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

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Chapter 1

A1: The primary purpose of a local-area network is to allow resource sharing. The resources may be devices, applications, or information. Examples of shared resources are files, databases, e-mail, modems, and printers.
A2: A protocol is an agreed-upon set of rules. In data communications, the rules usually govern a procedure or a format.
A3: A Media Access Control protocol defines how a given LAN medium is shared, how LAN devices connected to the medium are identified, and how frames transmitted onto the medium are formatted.
A4: A frame is a digital “envelope” that provides the information necessary for the delivery of data across a data link. Typical components of a frame are identifiers (addresses) of the source and destination devices ...

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