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Essay on OSI Model

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OSI Model During the past two decades there has been a tremendous increase in the numbers and sizes of networks. Many of the networks, however, were built using different implementations of hardware and software. As a result, many of the networks were incompatible and it became difficult for networks using different specifications to communicate with each other. To address this problem, the International Organization for Standardization (ISO) researched many network schemes. The ISO recognized that there was a need to create a network model that would help network builders implement networks that could communicate and work together (interoperability) and therefore, released the OSI reference model in 1984. This chapter explains how …show more content…

This motion of objects, whether it is physical or logical, is referred to as flow. There are many layers that help describe the details of the flow process.

Other examples of systems that flow, are the public water system, the highway system, the postal system, and the telephone system. Now examine the Figure "Comparing Networks" chart. What network are you examining? What is flowing? What are the different forms of the object that is flowing? What are the rules for flow? Where does the flow occur? The networks listed in this chart give you more analogies to help you understand computer networks. Another example of how you might use the concept of layers to analyze an everyday subject is to examine human conversation. When you create an idea that you wish to communicate to another person, the first thing you do is choose how you want to express that idea, then you decide how to properly communicate it, and finally, you actually deliver the idea. Imagine a young boy seated at one end of a very long dinner table. On the other end of the table, quite a distance away, sits the young boy's grandmother. The youngster speaks English. The grandmother prefers to speak Spanish. The table has been set with a wonderful meal that the grandmother has prepared. Suddenly the young boy shouts at the top of his lungs, "Hey, you! Give me the rice!" and reaches across the table to grab it. In most places, this action is considered quite rude. What

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