OSI Model
OSI Model – The model is similar in structure to that of SNA. It consists of seven architectural layers: the Physical Layer and Data Link Layer, the Network Layer, the Transport Layer, the Session Layer, the Presentation Layer, the Application Layer. OSI Model Physical and Provides the same functions as their SNA counterparts Data Link Layers (physical control and data link control layers. Network Layer Selects routing services, segments blocks and messages, and provides error detection, recovery, and notification. Transport Layer Controls point-to-point information interchange, data packet size determination and transfer, and the connection/disconnection of session entities. Session Layer Serves to organize and synchronize the application process dialog between presentation entities, manage the exchange of data (normal and expedited) during the session, and monitor the establishment/release of transport connections as requested by session entities.
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