The document discusses the OSI model, describing its layers and their functions. It includes figures illustrating the OSI model layers, an exchange using the OSI model, the physical layer, data link layer with an example, and the network layer.

1. Chapter 3
OSI
Model
• The model
• Functions of the layers
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2. Figure 3-1
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OSI Model

3. Figure 3-2
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OSI Layers

4. Figure 3-3
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An Exchange Using the OSI Model

5. Figure 3-4
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Physical Layer

6. Figure 3-5
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Data Link Layer

7. Figure 3-6
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Data Link Layer Example

8. Figure 3-7
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Network Layer