Crucial Exams

CompTIA Linux+ XK0-006 (V8) Practice Question

On a freshly installed Ubuntu 22.04 server you create a user called alex and add the account to the sudo group with:

sudo usermod -aG sudo alex

After logging out and back in, alex can run sudo apt update even though neither /etc/sudoers nor any file in /etc/sudoers.d has been edited.
Which explanation correctly describes why this procedure works?

  • Members of the sudo group are automatically assigned UID 0 in /etc/passwd, giving them root privileges without needing sudo or a password.

  • A built-in polkit rule maps the sudo group to the wheel role, providing password-less root access only from the system console.

  • The default /etc/sudoers file contains the entry %sudo ALL=(ALL:ALL) ALL, so any user added to the sudo group may execute any command with sudo after entering their own password.

  • When a session is started by a sudo group member, PAM grants the CAP_SYS_ADMIN capability to all of the user's processes, eliminating the need for sudo.

CompTIA Linux+ XK0-006 (V8)
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