Open Systems Interconnect ( OSI) Model The International Standards Organization (ISO) developed a theoretical model of how networks should behave and how they are put together. This model is called the Open Standards Interconnect (OSI) Model. The OSI Model is a theoretical, seven-layered model of how networks work . The OSI Model is a theoretical model of networking that organizes network functions into seven layers, Physical layer Datalink layer Network layer Transport layer Session layer Presentation layer Application layer It specifies the communication interfaces between the OSI Model's layers and between network endpoints utilizing an OSI Model-based protocol suite. The OSI Model is a way of thinking about how networks work. The OSI Model is a theoretical model The OSI Model is not a technology . The OSI Model is not a protocol . The OSI Model is not a program or software . The OSI Model sorts network communication functions into seven layers. ...