What is Sequenced Packet Protocol (SPP)?
SPP is a Xerox Network Systems (XNS) protocol for sequenced and connectionless package delivery support. It is a network transport protocol that provides reliable flow control packet delivery.
SPP is similar to the Transmission Control Protocol (TCP). An important technical difference is that SPP packets count sequence numbers but not bytes.
SPP manages several functions. It uses destination identification (ID) numbers for the destination definition of the transport link destination. It also uses sequence numbers for sent and sequenced package maintenance. SPP confirms assigned numbers for previous packets that ensure destination reception in addition to indicating successful transmission completion.
Novell's Internetwork Packet Exchange / Sequenced Packet Exchange (IPX / SPX) is derived directly from SPP.