls the Java 7 image to the local system, making it available for use when deploying containers.

• Question 10:

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

  A. /etc/systemd/journald.conf

  B. /etc/systemd/systemd-journalctl.conf

  C. /usr/lib/systemd/journalctl.conf

  D. /etc/systemd/systemd-journald.conf

  Correct Answer: A