CHAPTER FOUR OSI Model and Network Protocols
The OSI Seven-Layer Model 135 FIGURE 4.1 The OSI seven-layer model. EXAM ALERT On the Network+ exam, you might see an OSI layer referenced either by its name, such as data link, or by its layer number. For instance, you might find that a router is referred to as a Layer 3 device. Each layer of the OSI model has a specific function. The ...
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