You work as the Network Administrator for XYZ CORP.

The sync command is used to flush filesystem buffers. It ensures that all disk writes have been completed before the processor is halted or rebooted. Generally, it is preferable to use reboot or halt to shut down a system, as they may perform additional actions such as resynchronizing the hardware clock and flushing internal caches before performing a final sync. Answer: B is incorrect. In Unix, the tune2fs command is used to adjust tunable filesystem parameters on the second extended filesystems. Answer: A is incorrect. In Unix, the swapon command is used to activate a swap partition. Answer: C is incorrect. In Unix, the swapoff command is used to de-activate a swap partition.