tizigman,
I agree the Cisco Press/Boson sim is one of the best out there but ....... do you just want a CCNA or do you plan to work with it?
With the sim - you really should go out to Ebay and pick up a few Cisco 2501 or 2503 routers and a 1900 switch and work on "real" routers. So many of my students work with sims all week and come into the lab on Saturday and just can not get over how "real" network hardware acts different then a software sim.
You just can not do some things on a sim. Have not seen it in a sim but I do not think that you can fake a corrupted flash or erased IOS and go to ROMON to reload the IOS from a TFTP server on a sim. Or break a password and I am sure a bunch of other things.
Don't get me wrong - sims are GREAT but they are not the end all beat all and I not saying you could not pass a CCNA or CCNP exam without a real router but .......
This is very important if you plan to work with the cert. or move onto CCNP or CCIE.
I am working on CCNP now (have passed the Advanced Routing exam) I have 15 Cisco routers and 6 switches so I can practice some very complicated concepts, but I also want to get my CCIE in the next 2-3 years.
I work on both sims and real routers as often as I can.
I hope this helps.
E.A. Broda
CCNA, CCDA, CCAI, Network +