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Which statement is true regarding classless routing protocols?

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Which statement is true regarding classless routing protocols?

(a) The use of discontinuous networks is not allowed

(b) The use of variable length subnet masks is permitted

(c) RIPv1 is a classless routing protocol

(d) RIPv2 supports classless routing

The question was posed to me during an internship interview.

Question is taken from RIP v2 in division Networking of Computer Network

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Correct choice is (b) The use of variable length subnet masks is permitted

Easy explanation: Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontinuous networking.

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