xns การใช้

• XNS was widely regarded as faster than IP due to this design note.
• These closely resembled the similar systems used in other XNS-based protocols.
• The protocol suite specifications for XNS were placed in the public domain in 1977.
• AppleTalk used XNS-like routing, but had incompatible addresses using shorter numbers.
• By SIGGRAPH 1984, XNS support was added, allowing play over an ethernet.
• Like Novell NetWare, VINES's network services were based on the archetypical Xerox XNS stack.
• A set of routing algorithms, however, set VINES apart from other XNS systems at this level.
• Some of the protocols in the XNS suite were lightly modified versions of the ones in the Pup suite.
• This meant that vendors using the XNS protocols all created their own solutions for file sharing and printer support.
• A wide variety of proprietary networking systems were directly based on XNS or offered minor variations on the theme.
• XNS was used unchanged by 3Com's 3 + Share and Ungermann-Bass's Net / One.
• XNS combined the OSI's Session and Transport layers into the single Interprocess Communications layer ( layer 2 ).
• Further development followed, resulting in the seminal Xerox Network Systems ( XNS ) protocol, which was completed by 1978.
• XNS was based on the earlier ( and equally influential ) PARC Universal Packet ( PUP ) suite from the late 1970s.
• XNS also implements a simple echo protocol at the internetwork layer, similar to IP's Protocol field of the IP header.
• Error correction could be optionally added at higher levels in the protocol stack, for instance, in XNS's own SPP protocol.
• This led to complete fragmentation of the XNS market, and has been cited as one of the reasons that IP easily displaced it.
• XNS provided the networking protocol as well as connections to the underlying Ethernet hardware it ran on, which Metcalf had also helped design.
• This helped XNS become the canonical local area networking protocol, copied to various degrees by practically all networking systems in use into the 1990s.
• XNS was developed by the Xerox Systems Development Department in the early 1980s, who were charged with bringing Xerox Parc's research to market.