Headers or trailers?

What does a router use to make a forwarding decision?

A) UDP port number

B) IP address

C) Application name

D) MAC address

E) TCP port number

F) Flips a coin

The answer: B) IP address

A router is an OSI layer 3 device, and it makes all of its forwarding decisions by evaluating the destination IP address.

Want to know more? Watch “Network Devices.”

We use many different network devices to connect our devices together. In this video, you’ll learn about hubs, switches, routers, firewalls, and much more.