Jarvis @ JM.me

OSI Model

May 28 · 4min

Light brief on OSI model

OSI model
LayerProtocol data unit (PDU)Function
7ApplicationDataHigh-level protocols such as for resource sharing or remote file access, e.g. HTTP
6PresentationTranslation of data between a networking service and an application; including character encoding, data compression and encryption/decryption
5SessionManaging communication sessions, i.e., continuous exchange of information in the form of multiple back-and-forth transmissions between two nodes
4TransportSegment, DatagramReliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing
3NetworkPacketStructuring and managing a multi-node network, including addressing, routing and traffic control
2Data linkFrameTransmission of data frames between two nodes connected by a physical layer
1PhysicalBit, SymbolTransmission and reception of raw bit streams over a physical medium
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