Abstract
Global connectivity is the capability of reaching and being reached by anybody in the world. A usable global connectivity for computers implies a hierarchical naming structure, the hiding of carriers, switches, physical addresses and routes, a similar use of public or private and international or local connections, and ease of connection of new users. There have been two lines of development in the last years: the CCITT recommendations X.25 (PLP) and X.121, and the ISO standard IP. IP is datagram oriented and X.25 is connection oriented. The requirements, including global connectivity, can be satisfied by two different protocol stacks: ISO-IP with TP4 and X.25 and TP0. These are discussed in detail and a slight preference for X.25 and TP0 is expressed.
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