简单的opnet实例，建立网络拓扑结构，选择仿真的结果，运行仿真，并查看仿真结果。-OPNET simple example, the establishment of network topology, select the simulation results, run simulation, and view the simulation results.

rip仿真，可以自己设计拓扑图，经过若干次运算后输出所有路由器完整的路由表信息。-rip simulation, design topology, to output all routers in the routing table information after several operations.