Ann, a technician, is attempting to establish a remote terminal session to an end user’s computer using
Kerberos authentication, but she cannot connect to the destination machine. Which of the following
default ports should Ann ensure is open?

A.
22

B.
139

C.
443

D.
3389

Explanation:
Remote Desktop Protocol (RDP) uses TCP port 3389.
Incorrect Answers:A: SSH uses TCP port 22. All protocols encrypted by SSH also use TCP port 22, such as SFTP, SHTTP, SCP,
SExec, and slogin.
B: NetBIOS Session service uses TCP port 139.
C: HTTPS uses TCP port 443

Stewart, James Michael, CompTIA Security+ Review Guide, Sybex, Indianapolis, 2014, pp. 51, 52