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Module 1: Physical Layer & Data Communication

20232m

Which one of the following layers of abstraction is not present in the TCP/IP model but is included in the OSI model?
(i) Network layer
(ii) Transport layer
(iii) Session layer
(iv) Application layer

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Answer

(iii) Session layer

Explanation

The OSI model has separate Session and Presentation layers, whereas the traditional TCP/IP model combines their functions into its broader Application layer.

The Network, Transport, and Application functions are represented in both models, although the names and grouping differ. The Session layer is therefore the best answer among the options.

Final answer: (iii) Session layer.

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