OSI/ISO reference model in communication system
OSI/ISO reference model in communication system Layer 1 (Physical): This layer considers only the physical aspects of a network; the cables, converters, interconnecting devices, etc. Layer 2 (Data-link): This layer concerns itself with how Layers 1 and 3 work together. Layer 3 (Network): This layer provides an addressing scheme for routing of data and messages. Layer 4 (Transport): This layer makes sure that messages get to their correct destination. Layer 5 (Session): This layer handles the actual connections between systems. Layer 6 (Presentation): This layer deals with the way different systems represent data. Layer 7 (Application): This layer concerns itself chiefly with the software applications used on a computer screen