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Module 1: Physical Layer & Data Communication

20212m

What layer in the TCP/IP stack is equivalent to the transport layer of the OSI model?

(i) Application
(ii) Host-to-host
(iii) Internet
(iv) Network access

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Answer

(ii) Host-to-host layer

Explanation

The OSI model has seven layers, while the TCP/IP model is commonly represented using four layers: Application, Host-to-Host (Transport), Internet, and Network Access.

The Transport layer of the OSI model provides end-to-end communication between processes. It handles functions such as segmentation, flow control, error control, and reliable delivery when TCP is used.

In the TCP/IP model, these responsibilities belong to the Host-to-Host/Transport layer.

Option analysis

  • (i) Application: Corresponds broadly to the OSI Application, Presentation, and Session layers.
  • (ii) Host-to-host: Correct. It corresponds to the OSI Transport layer.
  • (iii) Internet: Corresponds to the OSI Network layer.
  • (iv) Network access: Covers functions associated broadly with the OSI Data Link and Physical layers.

Final answer: (ii) Host-to-host.

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