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.