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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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Answer

(iv) Both Session layer and Presentation layer

Explanation

The OSI model has 7 layers:

  1. Physical
  2. Data Link
  3. Network
  4. Transport
  5. Session
  6. Presentation
  7. Application

The traditional TCP/IP model has fewer layers. Its Application layer combines the responsibilities of the OSI Application, Presentation, and Session layers.

Therefore, when comparing the two models, the Session and Presentation layers are separate layers in OSI but are not separate layers in the traditional TCP/IP model.

Option analysis

  • (i) Application: Exists in both models, although its scope differs.
  • (ii) Presentation: Separate in OSI; its functions are incorporated into TCP/IP's Application layer.
  • (iii) Session: Separate in OSI; its functions are incorporated into TCP/IP's Application layer.
  • (iv) Both session layer and presentation layer: Correct.

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

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