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how applications can communicate with each other over a network
it is conceptual model it has7 layers from bottom to up
7. Application layer
6. Presentation layer
5. Session layer
4. Transport layer
3. Network layer
2. Data link layer
1. Physical layer
The seven layers use to establish the connection through3-way handshaking between client program and server program are called7-layers O.S.I model. It includes application, presentation, session, transport, network, data-link and physical(only touchable layer).
