Beginning of Essay
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 communication that lets everyon ....

Middle of Essay
.... 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 layers. The layers are in two groups. The upper four layers are used whenever a message passes from or to a user. The lower three layers are used when any message passes through the ho ....