Quotes from Todd Lammle

It's important for you to understand that routers, which work at the Network layer, don't care about where a particular host is located. They're only concerned about where networks are located and the best way to reach them—including remote ones. Routers are totally obsessive when it comes to networks. And for once, this obsession is a good thing! The Data Link layer is responsible for the unique identification of each device that resides on a local network.

Set the hostname of a router. The command sequence to set the hostname of a router is as follows: enable config t hostname Todd

Carrier Sense Multiple Access with Collision Detection (CSMA/CD)