The Layers and What They Represent
Let’s run through the layers and an overview of their tasks and responsibilities. Figure 1.12 summarizes the layers and their functions.
FIGURE 1.12 The seven-layer OSI model
Layer 1: Physical Layer
Layer 1 of the OSI model, the Physical layer, defines the network standards relating to the electrical signals that travel the network cables, the connectors, and the media types (cables) themselves. The Physical layer also determines the way that data is placed on the network media.
For the CompTIA Network+ exam, you need to know examples of components that run at each layer of the OSI. Examples of network ...
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