Introduction to RIP Operation
RIP version 1 is not operable in today's classless environment. Because of its many limitations, it should be used only in moderately sized, fairly homogenous networks.
With the advent of Classless Interdomain Routing (CIDR), protocols must implement classless behavior. As companies grow, so does the consumption of address space. Two issues have become clear to most organizations: first, that serial point-to-point links do not require eight bits (254 hosts) for the host portion of the IP address; second, that the same subnet can be used by other serial links.
RIP's limitations introduced the need for different subnet masks for LAN and WAN interfaces. It was necessary for RIP to support VLSM, but RIPV1 is incapable ...
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