DHCP Question

win2k8 · July 2009

Hello All,

I started studying for my 291 exam again. And i was watching the cbt nuggets section on DHCP. And I had a question, when your running out of IP addresses, he talks about a "super-scope" and all he did was create another scope and then right click on the server and added the original scope to the second scope. But, my question is a super-scope really necessarily? Can you not just have two separate scopes on different network segments and still increase the number of IP addresses?

Thanks,

win2k8

siniabhilash · July 2009

Hello Mate,

I understand you are just beginning your 291, once you finish your DHCP chapters you will actually understand the difference.

If you understand the purpose of a superscope explicitly
it will make it clear when to use Superscopes.

First, a mental trick: Every time you hear the word superscope,
mentally (out loud at first) add the word "GROUP" so it becomes
"superscopeGROUP" - scopeGroup would have been a much
better name for this but that's not what the RFCs chose.

A superscope(group) is used when you have a MULTINET--
more than one 'logical subnet' on the same 'physical subnet or
segment of wire'.

You want the DHCP server to service both subnets -- a scope
is related to ONE Subnet.

So create each scope (per logical subnet) and create a superscopeGROUP
because you have a multinet -- add the scopes to the superscope...to
group them.

It's just a scopegroup.

dynamik · July 2009

win2k8 wrote: »

Can you not just have two separate scopes on different network segments and still increase the number of IP addresses?

Of course you can, but you might need additional networking equipment and that's a more complex configuration. Siniabhilash gave a good explanation

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