CertExams.com router simulator has the following features:
-Several lab exercises: The labs are particularly useful for candidates preparing for Cisco CCNA Intro, ICND, and CCNA certifications. 40+ labs are available for thorough hands-on preparation.
-Cisco router console simulation: Cisco router console (running Cisco router IOS).
-Comprehensive help file
-Simulate up to 3 routers.