networking

Question

How many collision domains and broadcast are created when you segment a network with a 12-port switch?

A. 1

B. 2

C. 5

D. 12

Answer 1

First of all we should know that 

Switch is a collision domain separator but not broadcast domain separator..

It is a collision domain separator because it has lookup table associated with it..So each lookup table entry contains a port associated with the switch and the MAC address of the concerned device(computer) associated with this port..

Hence collisions domain is separate for each switch ..A switch is nothing but an active hub..

Switch is not a broadcast domain separator ..But it can be made so using the concept of virtual switching..So in that case it will be a broadcast domain separator..

Hence no of collision domains = No of ports  = 12 

Comments

I agree with your answer. However I have one question in mind.

The question asks for "broadcast domains and collision domain", doesn't it?
No doubt collision Domain is 12, but all ports of Switch falls in the same Broadcast domain, that is totally 1 broadcast domain.

So shouldn't the answer be 13?