Sequenced Packet Exchange (SPX)

What is Sequenced Packet Exchange (SPX)?
Sequenced Packet Exchange (SPX) is a network packet sequencing protocol used with Novell NetWare. Internetwork Packet Exchange (IPX) handles SPX packet forwarding.

NetWare communication requires a transport protocol supported by NetWare Core Protocol (NCP); B. IPX / SPX, TCP / IP, or both.
SPX is mainly used for client / server applications to provide connection-oriented network services that are similar to TCP / IP. SPX sits over IPX, a network layer protocol.

IPX / SPX is derived from Internet Datagram Protocol (IDP) and Sequenced Packet Protocol (SPP), which are Xerox Network Systems protocols that provide routing capabilities and support for sequenced and connectionless packet delivery.

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Further explanations for the first letter S.