CompTIA Security Plus Mock Test Q139

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

A. 21
B. 22
C. 69
D. 445

Correct Answer: B
Section: Network Security

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.

Incorrect Answers:
A: Port 21 is used by FTP.
C: Port 69 is used by TFTP.
D: Port 445 is used by Microsoft-DS.

References:
Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, p. 51
http://www.computerhope.com/unix/scp.htm
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers