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The answer is conceptual model
It's may be known as: The7 layers model
its named Tcp/Ip model in some ref.
CONCEPTUAL MODEL.
or Tcp/Ip model
I think its TCP/IP model, same a OSI model
CONCEPTUAL MODEL OR ISO/OSI MODEL
There is the DoD four-layer model which stands for Department of Defense four-layer model.
there is a4 layered TCP/IP DoD Model.. Application, (Application,Presentation,Session), Host to Host( Transport) Internet( Network) & network Access layer(Data link & Physical)