Osi Model Essay

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Question: Write a 2-3 page paper describing the OSI model and how it relates to a network. Your response should include answers to the following: • On which layers of the OSI model do WAN protocols operate? • What are some of these protocols? • On which OSI layers do switches and routers operate? • If routers reside at more than one layer, what is the difference between the OSI layers? Introduction: The OSI model was introduced in 1984. Although it was designed to be an abstract model, the OSI model remains a practical framework for today's key network technologies like Ethernet and protocols like IP. The OSI model defines internetworking in terms of a vertical stack of seven layers. The upper…show more content…
Finally, the application layer of System B passes the information to the recipient application program to complete the communication process. Interaction Between OSI Model Layers A given layer in the OSI model generally communicates with three other OSI layers: the layer directly above it, the layer directly below it, and its peer layer in other networked computer systems. The data link layer in System A, for example, communicates with the network layer of System A, the physical layer of System A, and the data link layer in System B. The following figure illustrates this example. [pic] Figure : OSI Model Layers Communicate with Other Layers On which layers of the OSI model do WAN protocols operate? A WAN protocols is a data communication protocols which is use in the data communications network that covers a relatively broad geographic area and that often uses transmission facilities provided by common carriers, such as telephone companies. WAN Protocol in WAN technologies, generally function at the lower three layers of the OSI reference model which layers are as following: • Physical layer • Data link layer, and • Network layer. Following figure illustrates the relationship between the common WAN technologies and the OSI model.

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