了解路由及路由器的概念，路由器的功能，工作原理，路由表，路由算法分类等。学习使用距离矢量算法的动态路由。并附上tcl源码-Understand the concept of routing and routers, the router function, working principle, the routing table, routing algorithm classification. Learn to use dynamic routing distance vector algorithm. Tcl source code along with