CompTIA Linux+ (XK0-004) — Question 121

A Linux administrator needs to disable the Sendmail service on a Linux server and prevent it from being started manually and during boot.
Which of the following is the BEST command to do this?

Answer options

• A. systemctl reset-failed sendmail
• B. systemctl mask sendmail
• C. systemctl stop sendmail
• D. systemctl disable sendmail

Correct answer: C

Explanation

The correct command is B, which masks the Sendmail service, preventing it from being started manually or during boot. Option A resets the failed state of the service, while option C only stops the service, allowing it to be restarted later. Option D disables the service but does not prevent it from being started manually.