CompTIA XK0-006 Online Practice Questions and Exam Preparation

CompTIA XK0-006 Online Questions & Answers

• Question 161:

  Users connecting to a MySQL database on a Linux system report frequent errors. An administrator reviews the following partial output of the /proc/meminfo and free commands:

  

  Which of the following should the administrator do to ensure that the MySQL service will continue to run even if the system runs out of swap space? (Select two.)

  A. Issue the sysctl -w vm.overcommit_ratio=100 command.
  B. Issue the sysctl -w vm.overcommit_memory=2 command.
  C. Issue the dd if=/dev/zero of=/swapfile bs=1024 count=65536 command.
  D. Issue the mkswap /dev/sda2; swapon -v /dev/sda2 command.
  E. Reload the /etc/fstab file by issuing the mount -a command.
  F. Use disk quotas on the swap space to prevent MySQL from overutilizing the swap partition.
  C. Issue the dd if=/dev/zero of=/swapfile bs=1024 count=65536 command.
  D. Issue the mkswap /dev/sda2; swapon -v /dev/sda2 command.

• Question 162:

  Which of the following best describes JSON?

  A. A programming language that developers use to build dynamic websites
  B. An open-source platform that facilitates the creation and administration of isolated environments
  C. A file format for exchanging information or data between systems
  D. A software-based technique that allows a computer to simulate one or more machines so they appear to be real
  C. A file format for exchanging information or data between systems

• Question 163:

  A Linux administrator needs to replace the content of the test1.sh file with the content of the test2.sh file.

  Which of the following commands will help accomplish this task?

  A. cat test2.sh >> test1.sh
  B. cat test2.sh > test1.sh
  C. cat test2.sh < test1.sh
  D. cat test2.sh ?test1.sh
  B. cat test2.sh > test1.sh

• Question 164:

  An administrator set up a new user account called "test". However, the user is unable to change their password. Given the following output:

  

  Which of the following is the most likely cause of this issue?

  A. The SUID bit is missing on the /bin/passwd file.
  B. The password provided by the user "test" does not meet complexity requirements.
  C. The user "test" already changed the password today.
  D. The password has been disabled for user "test".
  A. The SUID bit is missing on the /bin/passwd file.

• Question 165:

  A new user is experiencing issues creating files in the folder /home/testuser/testdir/. The directory needs to be accessible for reading by other users in the system.

  The administrator gathers the following information:

  drwxr-xr-x.

  2 root testuser 6 Oct 19 11:22 testdir Which of the following commands should the administrator use to solve the issue? (Select TWO.)

  A. chmod u+w /home/testuser/testdir/
  B. usermod -G root testuser
  C. chmod g+w /home/testuser/testdir/
  D. usermod -G testuser root
  E. chown newuser /home/testuser
  A. chmod u+w /home/testuser/testdir/
  C. chmod g+w /home/testuser/testdir/

• Question 166:

  A Linux administrator is attempting to capture all network traffic coming to the server from the 10.0.6.5 IP address.

  Which of the following commands should the administrator run on the server to achieve the goal?

  A. tcpdump ip 10.0.6.5
  B. tcpdump net 10.0.6.5
  C. tcpdump host 10.0.6.5
  D. tcpdump addr 10.0.6.5
  C. tcpdump host 10.0.6.5

• Question 167:

  An administrator updates the network configuration on a server but wants to ensure the change will not cause an outage if something goes wrong.

  Which of the following commands allows the administrator to accomplish this goal?

  A. netplan try
  B. netplan rebind
  C. netplan ip
  D. netplan apply
  A. netplan try

  ---

  Explanation

  Network configuration changes can cause immediate loss of connectivity if applied incorrectly. Linux+ V8 emphasizes safe configuration practices, particularly when managing remote systems.

  The netplan try command applies network configuration changes temporarily and prompts the administrator to confirm them within a timeout period. If the administrator does not confirm, Netplan automatically rolls back to the previous working configuration. This prevents accidental outages caused by misconfigured network settings.

  The netplan apply command makes changes permanent immediately and does not provide rollback protection.

  The other options are not valid Netplan commands.

  Linux+ V8 documentation explicitly references netplan try as a safe testing mechanism.

• Question 168:

  A Linux administrator needs to analyze a compromised disk for traces of malware. To complete the analysis, the administrator wants to make an exact, block-level copy of the disk.

  Which of the following commands accomplishes this task?

  A. cp -rp /dev/sdc/* /tmp/image
  B. cpio -i /dev/sdc -ov /tmp/image
  C. tar cvzf /tmp/image /dev/sdc
  D. dd if=/dev/sdc of=/tmp/image bs=8192
  D. dd if=/dev/sdc of=/tmp/image bs=8192

  ---

  Explanation

  Disk forensics and malware analysis fall under the Security domain in the CompTIA Linux+ V8 objectives. When analyzing a compromised disk, it is critical to preserve the data exactly as it exists, including unused space, deleted files, and hidden metadata. This requires a block-level copy , not a file-level copy.

  The dd command is the correct tool for this task. It operates at a low level, copying raw data from an input device (if=/dev/sdc) directly to an output file (of=/tmp/image) without interpreting filesystem structures. This ensures an exact, bit-for-bit replica of the disk, which is essential for forensic integrity and malware analysis. The bs=8192 option improves performance by specifying a larger block size during copying.

  The other options are incorrect. cp -rp copies files and directories but does not capture free space, deleted data, or disk metadata. cpio and tar are archive utilities that operate at the filesystem level and cannot produce a true disk image. These tools also require the filesystem to be mounted and readable, which is not appropriate for forensic preservation.

  Linux+ V8 documentation highlights dd as the preferred utility for disk imaging, backups, and forensic investigations. Administrators are also advised to perform such operations on unmounted disks to avoid altering evidence.

• Question 169:

  When trying to connect from the bastion host to the remote server, a Linux user always forgets to add some required options in the SSH command line.

  Which of the following is the best way to permanently solve the user's issue?

  A. Write a connection script and put it in the user's home directory.
  B. Instruct the user to add the required options to the ~/.ssh/config file
  C. Add the required options to /etc/ssh/sshconfig
  D. Establish an alias for the SSH command with all the required options.
  B. Instruct the user to add the required options to the ~/.ssh/config file

• Question 170:

  The systemd logs are disappearing after a restart, even though the free disk space is adequate.

  Which of the following is the cause of this behavior?

  A. The option Storage=volatile is set in the journald configuration
  B. The journald size limit has been exceeded
  C. The service systemd-journald is disabled and masked
  D. The directory /tmp does not have enough tree space
  A. The option Storage=volatile is set in the journald configuration