Network Simulator for CCNA: CCNA Network Simulator provides advanced router/switch network simulator functionalities including VLANs, VTP, interVLAn communications, RIP v2, OSPF, and WAN protocol simulation.Check out here for Demo Version http://routersimulator.certexams.com/ccna-simulator-download/download-router-simulator.html, upto global configuration mode is supported in demo version.