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Which statement is true regarding classless routing protocol?

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Which statement is true regarding classless routing protocol?

(a) The use of discontinuous networks is not allowed

(b) Use of variable length subnet masks is permitted

(c) RIPv1 is a classless routing protocol

(d) IGRP supports classes routing within the same autonomous system

This question was addressed to me in unit test.

This interesting question is from RIP v1 topic in chapter Networking of Computer Network

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Correct answer is (b) Use of variable length subnet masks is permitted

The best explanation: Use of variable length subnet masks is permitted in classless routing protocols. Also use of discontinuous networks is allowed in such routing protocols. RIPv1 is a classful routing protocol but RIPv2 is classless routing protocol.

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