8.2 | Collision Domains and Broadcast Domains | |||
8.2.1 | Shared media environments |
Understanding collision domains requires
understanding what collisions are and how they are caused. To help
explain collisions, Layer 1 media and topologies are reviewed here.
Some networks are directly connected and all hosts share Layer 1. Examples are listed in the following:
It is important to be able to identify a shared media environment, because collisions only occur in a shared environment. A highway system is an example of a shared environment in which collisions can occur because multiple vehicles are using the same roads. As more vehicles enter the system, collisions become more likely. A shared data network is much like a highway. Rules exist to determine who has access to the network medium, but sometimes the rules simply cannot handle the traffic load and collisions occur.
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