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Hi gurus, i need your help.
I wish to segment my network which uses Class C IP addresses. Currently almost all the ip addresses are used up (254). I wish to create a domain made up of three (3) sites and about 600 pc's. I have the following concerns and i need you guys out there to help me out.
1. Can i have still use my class C addressing to create 3 sites, ie each site having 200 hosts and all in one LAN? What i am thinking of is having something like the following,,

Would this mean i have subnetted my network? Would i be better off using a Class B addressing? I feel there would be a huge waste of Ip addresses. Can someone help me out?

4 Solutions
You can but if you need to add more hosts to those subnets you'll run out of addresses pretty quick. I'd go for the Class B to be sure. Keep in mind that you'll need router(s) to connect the different subnets.
Don't worry about it being a waste, you are using private IP addresses, they are free :)

I would use 3 10.x.x.x subnets:

This will give you 65,534 IP addresses per subnet so you won't ever have to worry about "re-subnetting" again.
You don't need to create 3 sites if all computers are in the same location and connect to the same network. Go to a class B network with local addresses. You can use -, these are local B class addreses assigned as in RFC 1918.
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I forgot to say that if you use 3 different networks you'll need routers between them, so better go to class B.
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