CompTIA Linux+ (XK0-004) — Question 302

A system shows high utilization of swap space but low utilization of physical memory.
Which of the following commands should an administrator run to free up usable swap space?

Answer options

• A. mkswap ; swapon -a
• B. free && swapon -a
• C. swapoff -a && swapon -a
• D. swapon -a ; swapoff -a

Correct answer: C

Explanation

The correct answer is C because the 'swapoff -a' command disables all swap space, which frees it up, and then 'swapon -a' re-enables it, allowing the system to reclaim usable swap space. The other options either do not effectively free up swap space or are not appropriate commands for this purpose.