Which layers of the OSI reference model are host-to-host layers ?
All Layers Above the Transport Layer in OSI Reference Model.
Answer : Transport, Session, Presentation, Application
The Host-to-Host layer’s main purpose is to shield the upper-layer applications from the complexities of the network. This layer says to the upper layer, “Just give me your data stream, with any instructions, and I’ll begin the process of getting your information ready to send.