What port number is this?

What TCP port number does Post Office Protocol version 3 use?

A) tcp/80

B) tcp/21

C) tcp/25

D) tcp/110

E) If you use it on a wireless network, you can’t see any ports

The answer: D) tcp/110

The POP3 protocol is used to transfer mail from a mail server to your computer, and it commonly uses TCP port 110 to provide the POP3 service.

Want to know more? Watch “Common Ports.”

The fundamental languages used over our computer networks are a standard set of protocols that are used around the world. In this video, you’ll learn about protocols and the set of standards associated with TCP/IP. You’ll also learn the essentials of TCP/IP and how subnetting can be used to build today’s modern networks.