Layer 5 - Session Layer
The session layer establishes, manages, and terminates sessions between applications. This includes starting, stopping, and re-synchronizing two computers that are having a "rap session". The session layer coordinates applications as they interact on two communicating hosts. Data communications travel on packet-switched networks, not like telephone calls that travel on circuit-switched networks. Communication between two computers involves many mini-conversations, thus ensuring that the two computers can communicate effectively. One requirement of these mini-conversations is that each host plays dual roles: requesting service - like a client; and, replying with service - like a server. Determining which role they are playing at any given moment is called dialogue control.
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