A technician would like to connect to a computer using remote desktop. Which of the following
ports does remote desktop use by default?

A.
22

B.
443

C.
3389

D.
8080

Explanation:

The default port for remote desktop application is 3389.

http://windows.microsoft.com/en-us/windows7/allow-remote-desktop-connections-fromoutside-your-home-network(see forward TCP port 3389)