Which of the following ports is used to securely transfer files between remote UNIX systems?

A.
21

B.
22

C.
69

D.
445

Explanation:
SCP copies files securely between hosts on a network. It uses SSH for data transfer, and uses the same
authentication and provides the same security as SSH. Unlike RCP, SCP will ask for passwords or
passphrases if they are needed for authentication.
SSH uses TCP port 22. All protocols encrypted by SSH, including SFTP, SHTTP, SCP, SExec, and slogin, also
use TCP port 22.