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WAN technologies connect many devices that are relatively close to each other.  

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Historically, the medium has been a twisted

pair or fiber optic cable, but today it is more commonly a coaxial copper cabling

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In 1973 at IBM Corporation, researcher Bob

Metcalfe designed and tested the first Ethernet network.

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One

goal of the bridge is to reduce any

traffic on both segments.

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The Internet is the most conspicuous

example of computer networking. 

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A frame with a destination address equal to

the broadcast address is not intended for every node, but for specific station on the network. 

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If a station hears its own transmission returning in a garbled form, then it knows

that everything was OK. 

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Frames are analogous to sentences in human

language 

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 The CSMA/CD describes how the Ethernet protocol regulates communication among nodes.