Match the following: List I List II K. Network Layer P. Dialog control L.…

Concept: in the OSI reference model each layer owns a distinct scope of delivery or dialogue, and the three layers listed here are separated exactly by that scope.

• The network layer is responsible for source-to-destination delivery: it carries a packet from the original source host to the final destination host, across as many intermediate networks and routers as the path requires.

• The transport layer is responsible for process-to-process delivery: it hands the complete message to the correct application process on the destination host, identified by a port number, so its scope is narrower than the host it runs on.

• The session layer is the dialogue controller of the model: it establishes, maintains and synchronizes the conversation between two communicating systems, including dialog control (whether the exchange is half duplex or full duplex) and synchronization checkpoints.

Application: applying each definition to the three layers in the question gives one pairing per layer.

The required matching is therefore K-Q, L-R, M-P.

Cross-check: the three scopes form a ladder, and contrasting them with their neighbours confirms that no other pairing survives.

• Hop-to-hop (node-to-node) delivery belongs to the data link layer, not to the network layer; the network layer's job begins where a single link ends and spans the whole path between the two end hosts.

• Only the transport layer uses port numbers, so only it can address an individual process; that is precisely why process-to-process delivery sits one level above host-to-host delivery and cannot belong to the network layer.

• The session layer performs no delivery of its own; it manages the conversation on top of an already-established transport connection, which is why dialog control cannot be assigned to either the network or the transport layer.