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?
What is this, getting Mom to do your homework ?
the TCP has to do more in the interconnection that has to be uploaded by some one that knows more on interconnection