Discussion
Which layers of the OSI reference model are host-to-host layers ?
Answer: A
The host-to-host layers are transport, session, presentation and application.
In the grouping used in the key, the lower layers handle the network between adjacent nodes, and the upper four layers work end to end between the two hosts.
The other options include the physical, data-link or network layer, which are node to node or network layers. Layers 5 to 7 and the transport layer work between the end systems, while layers 1 to 3 work hop by hop through the network, so they are not host-to-host layers. This is the distinction the question rests on.
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