Provides an architectural model of the OSI Network Layer as a frame for OSI Network Layer standardization. Is intended for use in the design and applicable of Network Layer protocols. To be used to provide a common set of concepts and terminology for Network Layer standards, to analyse Network Layer functionality and classify Network Layer protocols, to specify the use of "real network" in supporting or providing the OSI Network Service, above all, in cases where multiple "real network" are to be interconnected and used.