Anand Software blog on update to CCNA Netsim to include several labs on Site to Site VPN and FHRP (First Hop Redundancy Protocol). NetSim, used to represent Network Simulator, is tool to configure and troubleshoot wide area networks, particularly in preparing for CCNA certification.
The page provides help on navigating the CCNA Network simulator through various sections, such as designing your own labs, configuring the lab exercises, exporting the designed labs to the simulator, and troubleshooting the same.