reference models || network architectures

Reference Models in Communication Networks
The most important reference models are :

1. OSI reference model:- has 7 layers
       
         7. Application layer
         6. Presentation layer
         5. Session layer
         4. Transport layer
         3. Network layer
         2. Data link layer
         1. Physical layer

2. TCP/IP reference model:-
       
         4. Application layer
         3. Transport layer
         2. Network layer / Internet layer
         1. Physical layer / Host-to-network layer

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