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Module 1: Physical Layer & Data Communication

20182m

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

TCP/IP's Application layer merges the functionality of OSI's Session, Presentation, and Application layers into one. So Session and Presentation exist only as explicit, separate layers in the OSI model.

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