In the following pairs of OSI protocol layer/sub-layer and its functionality, the INCORRECT pair is
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Answer: B
Let us analyze the functionality of each layer and sub-layer mentioned in the options:
- Network Layer: Responsible for routing packets from the source host to the destination host across multiple networks. Thus, the pair Network layer and Routing is correct.
- Physical Layer: Responsible for bit representation, transmission rate, and bit synchronization (ensuring the sender and receiver clocks are synchronized at the bit level). The Data Link Layer, on the other hand, is responsible for framing/frame synchronization, error control, and flow control. Thus, the pair Data Link Layer and Bit synchronization is incorrect.
- Transport Layer: Responsible for process-to-process (end-to-end) delivery of the entire message. Thus, the pair Transport layer and End-to-end process communication is correct.
- Medium Access Control (MAC) Sub-layer: A sub-layer of the Data Link Layer that resolves access to a shared transmission medium (channel sharing). Thus, the pair Medium Access Control sub-layer and Channel sharing is correct.
Therefore, the incorrect pair is B.
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