CompTIA XK0-005 Based on Real Exam Environment

The correct answer is A. chmod g+s /home/test

This command will set the setgid bit on the /home/test directory, which means that any file or subdirectory created in the directory will inherit the group ownership of the directory. This way, the group permissions on files created in the directory will be preserved. The chmod command is used to change the permissions of files and directories. The g+s option is used to set the setgid bit for the group.

The other options are incorrect because:

B. chgrp test /home/test

This command will change the group ownership of the /home/test directory to test, but it will not affect the group ownership of files created in the directory. The chgrp command is used to change the group of files and directories. The test /home/test arguments are used to specify the new group and the target directory.

C. chmod 777 /home/test

This command will give read, write, and execute permissions to everyone (owner, group, and others) on the /home/test directory, but it will not affect the group ownership or permissions of files created in the directory. The chmod command is used to change the permissions of files and directories. The 777 argument is an octal number that represents the permissions in binary form.

D. chown -hR test /home/test

This command will change the owner and group of the /home/test directory and all its contents recursively to test, but it will not preserve the original group permissions on files created in the directory. The chown command is used to change the owner and group of files and directories. The -hR option is used to affect symbolic links and operate on all files and directories recursively. The test /home/test arguments are used to specify the new owner and group and the target directory.

References:

How to Set File Permissions Using chmod

How to Use Chmod Command in Linux with Examples

How to Use Chown Command in Linux with Examples

[How to Use Chgrp Command in Linux with Examples]

As the sudo tool is not installed on the system, administrative tasks must be performed either via direct physical console access or by switching to the root user using the su command. Both methods require knowledge of the root password. Installing Telnet is not a good option due to its lack of security, and installing sudo using an unprivileged user is not possible without root privileges.

When a user is added to a group using usermod -aG, the changes do not take effect until the user logs out and logs back in.

Option A (Correct): Logging out and logging back in updates the user's active group membership.

Option B: Incorrect, as the file is writable by the editors group, not just root.

Option C: Running source /etc/group does not apply group changes to an active session.

Option D: Incorrect, since the user already belongs to the correct group, but the session needs updating.

The ~/.ssh/authorized_keys file contains SSH public keys that grant access to the user account. Removing this file ensures that no external entities can log in using previously authorized keys. The ~/.ssh/known_hosts file stores fingerprints of previously connected hosts. Removing this file ensures that SSH doesn't trust any previously connected hosts.