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ccna premium.. Provides a teaching tool that helps network administrators understand the process of communication between network components.Exam Essentials.Keep in mind that the OSI reference model provides benefits that include: interoperability, simplification, modular design, and training.PCs are typically modular devices; for example, PCs typically contain the following components: case, motherboard, processor, monitor, keyboard, mouse, hard disk, optical drive, RAM, display card, network card, and so on. If one of these components fails, it is easy to determine which one has failed and replace it. This simplifies the troubleshooting process. Similarly, when a new optical drive comes on the market, you can use it without replacing your computer-you just connect it with a cable and install the drivers, and you can use it. stack.Authentication Objectives 2.022.2 Layers of the OSI Reference ModelThe OSI reference model contains seven layers as shown in Figure 2.1: the application layer, the representation layer, the session layer, the transport layer, the network layer, the data link layer, and the physical layer. The functionality of the application, representation, and session layers is typically provided by the applications that users use, such as the Web browsers Firefox and Internet Explorer, and the e-mail application Microsoft Outlook. The transport layer, network layer, data link layer, and physical layer are responsible for transporting data and information between these higher layers.When troubleshooting connections between network components, it is critical to understand the function of each layer of the OSI reference model. Understanding the function of each layer will make troubleshooting much easier using tools specific to each layer.Layer 7 Application LayerLayer 6 Representation Layer