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 prep. -Cisco router console simulation: Cisco router console (running Cisco router IOS) is available in a simulated environment. Currently 60+ Cisco IOS router commands are supported. It is expected to commit good hands-on undergo to those who do not have access to Cisco routers for learning determination. -Comprehensive assist file: The complete simulator is explained in an gentle to consumption assist file. The areas covered in the assist file include 1. Supported commands, 2. How to navigate through the lab exercises and router console simulator, 3. Disclaimer -Flash cards: Flash cards are available while taking several lab exercises. These provide topic assist, and useful in properly answering the labs. -Simulate up to 3 routers: Up to 3 routers can be simulated. After configuration, you can level ping the other routers for proper configuration verification. Limitations of Demo Simulator: The download contains a demo simulator, and a good version that requires purchasing a cay for unlocking the software. The demo has limitations such as limited labs, and limited subscribe for router commands.