I am a student and I have just started taking cisco courses. I can hardly wait to go back to school. I have bought from Ebay a 2610 and a 3620 router. The 3620 has a NM-E1 2W card and the other has a WIC 1DSU 56K. Since I bought these to learn from, and use in my home, I would like to connect the routers together. I can see I will need to purchase cards for the two routers to "talk" to each other, but what kinds? Do I need serial cards? What kinds of serial cards would be recommended? I would like something I can learn from, not just something I can plug together, type in a few commands and go.