OSI Reference Model


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OSI Reference Model

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A final section presents four case studies and questions, and an appendix covers the OSI reference model, TCP/IP architecture, and numeric conversion.
The network interface then becomes responsible for performing some or all of the functions corresponding to layers one through five of the OSI reference model (see Figure 2).
The OSI Reference Model provides the basis for much of what goes on in the data world.
The OSI reference model is generally considered in two parts: Layers 1 through 4 (Physical through Transport) form the "network" part.
This will be limited to the definition of the Application Service and Application Protocol provided by the Application Layer of the OSI Reference model supported by presentation connectionless-mode transmission.
The overall IEEE 802 standards consist of a group of final and proposed specifications for LANs that deal with the physical and link layers of the OSI reference model.
The upper three layers are processing-oriented, while the middle layer is responsible for making sure the information is delivered from the sending to the receiving system (see, "Update on the OSI Reference Model.