<P> The concept of a seven - layer model was provided by the work of Charles Bachman at Honeywell Information Services . Various aspects of OSI design evolved from experiences with the ARPANET , NPLNET , EIN , CYCLADES network and the work in IFIP WG6. 1 . The new design was documented in ISO 7498 and its various addenda . In this model , a networking system was divided into layers . Within each layer , one or more entities implement its functionality . Each entity interacted directly only with the layer immediately beneath it , and provided facilities for use by the layer above it . </P>
<P> The concept of a seven - layer model was provided by the work of Charles Bachman at Honeywell Information Services . Various aspects of OSI design evolved from experiences with the ARPANET , NPLNET , EIN , CYCLADES network and the work in IFIP WG6. 1 . The new design was documented in ISO 7498 and its various addenda . In this model , a networking system was divided into layers . Within each layer , one or more entities implement its functionality . Each entity interacted directly only with the layer immediately beneath it , and provided facilities for use by the layer above it . </P>
the number of layers in iso osi reference model
the number of layers in iso osi reference model
seven
seven