SemSim – Free Trial Version of their Cisco router simulator with free CCNA router simulation lab & 20 flash cards. At 2.3Mb this is an easy demo to download with good training and functionality features.
Boson NetSim – Good demo versions of their Cisco router simulators. The demo download files can be pretty big if you’re on a dial-up connection (nearly 40Mb) but the demo’s offer good functionality to get you started.
CertExams – The demo version of their Cisco router simulation is limited to a few labs, and only up to global configuration mode is supported. The download is about 13Mb.
RouterSim’s Network Visualizer. A good functional demo, with more eye candy at the interface level. It’s a 37Mb download but there are video captures of the program on the download page that you can look at before you decide to download this free router demo.
MIMIC CCNA VIrtual Lab Good functional Cisco router simulator that has a number of good, practical features with an intuitive interface. The free trial version can be a little off-putting to download though with all the questions you need to fill out.
TechExams A free Java-based Cisco router simulation that you can use but you need to register first with the site. The simulator has training prompts to help you if you need it along the way. Was still in beta as of the time of writing.
CCNP Practice Tests:
mcmcse.com – Free CCNAPtests – enter site, click the overhead menu
