11-09-2017, 03:38 PM
The open system interconnection model (OSI model) is a conceptual model that characterizes and standardizes the communication functions of a telecommunications or computing system without taking into account its underlying internal structure and technology. Its objective is the interoperability of various communication systems with standard protocols. The model divides a communication system into layers of abstraction. The original version of the model defined seven layers.
A layer serves the layer on it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the required path for applications on it, while calling the next lower layer to send and receive packets that comprise the content of that route. Two instances in the same layer are displayed connected by a horizontal connection in that layer. The model is a product of the International Organization for Standardization (ISO) Open Systems Interconnection project, maintained by the ISO / IEC 7498-1 identification.
OSI (Open Systems Interconnection) is a reference model on how applications can communicate over a network. A reference model is a conceptual framework for understanding relationships. The purpose of the OSI reference model is to guide marketers and developers so that the digital communication products and software programs they create interoperate and to facilitate clear comparisons between communication tools. Most providers involved in telecommunications attempt to describe their products and services in relation to the OSI model. And while it is useful for guiding discussion and evaluation, OSI is rarely actually implemented, since few network products or standard tools keep all the related functions together in well-defined layers related to the model. TCP / IP protocols, which define the Internet, do not correlate neatly with the OSI model.
A layer serves the layer on it and is served by the layer below it. For example, a layer that provides error-free communications across a network provides the required path for applications on it, while calling the next lower layer to send and receive packets that comprise the content of that route. Two instances in the same layer are displayed connected by a horizontal connection in that layer. The model is a product of the International Organization for Standardization (ISO) Open Systems Interconnection project, maintained by the ISO / IEC 7498-1 identification.
OSI (Open Systems Interconnection) is a reference model on how applications can communicate over a network. A reference model is a conceptual framework for understanding relationships. The purpose of the OSI reference model is to guide marketers and developers so that the digital communication products and software programs they create interoperate and to facilitate clear comparisons between communication tools. Most providers involved in telecommunications attempt to describe their products and services in relation to the OSI model. And while it is useful for guiding discussion and evaluation, OSI is rarely actually implemented, since few network products or standard tools keep all the related functions together in well-defined layers related to the model. TCP / IP protocols, which define the Internet, do not correlate neatly with the OSI model.