The basic difference that can easily be observed in above two reference models is that that OSI modeled at
7 layers whereas, TCP/IP has 5 layers. The major reason for this is believed to be because- 1.TCP/IP has more than 1 transport layer protocols. (Example-UDP, TCP, SCTP)
2. Unlike in OSI model, application layer in TCP/IP is not just one piece of software, rather several applications can be developed at this layer.
Layers in OSI model specify functionalities belonging to that layer. TCP/IP model contain relatively independent protocols that can be mixed if the system demands.
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