Copyright 2002 by
Prentice Hall, Inc.
6-5
OSI Reference Model
nThe worldwide telephone system has been so effective in connecting people because it has been based on common standards worldwide.
nClosed vs. open networks: closed network - one that is offered by one supplier and to which only the products of that supplier can be attached.  Open networks are based on international standards so products of many manufacturers can be attached.
nSeven layer OSI reference model guides the development for computer networks.