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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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Answer

(iv) Both Session layer and Presentation layer

Explanation

The OSI model contains seven layers, while the traditional TCP/IP model groups several OSI functions together.

The OSI Presentation layer handles functions such as data translation/format conversion, encryption/decryption, and compression. The OSI Session layer handles session establishment, management, synchronization, and termination.

In the TCP/IP model, these functions are generally incorporated into the broader Application layer rather than represented as separate Presentation and Session layers.

Therefore, both the Session and Presentation layers are separate additions in the OSI model when compared with the traditional TCP/IP model.

Final answer: (iv) Both session layer and presentation layer.

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