A full length explanation of the OSI 7 layer model including the role of each layer and of the stack.
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In the late 1970s, one project was administered by the International Organization for Standardization (ISO), while another was undertaken by the International Telegraph and Telephone Consultative Committee, or CCITT (the abbreviation is from the French version of the name). These two international standards bodies each developed a document that defined similar networking models.
In 1983, these two documents were merged to form a standard called The Basic Reference Model for Open Systems Interconnection. The standard is usually referred to as the Open Systems Interconnection Reference Model, the OSI Reference Model, or simply the OSI model. It was published in 1984 by both the ISO, as standard ISO 7498, and the renamed CCITT (now called the Telecommunications Standardization Sector of the International Telecommunication Union or ITU-T) as standard X.200. (Source: Wikipedia)
This model defines how applications running upon network-aware devices may communicate with each other. The model is generic and applies to all network types, not just TCP/IP, and all media types, not just Ethernet. To read live application, check cricinfo page.
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