OSI Model Layer Protocol data unit (PDU) Function Host layers 7. Application Data High - level APIs, including resource sharing, remote file access 6. Presentation Translation of data between a networking service and an application; including character encoding, data compression and encryption / decryption 5. Session Managing communication sessions, i.e. continuous exchange of information in the form of multiple back - and - forth transmissions between two nodes 4. Transport Segment, Datagram Reliable transmission of data segments between points on a network, including segmentation, acknowledgement and multiplexing Media layers 3. Network Packet Structuring and managing a multi-node network, including addressing, routing and traffic control 2. Data link Frame Reliable transmission of data frames between two nodes connected by a physical layer 1. Physical Symbol Transmission and reception of raw bit streams over a physical medium
what are the 7 layers of osi model in networking
7. Application 6. Presentation 5. Session 4. Transport 3. Network 2. Data link 1. Physical