CS402 (2020.B.01): The OSI Reference Model

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• the OSI reference model defined in [X200] is divided in seven layers.

• The Session layer contains the protocols and mechanisms that are necessary to organize and to synchronize the dialogue and to manage the data exchange of presentation layer entities

• The four lower layers are similar to the four lower layers described above. The OSI reference model refined the application layer by dividing it in three layers:

• The Presentation layer was designed to cope with the different ways of representing information on computers. There are many differences in the way computers store information.

• he Application layer that contains the mechanisms that do not fit in neither the Presentation nor the Session layer. The OSI Application layer was itself further divided into several generic service elem

• The TCP/IP reference places the Presentation and the Session layers implicitly in the Application layer

• implicitly