The OSI model defines internetworking in terms of a vertical stack of seven layers. Upper layers of the OSI model represent software that implements network services like encryption and connection management. Lower layers of the OSI model implement more primitive, hardware-oriented functions like routing, addressing, and flow control. Data communication in the OSI model starts with the top layer of the stack at the sending side, travels down the stack to the senders lowest (bottom) layer, then traverses the physical network connection to the bottom layer on the receiving side, and up its OSI model stack. The OSI model was introduced in 1984. Designed to be an abstract model and teaching tool, the OSI model remains a useful for learning about todays popular network technologies like Ethernet and protocols like IP.
Posted on: Mon, 18 Aug 2014 12:10:06 +0000
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