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www.geocities.com/SiliconValley/Vista/8672/network/ethernet.html

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Posted by crouse

Collisions are normal in Ethernet networks. In many cases, Collision rates of 50 percent do not cause a large decrease in throughput.

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Posted by sagitraz

The way Ethernet works is closely linked to its original connection type: A coaxial cable was used to join all the hosts together. This formed a segment. On a single segment, only one host could use the cable at a time; because the wire was coaxial, with one positive conductor and one negative conductor, it created a single electrical circuit. This single circuit could be energized by only one host at a time, or a conflict would result as two hosts tried to talk at once and nothing got through. Much the same thing happens when you and a friend try to send at the same time using walkie-talkies; all that is heard is noise. This conflict is called a collision.

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Posted by griffinLincoln