SPX (Sequenced Packet Exchange) is the protocol for handling packet sequencing in a Novell NetWare network. SPX prepares the sequence of packets that a message is divided into and manages the reassembly of received packets, confirming that all have been received and requesting retransmission when they haven't. SPX works directly with the Internetwork Packet Exchange (IPX), which manages the forwarding of packets in the network.
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IPX/SPX are comparable to the basic Internet protocols, Internet Protocol and Transmission Control Protocol.