Cisco is very good ,
But I prefer Microsoft, and I recommend to start with MCDST, then MCSA 2003 & then upgrade to 2008
Also you may continue from MCSA 2003 to MCSE 2003 & then upgrade to 2008
Check Microsoft’s website.
Depending on where you want to focus, The CCENT/CCNA is a great place to start to break into networking. From there, you can go into the CCNP and the other specialized fields. Get the R/S basis completed, then branch out as desired…