Question

In an organization there are four Hosts (i.e. Host A, Host B, Host C and Host D) connected to a Router (i.e. Router0). Explain in your own words (a) what happens when each of the four Hosts send a broadcast (b) How many broadcast domains are on the Router0? (c) If the Router (i.e. Router0) is replaced by a hub, how many broadcast domains are on the hub? (d) If the Router (i.e. Router0) is replaced by a switch, how many collision domains are on the switch?

Answer 1

Here I am going to give you the solution(Please lookk into the image solution for better explanation via diagrams):-

(a).Broadcasting is a method of transferring a message to all recipients simultaneously. In the above case routers are configured to support all protocols within its broadcast domain with hosts.

So, we can say that router creates separate broadcast domains(Note that router doesn't broadcast transmission, it only drops and transfer packet of information and data).

(b).From above discussion that router creates separate broadcast domains with each port connected to it.

• Hence number of broadcast domains for router = 4 (single unit for each Hosts).

(c).If router is replaced by a hub then it is known that hubs pass all the traffic and devices connected to hub are in single collision and single broadcast domain.Hence,

• No. of broadcast domain on the hub :-1(single connection to devices connected to it)

(d).Here we can say that switches pass broadcast traffic and create separate collision with each port

• (Please look into the figure in image). Hence, collision domains in switch network = 4.