Broadcast = subnet = vlan ??

Node Man

Hi Everyone,
I thought i saw a thread on this but i cant find it. So ill ask again: is a broadcast domain = a subnet = a vlan? Do all have to be in the same subnet range? Is there a piece of the puzzle missing? I am a sucker for those questions "do all of these IP's work if all are /25"?

Please help.

Thanks

Roguetadhg

Do you need to have a different IP subnet for each VLAN.
For example VLAN 2 needs to be on a different subnet than VLAN 3?
Do Routers separate broadcast domains?
Do Router interfaces need different subnet to work?

iamme4eva

http://www.techexams.net/forums/ccna-ccent/85554-new-ccna.html

Was this the link you saw?

broadcast domain = a subnet = a vlan

That is right. A broadcast domain is every host that you will reach if you send a broadcast. They are seperated by either routers or VLANs.You would use a different subnet for every VLAN, the same as you would use a different subnet off every port of a router. Just think of it as another portion of your network.

palit

Answer to all the questions is yes..and that clears a lot of doubt..thanks

Roguetadhg wrote: »

Do you need to have a different IP subnet for each VLAN.
For example VLAN 2 needs to be on a different subnet than VLAN 3?
Do Routers separate broadcast domains?
Do Router interfaces need different subnet to work?

Roguetadhg

I felt that if it was explained "Why" rather than a simple "Yes" the reason would be more clear

BobMead

Yes this is the general rule, Things only change a little when you dig into private vlans. For CCNA just remember that and you are good to go.

Private VLANs Revisited