The OSI Model

International Organization for Standardization (ISO) was originally created and designed the OSI model in order to provide a framework / work concept to build a suite of open systems protocols. The purpose of the OSI model he designed, that sets the protocol to be used in developing an international network system will not rely on proprietary systems.

OSI Protocol Suite development and acceptance are still lagging behind, because the speed at which Internet-based TCP/IP was adopted as well as the rate at which it expanded. Seven layers of the OSI model has effect and contribute to the development of protocols for all kinds of new network although some of the protocols developed using the OSI specifications are common nowadays.

The OSI model describes the interaction of each layer with the layer directly above and below it. In this guide also will be structured around the OSI Model the focus of the discussion will be identified in the protocol TCP/IP protocol stack. This is related to the OSI model as a reference model, the OSI model provides an extensive list of functions and services that can occur at each layer. Keep in mind that the model layer TCP/IP is usually called only by name, while the seven layers of the OSI model is often called the number of names.

• The Application layer provides the means for end to end connectivity between individuals in the human network using data network.
• The Presentation layer provides for common representation of the data transferred between Application layer services.
• The Session layer provides services to the Presentation layer to organize it's dialogue and to manage data exchange.
• The Transport layer defines services to segment, transfer, and reassemble the data for individual communications between the end devices.
• The Network layer provides services to exchange the individual places of data over the network between identified end devices.
• The Data Link layer protocols describe methods for exchanging data frames between devices over a common media.
• The Physical layer protocols describe the mechanical, electrical, functional, and procedural means to activate, maintain, and deactive physical connections for bit transmission to and from a network device.

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