If the connection fails, data can be lost as it does not provide an orderly connection release mechanism. Sends another data packet before receiving a confirmation packet of the previously sent packet. Since you have to guarantee sending and maintaining a connection, it becomes more complex than IPX. Poor performance in data transfer reliability over a network, compared to IPX. In July 1991 , Novell established a team of developers to create an improved version of SPX, called SPX II, after studying the disadvantages they had determined: It is used in local area networks, due to its efficiency for this purpose (its performance exceeds that of TCP / IP in a LAN). If an error is discovered in a packet that is sent or received within this window, packets sent or received during that time are marked bad and retransmitted. All this control is carried out in a confirmation list in a window. In case of not receiving this message, it retransmits the packet a certain number of times. If you still do not receive a response, it assumes that there has been a connection failure and closes the connection. SPX waits for a confirmation message (to control the sending of packets). It is mainly used for client / server applications . It controls the flow of data, regulating the speed at which packets are sent and received and reducing the risk of corruption. The SPX packet header is made up of 12 bytes connected over a 30-byte IPX header. It uses the IPX protocol as a messenger (which by itself lacks reliability during packet transport) allowing it to establish and maintain connections as well as send data. #Novell netware disadvantages Pc#
PC provides access to Internet applications, but has several disadvantages.
It is aimed at communications with a connection that is responsible for verifying that a message sent through a network reaches its destination intact, guaranteeing the integrity of the packets sent and the confirmation packets received. NetWare, Novells network operating system, provides shared file servers. 
SPX is a protocol of the transport layer . 
SPX is an old Novell network protocol from the NetWare operating system . It is used to control the delivery of data over a local area network using the IPX protocol. Its design is based on a protocol created by Xerox called SPP (Sequenced Packet Protocol), emerging in response to the high demand in the 1980s for applications with connection-oriented services. SPX . It is the acronym in English for Sequenced Packet Exchange. It is a protocol of the Transport Layer responsible for acting on the IPX protocol to ensure the delivery of packets.
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