Although the switching and routing functions within the router are set, there are many differences to be seen among the different routing protocols.
The routing protocols are essentially applications on the router. Their purpose is to ensure the correct and timely exchange of information about the network between the routers so that the routers can successfully perform the routing and switching functions described previously.
IP routing protocols can be divided into several distinct groups. The first is the difference between protocols that send the mask in the updates and the older protocols that do not. These are labeled classless and classful protocols, respectively.
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