What do you call it when you have two subnets and find the a common SUPERsubnet that can be used to access both of them?4

I have a Networking test in about 6 hours and I lost my notes on the subject matter and can't recall what the acronym was! Here's the problem case:

Given the address 150.20.0.0/27 find the following subnets and appropriate 'subsubnets' (what's that called as well).

The graphic then goes on to show a diagram of many routers all connected and some routers have a switch connected with a number like 6000h meaning 6000 hosts. My task is to find the SUBsubnet that is needed to accomodate the ammount of hosts without wasting any IP addresses.

The thing I remember is that SUBsubnets have a different subnet mask '/28, /30' than the base father mask.

There is also the matter of connectivity, I have to make sure the entire network can ping whereever. They gave a class on the subject, but again, I can't remember the acronym. I think it was CDLRP or something like that. We're using Cisco's Packet Tracer, so any commands related to this would be great. Basically it's like this:

I hope all of this is making sense to you guys. Any help would be appreciated and some links to tutorials so I can brush up on them before the test.

From serverfault Sergio Tapia

• CIDR ? http://en.wikipedia.org/wiki/CIDR

  Sergio Tapia : Yeah I think that's the answer to the a part of my question. Thanks!
  From Dom

• It's called CIDR and actually it means that you don't have classes in your network. Which can be translated as ... you can use any submask you want.

  From Nikolaidis Fotis