> Eric Tomson wrote: > I think that such terms as "Internet", "Intranet" and > "Extranet" DO owe their existence to the wide > implementation and use of TCP/IP. > So - IMHO - you don't have to worry about TCP/IP to > "survive" and "compete" (particularly against SPX/IPX > and NetBIOS/NetBEUI). ;) > TCP/IP DOES RUN on any Intranet, Extranet and Internet, > because - by definition - they DO RUN TCP/IP. > Regarding OSI, just consider it as a theoretical > reference model particularly well-fitted for training > purposes (even if it's NOT limited to that), if this > can ease your mind. :) > P.S.: on the other hand, I don't think TCP/IP needs to be > "protected". It only needs a smooth migration to IPv6. I Agree with Eric (BTW Eric I stole your PDU names for the OSI model, they're better than mine). This has nothing to do with the protocol suite, but with model semantics. Michel.