Discussion
Which layer of the OSI model has the function of providing authorization to the correct user ?
Answer: D
In the textbook account of the OSI model, authorization is a function of the session layer.
The session layer (layer 5) establishes, manages and terminates sessions between two communicating applications. Setting up a session includes checking who the user is and whether that user is allowed to open the session, which is why textbooks list authentication and authorization among its functions, together with dialogue control and synchronisation.
The transport layer handles reliable end-to-end delivery of data, the presentation layer handles translation, encryption and compression of data, and the application layer provides network services to the user's applications. None of them is the layer this classification gives authorization to.
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