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OSI is a standard description or for how messages should be transmitted between any two points on a network. The defines seven layers that take place at each end of a communication. It is also valuable as a single reference view of communicati ....

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... related functions. Each user is at a computer equipped with these seven layers of function. So, in a given message between users, there will be a flow of data through each layer at one end down through the layers in that computer and, at the other end, when the message arrives, another flow of data up through the layers in the receiving computer. The actual programming and hardware that makes these seven layers of function is usually a combination of the computer OS, applications, TCP/IP and the software and hardware that enable you to put a signal on one of the lines attached to your computer. OSI divides communication into seven laye ...