There are two primary reasons for segmenting a LAN. The first is to isolate traffic between segments, and secondly, to achieve more bandwidth per user by creating smaller collision domains. The area within the network where the data packets originate and collide is called a collision domain; this includes all shared media. Without the use of LAN segmentation, LANs of larger workgroup would quickly become clogged with traffic and collisions, this would result in virtually no bandwidth.
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