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Module 1: Physical Layer & Data Communication

20162m

In the following pairs of OSI protocol layer/sub-layer and its Functionality, the INCORRECT pair is
(i) Network layer and Routing
(ii) Data Link Layer and Bit synchronization
(iii) Transport layer and End-to-end process communication
(iv) Medium Access Control sub-layer and Channel sharing

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Answer

(ii) Data Link Layer and Bit synchronization is the INCORRECT pair.

Explanation

Let's check each pair:

  • (i) Network layer — Routing: Correct. The Network layer determines paths through an internetwork and performs routing/forwarding-related functions.
  • (ii) Data Link Layer — Bit synchronization: Incorrect. Bit synchronization is primarily a Physical Layer function. The Physical layer is responsible for transmitting raw bits and maintaining synchronization between sender and receiver.
  • (iii) Transport layer — End-to-end process communication: Correct. The Transport layer provides end-to-end/process-to-process communication and may provide reliability, flow control, and error control.
  • (iv) MAC sub-layer — Channel sharing: Correct. The MAC sub-layer controls access to a shared transmission medium and determines when a device may transmit.

Therefore, the incorrect pair is (ii).

Final answer

(ii) Data Link Layer and Bit synchronization.

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