The following are the WAN protocols;
SNA
Systems Network Architecture (SNA) is a data communication architecture established by IBM to specify common conventions for communication among the wide array of IBM hardware and software data communication products and other platforms. Among the platforms that implement SNA in addition to mainframes are IBM’s Communications Server on Windows, AIX, and Linux, Microsoft’s Host Integration Server (HIS) for Windows, and many more.
The way in which products internally implement these common conventions can differ from one product to another, but because the external interface of each implementation is compatible, different products can communicate without the need to distinguish among the many possible product implementations.
SNA products recognize and recover from loss of data during transmission, use flow control procedures to prevent data overrun and avoid network congestion, identify failures quickly, and recover from many errors with minimal involvement of network users. SNA products also increase network availability through options such as the extended recovery facility, backup host, alternative routing capability, and maintenance and recovery procedures integrated into workstations, modems, and controllers.
TCP
TCP/IP is a communication protocol used between physically separated computer systems. TCP/IP can be implemented on a wide variety of physical networks.
TCP/IP is a large family of protocols that is named after its two most important members, Transmission Control Protocol and Internet Protocol. Figure 1 shows the TCP/IP protocols used by CICS® ONC RPC in terms of the layered Open Systems Interconnection (OSI) model. For CICS users, who may be more accustomed to SNA, the left side of Figure 1 shows the SNA layers that correspond very roughly to the OSI layers.
Figure 1. TCP/IP protocols compared to the OSI and SNA models
Leave a Reply
You must be logged in to post a comment.