The second edition of this book explains the essential building blocks of the OSI (open systems interconnection) model as described in recommendation ISO 7498, basic functions and tasks of the seven specified layers in a simple and clear way. It describes the history and the general concept of the model as described in ISO 7498 It describes the basic functions, tasks and services of each layer It gives examples of existing protocols for each layer It describes simple tasks of network elements like repeaters (or media converters), bridges, switches or routers within the associated layers of the model.
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