Protocols and Ports in Security+

If you're planning to take the Security+ exam, you should have a basic understanding of relevant protocols and ports to implement basic network security.

For example, can you answer this question?

Q. Bart wants to block access to all external web sites. Which port should he block at the firewall?

A. TCP 22

B. TCP 53

C. UDP 69

D. TCP 80

More, do you know why the correct answer is correct and the incorrect answers are incorrect?

See if you're correct here.

Will you see port questions on the Security+ exam? You never know. However, I saw two.