Hi, I'm wondering the difference between collision domain and broadcast domain??? I was told a hub can be considered as collision domain (where it broadcast packets to all host, which cause collisions at times) and switch can be considered as broadcast domain. Please verify and explain. Thanks in advance!

A collision domain is only considered in an Ethernet network architecture. In a collision domain there is a chance that two messages can collide. As long as you're using an Ethernet architecture a collision domain will always exist. A braodcast domain is the boundary of a subnet where a network broadcast can exist. So in other words a hub or switch has one broadcast domain since it forwards network broadcasts to all nodes. A router stops network broadcast from leaving the subnet therefore it has as many broadcast domains as ports.

I just have one comment on aznluvsmc reply, collision domains can be broken up by using a switch, router, or bridge, no matter how the Ethernat architecture is set up, collision domains are extended by hubs and repeaters, any CSMA/CD network can be broken into separate collision domains

As you mentioned, all collision domains can be broken up into separate collision domains by subnetting or setting up VLANs correct??

Yeah all collision domains can be broken up with subnets VLANS and such. Its just the fact of knowing how to do these things, as I know, these things aren't easy it is involved in CCNA certification and (un)fortunately I'm taking it, they require some knowledge of binary and all that fun and interesting stuff.

Hey Lee Yea i understand, i'm also studying for CCNA currently. thats why im double checking the difference b/t collision & broadcast domain.. i appreciate your input and good luck on the exam!