The router labs made available in the Router Simulator are intended to provide some hands-on practice to beginners. It is encouraged that you write your own labs and practice after going through the labs provided here. Please note that we add and/modify the labs from time to time.
NetSim for CCNA consists of several labs with simulator for routing, spanning tree protocol, and IP subnets. Free demo software is available for download. Network designer for virtual networking simulation for CCNA/CCNP preparation.