XK0-005 practice questions 211–220

1. Question 211 · 300 in bank

   A newly created container has been unable to start properly, and a Linux administrator is analyzing the cause of the failure. Which of the following will allow the administrator to determine the FIRST command that is executed inside the container right after it starts?

   • Adocker export <container_id>
   • Bdocker info <container_id>
   • Cdocker start <container_id>
   • Ddocker inspect <container_id>

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   Answer: D

   Explanation

   D. docker inspect The docker inspect command provides detailed information about a Docker container, including its configuration and state. Among the information available from this command is the entrypoint, which is the first command that is executed inside the container when it starts. By inspecting the container with docker inspect, the administrator can determine the first command that is executed inside the container and potentially diagnose why it is unable to start properly.

   Source: Adapted from community discussion — linux_admin

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2. Question 212 · 300 in bank

   A Linux administrator is scheduling a system job that runs a script to check available disk space every hour. The Linux administrator does not want users to be able to start the job. Given the following:

   

   The Linux administrator attempts to start the timer service but receives the following error message:

   

   Which of the following is MOST likely the reason the timer will not start?

   • AThe checkdiskspace.timer unit should be enabled via systemctl.
   • BThe timers.target should be reloaded to get the new configuration.
   • CThe checkdiskspace.timer should be configured to allow manual starts.
   • DThe checkdiskspace.timer should be started using the sudo command.

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   Answer: A

   Explanation

   The correct answer is A. The checkdiskspace.timerunit should be enabled via systemctl. Here's why: In order for a systemd timer unit to be active and start the associated service, it needs to be enabled first. Enabling the timer makes sure it will be started at boot or when the systemd daemon reloads its configuration. The other options are less likely to be the issue: B. The timers.targetshould be reloaded to get the new configuration: While reloading might be necessary after making changes, it won’t start a timer that hasn’t been enabled. C. The checkdiskspace.timershould be configured to allow manual starts: This is not necessary for timers; timers run based on their scheduling, not manual starts. D. The checkdiskspace.timershould be started using the sudo command: Starting a timer usually requires administrative privileges, but the primary issue would be that the timer needs to be enabled.

   Source: Adapted from community discussion — RayRay2

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3. Question 213 · 300 in bank

   A Linux administrator wants to find out whether files from the wget package have been altered since they were installed. Which of the following commands will provide the correct information?

   • Arpm -i wget
   • Brpm -qf wget
   • Crpm -F wget
   • Drpm -V wget

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   Answer: D

   Explanation

   D. rpm -V wget The rpm -V (or "verify") command can be used to check the integrity of installed RPM packages. The wget package, as well as all its files, can be verified using this command. If any files have been altered since the package was installed, rpm -V will report the differences. This can help the administrator determine whether any unauthorized changes have been made to the package, or if the files have been damaged in some way.

   Source: Adapted from community discussion — linux_admin

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4. Question 214 · 300 in bank

   A Linux engineer set up two local DNS servers (10.10.10.10 and 10.10.10.20) and was testing email connectivity to the local mail server using the mail command on a local machine when the following error appeared:

   

   The local machine DNS settings are:

   

   Which of the following commands could the engineer use to query the DNS server to get mail server information?

   • Adig @example.com 10.10.10.20 a
   • Bdig @10.10.10.20 example.com mx
   • Cdig @example.com 10.10.10.20 ptr
   • Ddig @10.10.10.20 example.com ns

   Show answer

   Answer: B

   Explanation

   B. dig @10.10.10.20 example.com mx The dig command is a useful tool for querying DNS servers to retrieve information about domain names.

   Source: Adapted from community discussion — linux_admin

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5. Question 215 · 300 in bank

   A Linux engineer has been notified about the possible deletion of logs from the file /opt/app/logs. The engineer needs to ensure the log file can only be written into without removing previous entries.

   

   Which of the following commands would be BEST to use to accomplish this task?

   • Achattr +a /opt/app/logs
   • Bchattr +d /opt/app/logs
   • Cchattr +i /opt/app/logs
   • Dchattr +c /opt/app/logs

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   Answer: A

   Explanation

   The chattr +a command is used to set the "append only" attribute for a file or directory. This attribute ensures that once a file has been created, it cannot be deleted or modified. Any attempts to do so will result in a "permission denied" error. In this case, the command sets the "append only" attribute for the /opt/app/logs directory, which will prevent any changes to existing files or the deletion of files in that directory. New files can still be added to the directory, but their contents cannot be modified. This is useful in cases where the logs stored in the /opt/app/logs directory are critical for debugging or auditing purposes, and need to be kept for an extended period of time. The "append only" attribute helps to ensure the integrity of the logs, by preventing any accidental or malicious changes to the log files.

   Source: Adapted from community discussion — linux_admin

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6. Question 216 · 300 in bank

   A systems administrator needs to check if the service systemd-resolved.service is running without any errors. Which of the following commands will show this information?

   • Asystemctl status systemd-resolved.service
   • Bsystemctl enable systemd-resolved.service
   • Csystemctl mask systemd-resolved.service
   • Dsystemctl show systemd-resolved.service

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   Answer: A

   Explanation

   A. systemctl status systemd-resolved.service The systemctl status command is used to show the current status of a system service in a Linux system that uses systemd. The status information includes the name of the service, its state (e.g. running, stopped), and any related error messages or warnings.

   Source: Adapted from community discussion — linux_admin

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7. Question 217 · 300 in bank

   A Linux administrator needs to remove software from the server. Which of the following RPM options should be used?

   • Arpm -s
   • Brрm -d
   • Crpm -q
   • Drpm -e

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   Answer: D

   Explanation

   D. rpm -e The rpm -e option is used to remove software packages from a Linux system that uses the RPM Package Manager. This option allows the administrator to remove one or more installed packages, along with all their dependencies.

   Source: Adapted from community discussion — linux_admin

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8. Question 218 · 300 in bank

   A Linux system fails to start and delivers the following error message:

   

   Which of the following commands can be used to address this issue?

   • Afsck.ext4 /dev/sda1
   • Bpartprobe /dev/sda1
   • Cfdisk /dev/sda1
   • Dmkfs.ext4 /dev/sda1

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   Answer: A

   Explanation

   The fsck.ext4 command is used to check and repair file system errors on an ext4 file system. In this case, the command is checking the file system located on /dev/sda1. The fsck.ext4 utility is used to detect and correct file system inconsistencies, such as corrupt or lost inodes, missing block groups, and other issues. It's typically run automatically by the operating system during system boot, or manually by the administrator when file system problems are suspected. By running the fsck.ext4 /dev/sda1 command, the administrator is checking the ext4 file system on the first partition of the first SATA disk (/dev/sda1) for any errors. If any problems are found, fsck.ext4 will attempt to repair them. It's important to note that running fsck.ext4 on a mounted file system can cause data loss, so it's recommended to run it on an unmounted file system or in a maintenance mode.

   Source: Adapted from community discussion — linux_admin

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9. Question 219 · 300 in bank

   A user is asking the systems administrator for assistance with writing a script to verify whether a file exists. Given the following:

   

   Which of the following commands should replace the <CONDITIONAL> string?

   • Aif [ -f "$filename" ]; then
   • Bif [ -d "$filename" ]; then
   • Cif [ -f "$filename" ] then
   • Dif [ -f "$filename" ]; while

   Show answer

   Answer: A

   Explanation

   he command "if [ -f "$filename" ]; then" is a shell script that tests for the existence of a file named "$filename". The syntax of this command is as follows: "if" is a shell construct that allows you to execute a command or a series of commands only if a certain condition is met. "[ -f "$filename" ]" is a test command that returns true if "$filename" is a regular file (i.e., not a directory or a symbolic link). The "-f" option is used to test for the existence of a regular file. The "$filename" variable is enclosed in double quotes to allow for the possibility of spaces in the file name. "then" is a keyword that specifies the start of the commands to be executed if the test is true.

   Source: Adapted from community discussion — linux_admin

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10. Question 220 · 300 in bank

    Based on an organization’s new cybersecurity policies, an administrator has been instructed to ensure that, by default, all new users and groups that are created fall within the specified values below.

    

    To which of the following configuration files will the required changes need to be made?

    • A/etc/login.defs
    • B/etc/security/limits.conf
    • C/etc/default/useradd
    • D/etc/profile

    Show answer

    Answer: A

    Explanation

    The /etc/login.defs file is used to set default system-wide settings for new users and groups. This file contains information about user and group creation, such as the default home directory, the default shell, the minimum and maximum UIDs and GIDs, and so on. If the administrator needs to set default values for new users and groups that are created, they would need to make the required changes in the /etc/login.defs file. For example, to set the default home directory for new users to /home/users/, the administrator would add the following line to the file:

    Source: Adapted from community discussion — linux_admin

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XK0-005 practice, question 211. 300 questions available.