What would be the best way to connect two switches to a router in order for both switches to have the same bandwidth and speed?

Ok, this is what I have, what is the best way to connect it all of them together?I have one router 7500 and 2 core Cat 6500 switches; I need two networks one .com the other .net. I do not want the traffic from the net side to interface with the com ...

I want to setup a network with two domains, one is a .com the other is a .net I have one router. Would it be better to have the networks divided at the router or use a switch after the router, I do not want traffic from the .net side to enter the .c...