Summary
RIP is designed for small homogeneous networks, and could not be adopted as a core routing protocol in today's complex classless networks. Considering the rapid growth of the Internet, many destinations would not be routable for RIP.
RIP's inability to support VLSM causes significant address waste, merely to accommodate the protocol limitations. Point-to-point networks that need only two host IDs must have the same mask as the other multipoint interfaces in a network, which results in an enormous waste of valuable address space.
RIP is also less viable as a core routing protocol because it offers no support for discontiguous networks. With part of a class A network distributed between different organizations, that part becomes unroutable ...
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