Communication model : In the early days of computer networking, various manufacturers made communication software in their own way. Due to the different protocols of these hardware-based software, the software made by one company could not exchange data with the software made by another company. This would be a big problem. Later, a committee was formed from ISO (International Standard Organization) to eliminate this problem. This committee created a protocol model called OSI (Open System Interconnection) to create standard standards for harmonizing all communication software. This model is known as communication model. OSI (Open System Interconnection) Model: The OSI model describes how communication between computers and other networking devices will be developed. The International Organization for Standards (ISO) started working on this model in 1974. The need for the OSI model is felt so that different networking device manufacturers can produce their devices following the same sta
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