2.3.5. Session Layer

The session layer, layer 5, characterizes the association from a client PC to a network server or from a companion PC on a network to another companion PC. These virtual associations are alluded to as sessions. They incorporate arrangement between the client and host (or peer and peer) on matters of stream control, exchange handling, exchange of client data, and authentication to the network. They are called sessions since they set up associations that endure for some timeframe.