Routing Information Protocol
It's port number - 520
One of the oldest distance vector routing protocol, routing metric as hop count.
Currently, IGRP, OSPF, IS-IS are in use.
When data packets travels in a network from source to destination, it must pass through some bridges, routers and gateways. Each time the packet passed to the next network device, a hop occurs . A hop count refers to the number of intermediate devices the packet crosses between the source and destination.
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