The OSI seven reference tutorial for beginners and CISA CISSP candidates. en.wikipedia.org The Open System Interconnection Reference Model (OSI Reference Model or OSI Model) is a layered abstract description for communications and computer network protocol design. It was developed as part of the Open Systems Interconnection (OSI), the initiative was launched. [1] In its simplest form, divides network architecture into seven layers, from top to bottom, are the application, presentation,Session, Transport, Network, Data Link and Physical layers. E 'often referred to as layer OSI model Seven. A layer is a set of functions that are conceptually similar services to layer above it and receives services from the layer below. In one case, each layer provides services for instances of the higher level of service required by the layer below. For example, a level that provides error free communication over a network provides the necessary pathquestions about her packages when she next lower layer to send and receive the contents of the calls route. Conceptually, two instances on one layer are connected by a horizontal connection protocol at this level.
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