CompTIA Network+ Exam Guide by Wei Zhang, Ilya Shmulevich PDF

By Wei Zhang, Ilya Shmulevich

ISBN-10: 0387262873

ISBN-13: 9780387262871

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Com/forums. You need to register to participate (though not to read posts), but that’s only to keep the spammers at bay. The forums provide an excellent resource for answers, suggestions, and just socializing with other folks studying for the exam. org. Good luck! 1 Explain the function of each layer of the OSI model To achieve these goals, you must be able to • Define the OSI seven-layer model • Explain the major functions of network hardware • Describe the functions of network software The CompTIA Network+ certification challenges you to understand virtually every aspect of networking—not a small task, but luckily for you there’s a long-used method to conceptualize the many parts of a network called the Open Systems Interconnection (OSI) seven-layer model.

Never fear—I’ll show you. Visualize the network protocol software as a layer between the system’s software and the NIC. When the IP network protocol gets hold of data coming from your system’s software, it places its own frame around that data. We call this inner frame an IP packet, so it won’t be confused with the frame that the NIC will add later. Instead of adding MAC addresses to its packet, the network protocol adds sending and receiving IP addresses. Figure 2-30 shows a typical IP packet; notice the similarity to the frames you saw earlier.

On the left, all the computers connect to a single hub. On the right, however, the LAN is separated into two five-computer subnets. Figure 2-26 Large LAN complete (left) and broken up into two subnets (right) Chapter 2: Building a Network with the OSI Model 29 EXAM TIP MAC addresses are also known as physical addresses. To move past the physical MAC addresses and start using logical addressing requires some special software, usually called a network protocol. Network protocols exist in every operating system.

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CompTIA Network+ Exam Guide by Wei Zhang, Ilya Shmulevich


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