Which of the following ports should be used by a system administrator to securely manage a remote
server?

A.
22

B.
69

C.
137

D.
445

Explanation:
Secure Shell (SSH) is a more secure replacement for Telnet, rlogon, rsh, and rcp. SSH can be called a
remote access or remote terminal solution. SSH offers a means by which a command-line, text-only
interface connection with a server, router, switch, or similar device can be established over any distance.
SSH makes use of TCP port 22.
Incorrect Answers:
B: Port 69 is used by TFTP.
C: NetBIOS uses port 137.
D: Port 445 is used by Microsoft-DS.

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 42, 51
http://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers