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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Repeaters and Bridges

The information presented so far may be distilled into a few brief statements:

  • A data communication network is a group of two or more devices connected by a common, shared medium.

  • These devices have an agreed-upon set of rules, usually called the Media Access Control, or MAC, that govern how the media is shared.

  • Each and every device has an identifier, and each identifier is unique to only one device.

  • Using these identifiers, the devices communicate by encapsulating the data they need to send within a virtual envelope called a frame.

So here's this wonderful resource-sharing tool called a LAN. It's so wonderful, in fact, that everyone wants to be connected to it. And herein is the rub. As a LAN grows, new problems present ...

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