There are three classes of Routing Protocol
* Distance vector protocol
* Link state protocol
* Hybrid protocol
Distance vector protocol.
The Distance-vector protocols find the best path to remote network by judging distance. Each time a packet goes through a router, that’s called a hop. The route with the least number of hops to the network is determined to be the best route. The vector indicates the direction to the remote network. They send the entire routing table to directly connected neighbors.
Ex: RIP, IGRP.
Link state protocol.
Also called shortest-path-first protocols, the routers each create three separate tables. One keeps track of directly attached neighbors, one determines the topology of the entire internet work, and one is used as the routing tables. Link state routers know more about the internet work than any distance-vector routing protocol. Link state protocols send updates containing the state of their own links to all other routers on the network
Ex: OSPF
Hybrid protocol
Hybrid protocol use aspects of both distance-vector and link state protocol.
Ex: EIGRP
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