TCP/IP

the presentation layer and session layer are two layers that exist in the OSI model but do not exist in the TCP/IP model. these twon layers perform certain specific functions. but since they were absent in the TCP/IP model, then who performs the function in the TCP/IP model? are they not implemented at all? or are they implemented elsewhere?
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More about tomshardware
  1. What is this, getting Mom to do your homework ?
  2. the TCP has to do more in the interconnection that has to be uploaded by some one that knows more on interconnection
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