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Module 1: Physical Layer & Data Communication

20192m

This layer is an addition to OSI model when compared with TCP/IP model:
(i) Application layer
(ii) Presentation layer
(iii) Session layer
(iv) Both session layer and presentation layer

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(iv) Both session layer and presentation layer

The OSI model has 7 layers while TCP/IP has 4 (or sometimes described as 5). The Application layer of TCP/IP absorbs the responsibilities of OSI's top three layers — Application, Presentation, and Session. So the Session and Presentation layers exist as distinct layers only in the OSI model; TCP/IP does not define them separately.

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