TCP/IP and OSI Architecture Similarities & Difference

TCP/IP and OSI Architecture Similarities & Difference
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Answer :

TCP/IP and OSI Architecture Similarities & Difference
ISO-OSI Architecture has following layers:
Physical Layer
Data Link Layer
Network Layer
Transport Layer
Session Layer
Presentation Layer
Application Layer
TCP/IP Architecture has following layers:
Host to Network Layer
Internet Layer
Transport Layer
Application Layer
Similarities between TCP/IP & OSI Architecture:
Both models are based on concept of "Stack of Independent Protocols"
All the layers from bottom till Transport Layer provides End to End Transport Service
All the layers above the Transport Layer are application oriented and use the Transport Service

Difference between TCP/IP & OSI Architecture:
The protocols in ISO are better hidden and can be replaced relatively easily as technology changes
OSI supports both connectionless and connection oriented communication in network layer but only connection oriented communication in the transport layer. TCP/IP supports only connectionless communication in the network layer and both connectionless and connection oriented communication in the transport layer
The ISO model has 7 layers whereas the TCP/IP model is composed of 4 layers
The TCP/IP the protocol cam first and the model was made based on the protocol. ISO-OSI the model was devised before the protocols were inverted
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