Cisco Certified Network Professional (CCNP) Question:
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Explain the difference between a classful and a classless routing protocol.

Answer:

Classless routing protocols advertise subnet mask information along with the network prefixes. Classful routing protocols do not. Therefore, for a classful protocol, all subnets for the major network number being used must be the same length. Also, classful protocol cannot support discontiguous networks prefixes.

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