Distance Vector, Link State, and Path Vector
Routing protocols are effectively distributed database systems. They propagate information about the topology of the network among the routers within the network. Each router in the network then uses this distributed database to determine the best loop free path through the network to reach any given destination. There are two fundamental ways to distribute the data through a network:
By distributing vectors, each router in the network advertises the destinations it can reach, along with information that can be used to determine the best path to each reachable destination. A router can determine the best vector (path) by examining the destinations reachable through each adjacent router or neighbor, ...
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