OSI Model

This general overview of the Open System Interconnection (OSI) model lays the foundation for the rest of this book, but do not consider it exhaustive. The OSI model defines a networking framework in seven layers. Control of the data passes from one layer to the next, starting at the sending station's application layer, and then working down through the model, to the bottom layer. Control of the data then passes across the physical connection between each station along the path and then back up the model layers to the top layer at the receiving (destination) station. Figure 2-1 shows this process.

Figure 2-1. OSI Model Sending and Receiving

In the networking environment, the OSI is the universal model and is made up of seven layers, ...

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