segment and collision domain

Unanswered Question
Feb 29th, 2008

Hi all, can anyone tell me the meaning of collsion domain, is that a hub? or half duplex ? also what do we define as a network segment ?

I have this problem too.
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Brandon Buffin Fri, 02/29/2008 - 08:37

A collision domain is anywhere that packets can collide in the network. This generally occurs in half-duplex hub environments. So, a hub does represent a single collision domain. All packets sent out are competing for the same bandwidth. In a full-duplex switched environment, packets can be sent at the same time by multiple hosts and do not collide. Strictly speaking, in a switched environment, each port represents a segment. So, a segment can be said to be a part of the network where all devices use the same physical connection. If a group of computers were connected to a hub which then connected to a switch port, this would be 1 segment. If, however, you connect another switch, this would create another segment. You will also see the term segment used to indicate a part of the network separated from the rest of the network by a Layer 3 device (router). The following link might help.

Hope this helps. If so, please rate the post.


carl_townshend Fri, 02/29/2008 - 08:45

thanks for that,

so if we had 3 switches plugged into each other, is this 3 segments ?

Brandon Buffin Fri, 02/29/2008 - 08:56

Yes, each switch can be thought of as a segment. But, behind those segments, you will technically have as many segments as you have switch ports.



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