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The number of layers in ISO OSI reference model is __________

(a) 5

(b) 7

(c) 6

(d) 10

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Correct answer is (b) 7

Explanation: The seven layers in ISO OSI reference model is Application, Presentation, Session, Transport, Network, Data link and Physical layer. OSI stands for Open System Interconnect and it is a generalized model.

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