Abstract
This technical paper introduces the topic of network routing.A router is a networking device which forwards network packets from one network to another network. Routing is based on the principle that a destination which is n hops away from a router is one hop closer to the router’s immediate neighbour; i.e. it is just (n-1) hops away from the immediate neighbour. From another perspective, the destination is the immediate neighbour of some router or routers. They in turn have some other routers also as their immediate neighbours and the network or the network of networks continues in this fashion.The reachability that is possible in this manner becomes the basis for exchange of topology and other routing information.
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