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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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(ii) Data Link Layer and Bit synchronization

Bit synchronization (ensuring sender and receiver clocks agree on bit timing/boundaries) is a Physical layer function, not a Data Link layer function. The Data Link layer's actual jobs are framing, error control, flow control, and media access control — not raw bit-level timing.

The other pairs are correct: Network layer does routing; Transport layer does end-to-end communication; the MAC sub-layer handles channel sharing.

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