I'll hopefully be moving on to my NP studies by the end of the month, and I think I'm going to go the dynamips/dynagen route. I was curious about how many physical NICs I'm going to need in order to connect to my switches and do the relevant labwork. I already have a few, but they're not compatible with Vista/7

Also, I have three 2950s and one 3550. I believe a second 3550 is recommended. Is that correct?