Discussion
Which layers of the OSI reference model are host to host layers ?
(i) Transport layer
(ii) Network layer
(iii) Session layer
(iv) Data link layer
Answer: C
The host-to-host layers among those listed are (i) and (iii): the transport and session layers.
The OSI model is often divided into the lower 'media' layers (physical, data link and network), which move data across the network hop by hop, and the upper 'host' layers (transport, session, presentation and application), which operate end to end between the two communicating hosts. The transport layer provides end-to-end delivery and the session layer manages the dialogue between them.
The network and data link layers work between neighbouring nodes and routers along the path, so options including (ii) or (iv) are wrong.
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