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The main purpose use of the OSI model is to help network designers understand the function of each layer are associated with the flow of data communications. Including the types and methods of transmission network protoklol. The model is divided into 7 layers, with the characteristics and functions of each. Each layer must be able to communicate with the layer above it and below it directly through a series of protocols and standards.
Application Layer: Provides services for user applications. This layer is responsible for the exchange of information between computer programs, such as e-mail programs, and other service roads on the network, such as a printer server or other computer applications.

Presentation Layer: Concerned with how data is converted and formatted for data transfer. Example conversion of ASCII text format for documents,. Gif and JPG for images. This layer performs code conversion, data translation, encryption and conversion. Session Layer: Determines how two devices establish, maintain and manage a connection - how they talk to each other. These connections are called "session".

Transport Layer: Responsible for breaking data into segments, logical connection "end-to-end" between the terminals, and provide error handling (error handling).

Network Layer: Responsible for determining the network address, specify the route to be taken during the trip, and keep the network traffic congestion. The data on this layer-shaped package.
Data Link Layer: Provides links to data, packaged into frames associated with the "hardware" and then transported through the medium of communication with the network card, set the physical layer communications between connecting systems and error handling.

Physical Layer: Responsible for the process data into bits and transfers them via the media, like cable, and maintain the physical connection between systems.