The Sequence Packet Switching Protocol (SPX) is a Novell legacy transport layer protocol, providing packet delivery services for Novell NetWare networks. SPX is based on Xerox Sequence Group Protocol (SPP: SEQUENCED PACKET Protocol). SPX is running on IPX, primarily for Novell NetWare (before the NetWare 5.0) system to implement the communication service of the application on the server on the server. For example, Btrieve (ISAM Manager). SPX and TCP implement the same function. The latest version of NetWare service is currently running on TCP / IP.
After receiving the packet from the network, the IPX is received to the SPX from the network. SPX ensures that the complete packet is received and sequences them, and the copy packet is eliminated. SPX prepares packet sequences of packet information and is responsible for controlling the restructuring process of the received packets to confirm that all packets have been received, and if no retransmission operations request. SPX can work directly with the Internet Packet Exchange Protocol (IPX) of the management network packet forwarding process. SPX does not support file server connection services, and the connection of the file server is implemented by the NetWare Core Protocol (NCP). The SPX extension protocol is SPX-II (SPX2).
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