RouterSim's CCNA Network Visualizer 8.0 is a CCNA router and network simulator that offers more features and flexibility than any product on the market. You can design, build and configure your own network. Our program offers 500 supported commands, 170 hands-on labs, 39 practice scenarios (trouble shooting), and hands-on labs topics that follow Todd Lammle's CCNA Routing and Switching Study Guide.