XK0-005 practice questions 231–240

1. Question 231 · 300 in bank

   A junior administrator is trying to set up a passwordless SSH connection to one of the servers. The administrator follows the instructions and puts the key in the authorized_key file at the server, but the administrator is still asked to provide a password during the connection. Given the following output:

   

   Which of the following commands would resolve the issue and allow an SSH connection to be established without a password?

   • Arestorecon -rv .ssh/authorized_key
   • Bmv .ssh/authorized_key .ssh/authorized_keys
   • Csystemctl restart sshd.service
   • Dchmod 600 mv .ssh/authorized_key

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   Answer: B

   Explanation

   B. mv .ssh/authorized_key .ssh/authorized_keys This changes the name of the file from authorized_key to authorized_keys, which is the conventional name for the file that contains authorized public keys for passwordless SSH connections. By convention, the ssh-keygen tool generates the authorized_keys file, and some SSH servers expect this exact name. Changing the name of the file to authorized_keys may resolve the issue and allow the passwordless connection to be established.

   Source: Adapted from community discussion — linux_admin

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2. Question 232 · 300 in bank

   A Linux administrator needs to resolve a service that has failed to start. The administrator runs the following command:

   

   The following output is returned

   

   Which of the following is MOST likely the issue?

   • AThe service does not have permissions to read write the startupfile.
   • BThe service startupfile size cannot be 81k.
   • CThe service startupfile cannot be owned by root.
   • DThe service startupfile should not be owned by the root group.

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   Answer: A

   Explanation

   Selecting A - The output from the ls -l command shows the permissions of the startup file as a series of dashes (----------), this means that there are no permissions set for the owner, group, or others. This would prevent any user, including the root user, from reading, writing, or executing the file.

   Source: Adapted from community discussion — RB34561

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3. Question 233 · 300 in bank

   A Linux engineer is setting the sticky bit on a directory called devops with 755 file permission. Which of the following commands will accomplish this task?

   • Achown -s 755 devops
   • Bchown 1755 devops
   • Cchmod -s 755 devops
   • Dchmod 1755 devops

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   Answer: D

   Explanation

   D. chmod 1755 devops The sticky bit is a special permission that can be set on directories, and it is represented by the number "1" in the binary representation of the file permission mode. To set the sticky bit and keep the 755 file permission, you would set the permission mode to 1755. The "chmod 1755 devops" command sets the file permission mode to 1755, which includes the sticky bit and the 755 file permissions.

   Source: Adapted from community discussion — linux_admin

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4. Question 234 · 300 in bank

   A Linux administrator booted up the server and was presented with a non-GUI terminal. The administrator ran the command systemctl isolate graphical.target and rebooted the system by running systemctl reboot, which fixed the issue. However, the next day the administrator was presented again with a non-GUI terminal. Which of the following is the issue?

   • AThe administrator did not reboot the server properly.
   • BThe administrator did not set the default target to basic.target.
   • CThe administrator did not set the default target to graphical.target.
   • DThe administrator did not shut down the server properly.

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   Answer: C

   Explanation

   C. The administrator did not set the default target to graphical.target. When a Linux system is booted, it starts a target, which is a group of units that define the system state. The administrator ran the command "systemctl isolate graphical.target" which switches the system to the graphical target and provides a GUI interface. However, if the default target is not set to graphical.target, the system will revert back to the non-GUI terminal after a reboot.

   Source: Adapted from community discussion — linux_admin

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5. Question 235 · 300 in bank

   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?

   • AThe process mysqld is using too many semaphores.
   • BThe server is running out of file descriptors.
   • CSomething is starving the server resources.
   • DThe amount of RAM allocated to the server is too high.

   Show answer

   Answer: C

   Explanation

   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.

   Source: Adapted from community discussion — linux_admin

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6. Question 236 · 300 in bank

   A developer is trying to install an application remotely that requires a graphical interface for installation. The developer requested assistance to set up the necessary environment variables along with X11 forwarding in SSH. Which of the following environment variables must be set in remote shell in order to launch the graphical interface?

   • A$RHOST
   • BSETENV
   • C$SHELL
   • D$DISPLAY

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   Answer: D

   Explanation

   D. $DISPLAY The DISPLAY environment variable tells the X Window System which display to use for any graphical applications that are launched. When using X11 forwarding over SSH, the DISPLAY variable must be set in the remote shell to the value of the display on the local system. This allows graphical applications running on the remote system to display their windows on the local system.

   Source: Adapted from community discussion — linux_admin

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7. Question 237 · 300 in bank

   Select 2

   A systems administrator is implementing a new service task with systems at startup and needs to execute a script entitled test.sh with the following content:

   

   The administrator tries to run the script after making it executable with chmod +x; however, the script will not run. Which of the following should the administrator do to address this issue? (Choose two.)

   • AAdd #!/bin/bash to the bottom of the script.
   • BCreate a unit file for the new service in /etc/systemd/system/ with the name helpme.service in the location.
   • CAdd #!//bin/bash to the top of the script.
   • DRestart the computer to enable the new service.
   • ECreate a unit file for the new service in /etc/init.d with the name helpme.service in the location.
   • FShut down the computer to enable the new service.

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   Answer: BC

   Explanation

   C. Add #!/bin/bash to the top of the script. B. Create a unit file for the new service in /etc/systemd/system/ with the name helpme.service in the location. Option C is necessary because it specifies the interpreter for the script. The shebang line, "#!/bin/bash", must be added to the top of the script to indicate which interpreter should be used to run the script. Option B is necessary because the script must be registered as a service in the systemd system in order to be executed at startup. The administrator should create a unit file for the new service in /etc/systemd/system/ with the name helpme.service, which will describe how the service should be executed and how it should be managed by the system.

   Source: Adapted from community discussion — linux_admin

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8. Question 238 · 300 in bank

   A Linux administrator needs to correct the permissions of a log file on the server. Which of the following commands should be used to set filename.log permissions to -rwxr—r--. ?

   • Achmod 755 filename.log
   • Bchmod 640 filename.log
   • Cchmod 740 filename.log
   • Dchmod 744 filename.log

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   Answer: D

   Explanation

   D. chmod 744 filename.log The chmod command is used to change the permissions of files in Linux. The number passed to chmod specifies the binary representation of the desired permissions. The binary representation of -rwxr—r-- is 111 100 100, which corresponds to the decimal value 744. So, the command to set the permissions to -rwxr—r-- is "chmod 744 filename.log".

   Source: Adapted from community discussion — linux_admin

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9. Question 239 · 300 in bank

   A systems administrator is deploying three identical, cloud-based servers. The administrator is using the following code to complete the task:

   

   Which of the following technologies is the administrator using?

   • AAnsible
   • BPuppet
   • CChef
   • DTerraform

   Show answer

   Answer: D

   Explanation

   In this example, Terraform is used to deploy an Amazon Web Services (AWS) EC2 instance. The first line of the code defines the AWS provider, and the region attribute is set to "us-west-2". The second section of the code defines the aws_instance resource. The ami attribute specifies the Amazon Machine Image (AMI) ID to use, and the instance_type attribute specifies the type of instance to deploy. The tags attribute is used to add a tag to the instance, with the key "Name" and the value "example-instance". This code is a simple example of how Terraform can be used to deploy a cloud-based server. In a real-world scenario, the code would likely be more complex and include additional resources and configuration options, such as security groups, subnets, and more.

   Source: Adapted from community discussion — linux_admin

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10. Question 240 · 300 in bank

    After listing the properties of a system account, a systems administrator wants to remove the expiration date of a user account. Which of the following commands will accomplish this task?

    • Achgrp system accountname
    • Bpasswd –s accountname
    • Cchmod -G system account name
    • Dchage -E -1 accountname

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    Answer: D

    Explanation

    D. chage -E -1 accountname The chage command is used to modify the aging information of a user account, including the expiration date. The -E option is used to specify the expiration date of an account, and the -1 option sets the expiration date to a value of "never". So, the command "chage -E -1 accountname" will remove the expiration date of the account "accountname".

    Source: Adapted from community discussion — linux_admin

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XK0-005 practice, question 231. 300 questions available.