Why Routing Protocol!!!
As you all may be well aware by now, in static routing the reachable (routing) information to any network is put into the route table manually. This practice is well suited for small sized networks, where the single Network Administrator remembers the entire network topology, is able to track the any changes in the network and hence manually update the reachable information. When the network size grows to medium and to large networks, the effort a Network Administrator need to put, grows to cumbersome or to almost impossible. In a large sized network there would more than just one Network Admin and each would be enjoying information about only a portion of the network. More over a company cannot expect the Network Admin to be their employee always. Thus understanding the network topology and the routing information for a medium and large sized network is not an easy task for Network Administrators. Hence there was a demand for routing protocols which are nothing but a set of rules or a language the router follow to automatically discover the reachable information (routing information) and the state of the networks.
Dynamic Routing Protocol.
Now we understood routing protocol automatically discover and create the routing table, but ever wondered why is called Dynamic Routing Protocol not Automatic Routing Protocol or just Routing Protocol. Its because Dynamic Routing Protocol provides more functions like, determining the next best path in case the best path to destination becomes unusable or unavailable, capability to adapt to changes in network topology automatically.
As you all may be well aware by now, in static routing the reachable (routing) information to any network is put into the route table manually. This practice is well suited for small sized networks, where the single Network Administrator remembers the entire network topology, is able to track the any changes in the network and hence manually update the reachable information. When the network size grows to medium and to large networks, the effort a Network Administrator need to put, grows to cumbersome or to almost impossible. In a large sized network there would more than just one Network Admin and each would be enjoying information about only a portion of the network. More over a company cannot expect the Network Admin to be their employee always. Thus understanding the network topology and the routing information for a medium and large sized network is not an easy task for Network Administrators. Hence there was a demand for routing protocols which are nothing but a set of rules or a language the router follow to automatically discover the reachable information (routing information) and the state of the networks.
Dynamic Routing Protocol.
Now we understood routing protocol automatically discover and create the routing table, but ever wondered why is called Dynamic Routing Protocol not Automatic Routing Protocol or just Routing Protocol. Its because Dynamic Routing Protocol provides more functions like, determining the next best path in case the best path to destination becomes unusable or unavailable, capability to adapt to changes in network topology automatically.
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