Part 09 – Layer 5 and 6 Session and Presentation


We’re almost at the summit of the OSI model as we examine layers 5 and 6, otherwise known as the session and presentation layers respectively.

The session layer is responsible for establishing connections between applications that reside up at layer 7. It uses a negotiation procedure or handshake to setup, transfer data (maintenance), and tear down the connection or session. The terms connection and session are often used interchangeably.

The presentation layer handles file-level encryption, compression, and formatting duties. Universal file formats such as gif, jpeg, and mp3 are defined at layer 6.

This is a brief video and the key point to remember, and one that is certainly testable, is that no protocols exist at layer 6. This is striking since even the layer 1 physical layer has protocols as they relate to media such as cables and wiring.

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