Computer Sciences > GATE 2014 SET-3 > OSI Model
In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is
Correct : b
The Network layer is responsible for routing, so this is correct.
Bit synchronization is actually a function of the Physical layer, not the Data Link layer. The Data Link layer manages framing, error detection, and frame synchronization — not bit timing — so this makes the pair incorrect.
The Transport layer ensures end-to-end process communication, so this is correct.
The Medium Access Control (MAC) sub-layer is responsible for channel sharing and deciding which device can use the channel at a given time, so this is correct.
✅ Final Answer: Option (b) — Data Link Layer and Bit synchronization.
Reason: Bit synchronization is handled by the Physical layer, not the Data Link layer.
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