1-3Figure 1-1 A sample routing tableRouter ARouter BRouter HRouter E16.0.0.217.0.0.315.0.0.0 12.0.0.017.0.0.011.0.0.016.0.0.013.0.0.014.0.0.0Router CRouter DRouter FRouter G11.0.0.112.0.0.112.0.0.215.0.0.115.0.0.217.0.0.116.0.0.113.0.0.113.0.0.214.0.0.114.0.0.214.0.0.314.0.0.417.0.0.211.0.0.213.0.0.3Destination Network Nexthop Interface11.0.0.0 11.0.0.1 212.0.0.0 12.0.0.1 113.0.0.0 12.0.0.2 114.0.0.0 14.0.0.4 315.0.0.0 14.0.0.2 316.0.0.0 14.0.0.2 317.0.0.0 11.0.0.2 2Routing Protocol OverviewStatic Routing and Dynamic RoutingStatic routing is easy to configure and requires less system resources. It works well in small, stablenetworks with simple topologies. Its major drawback is that you must perform routing configurationagain whenever the network topology changes; it cannot adjust to network changes by itself.Dynamic routing is based on dynamic routing protocols, which can detect network topology changesand recalculate the routes accordingly. Therefore, dynamic routing is suitable for large networks. Itsdisadvantages are that it is difficult to configure, and that it not only imposes higher requirements onthe system, but also consumes a certain amount of network resources.Classification of Dynamic Routing ProtocolsDynamic routing protocols can be classified based on the following standards:Operational scopez Interior gateway protocols (IGPs): Work within an autonomous system, including RIP, OSPF, andIS-IS.
