Hey there, umm, buddy

Which of these port numbers should you enable on your firewall to allow name resolutions to work properly?

A) udp/53

B) tcp/80

C) udp/110

D) tcp/3389

E) tcp/25

F) I can’t remember names anyway

The answer: A) udp/53

DNS (Domain Name System) lookups are commonly sent over UDP port 53.

Want to know more? Watch “Common TCP and UDP Ports.”

TCP and UDP are the primary transport protocols used in today’s modern networks. In this videos, you’ll get an operational overview of the TCP and UDP protocols, and you’ll learn the TCP and UDP ports that will be important to know for your CompTIA A+ exam.