Protocol IDs and Ports

Are you planning to take the Security+ exam? If so, make sure you know the relevant ports and protocol IDs.

See if you can answer this practice test question.

Q. You need to enable the use of NetBIOS through a firewall. Which ports should you open?

A. 137 through 139

B. 20 and 21

C. 80 and 443

D. 22 and 3389

Check out the answer (and full explanation) here.