This Virtual Lab includes 20 Virtual Routers which are instances of the Cisco CSR1000v Software. They run Software version XE 3.16.06.S with IOS 15.5(3)S6. This Virtual Lab includes a VIRL VM (Virtual Internet Routing Lab). However, a VIRL License is not included (see details below) It also includes a GNS3 VM (Graphical Network Simulator 3).