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Which of the following layers is an addition to OSI model when compared with TCP IP model?

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Which of the following layers is an addition to OSI model when compared with TCP IP model?

(a) Application layer

(b) Presentation layer

(c) Session layer

(d) Session and Presentation layer

The question was posed to me during a job interview.

Question is from Reference Models topic in portion Computer Networks Introduction of Computer Network

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The correct choice is (d) Session and Presentation layer

The explanation: The only difference between OSI model and TCP/IP model is that the functions of Presentation and Session layer in the OSI model are handled by the transport layer itself in TCP/IP. OSI is a generalized model and TCP/IP is an application specific model.

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