Discussion

Identify the ONE CORRECT matching between the OSI layers and their corresponding functionalities as shown.

OSI Layers	Functionalities
(a) Network layer	(I) Packet routing
(b) Transport layer	(II) Framing and error handling
(c) Datalink layer	(III) Host to host communication

Answer: B

The correct matching is (a)-(I), (b)-(III), (c)-(II).

The network layer routes packets from source to destination across networks, using logical (IP) addresses: (a)-(I).
The transport layer provides end-to-end, host-to-host (process-to-process) communication, with segmentation, flow control and reliability as in TCP: (b)-(III).
The data link layer groups bits into frames and detects errors on a single link, for example with a CRC: (c)-(II).

Option A gives framing to the transport layer, and C and D give routing to the transport or data link layer, so each misplaces at least two layers.

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