<Li> Parameters reserved for future use, reflecting that the members agreed the facility should be provided, but could not reach agreement on how this should be done in the available time . </Li> <Li> Various inconsistencies and ambiguities will inevitably be found when implementing the standard . </Li> <P> International standards are reissued periodically to handle the deficiencies and reflect changing views on the subject . </P> <P> A lesson learned from ARPANET, the predecessor of the Internet, was that standardization of protocols is not enough, because protocols also need a framework to operate . It is therefore important to develop a general - purpose, future - proof framework suitable for structured protocols (such as layered protocols) and their standardization . This would prevent protocol standards with overlapping functionality and would allow clear definition of the responsibilities of a protocol at the different levels (layers). This gave rise to the OSI Open Systems Interconnection reference model (RM / OSI), which is used as a framework for the design of standard protocols and services conforming to the various layer specifications . </P>

What are the major communications protocols in use today