Collision Domains and Broadcast domains??

Rehnbo82

I needed a little more help finding out the number of how many Collision and Broadcast domains are there. I have a question sheet and they show a hub with 4 computers pluged into it, how would you decide the number? Also theres a picture of a hub and router with three computer pluged into each of them, how would you determin the number? Thanks

cacharo

Rehnbo82 wrote:

I needed a little more help finding out the number of how many Collision and Broadcast domains are there. I have a question sheet and they show a hub with 4 computers pluged into it, how would you decide the number? Also theres a picture of a hub and router with three computer pluged into each of them, how would you determin the number? Thanks

Know that:

A hub redistributes all traffic received to all connected hosts. (Collisions will occur)

A switch will break up collision domain, but will redistribute all broadcast traffic to all connected hosts. (No collisions, but yes to broadcasts)

A router will not forward broadcasts.

To answer you question everything "beneath" a router is on the same broadcast domain and everything "beneath" 1 port on a switch is on the same collision domain. So if all you have is one hub and 4 computers connected you have one collision domain. But if you have 1 switch connected to 4 hubs with 4 connected computers you have 4 collision domains.

http://en.wikipedia.org/wiki/Collision_domain

http://en.wikipedia.org/wiki/Broadcast_domain