8.6 Networking Protocols and the OSI Model
8.6.4 Internetwork Packet Exchange/Sequenced Packet Exchange
Internetwork Packet Exchange/Sequenced Packet Exchange (IPX/SPX) is the protocol suite employed originally by NovellŽ Corporations Network Operating System, NetWareŽ. It delivers functions similar to those included in TCP/IP. In order to enable desktop client systems to access NetWare services, Novell deployed a set of application, transport, and network protocols. Although NetWare client/server systems are not tied to particular hardware platforms, the native, or original, NetWare protocols remained proprietary. Unlike TCP/IP, the Novell IPX/SPX protocol suite remained the property of one company. As a result of the market pressure to move to an industry standard way of building networks, IPX/SPX has fallen into disfavor among customers. Novell in its current releases supports the TCP/IP suite. There remains, however, a large installed base of NetWare networks that continue to use IPX/SPX.

Common examples of some of the protocol elements included in the Novell IPX/SPX protocol suite include:

  • Service Advertising Protocol (SAP)
  • Novell Routing Information Protocol (Novell RIP) 
  • Netware Core Protocol (NCP) 
  • Get Nearest Server (GNS) 
  • Netware Link Services Protocol (NLSP)

A detailed discussion of the role and functions played by these protocol elements in networking and internetworking are not within the scope of this chapter.