X Physical NIC = X Virtual Switch?

Hi,

I've been Reading many tutorials about the Hyper-V networking and I have some questions about the relation between physical NIC's and Virtual Switch's related with the network performance.

My question is:

I have one server with 4 physical NIC's and I'll deploy 4 VM's (Exchange, DC, WEB & File Server). Wich is the best practise to gain a better performance? Create a Virtual Switch for each VM? And each Virtual Switch to the appropiate physical NIC's?

NIC_1 = Virtual Switch_1 = VM_1

NIC_2 = Virtual Switch_2 = VM_2

NIC_3 = Virtual Switch_3 = VM_3

NIC_4 = Virtual Switch_4 = VM_4

This 4 VM's will be an external type.

Thanks for your help!

Tecnico Superior de Sistemas