If you're interested in going into networking the CCNET is the obvious place to start. If you have experience, you can probably skip right to the CCNA. I picked up my CCNA a few years ago, and while it was a really intense course, it wasn't hard stuff. We have one of the top Cisco Academies here where I go to school (it was the very first one in fact) so it seemed like something worth having. If you can't get access to a router lab, Cisco makes some really good simulator programs. That said, nothing beats working with the actual gear.