Systems Network Architecture (SNA), IBM's proprietary networking architecture, has reached a position of prominence in the computer industry based on its completeness and its continued support by IBM. SNA's architecture was a primary basis for the OSI Reference Model, which was created a decade after SNA's introduction. SNA has been expanded to accommodate evolution in computer networking and include support for peer-to-peer networks as well as certain standardized network media and protocols.
Advanced Peer-to-Peer Networking (APPN)
Advanced Peer-to-Peer Networking. Enhancement to the original IBM SNA architecture. APPN handles session establishment between peer nodes, dynamic transparent route calculation, and traffic prioritization for APPC traffic.
Advanced Program-to-Program Communication (APPC)
Advanced Program-to-Program Communication. IBM SNA system software that allows high-speed communication between programs on different computers in a distributed computing environment. APPC establishes and tears down connections between communicating programs.
High Performance Routing (HPR)
High Performance Routing (HPR) is an enhancement to APPN that improves network performance and reliability. Considered the next step in the evolution of SNA networking, HPR replaces the APPN routing technique called intermediate session routing (ISR) and provides significant performance improvements over ISR. HPR replaces ISR with two elements: Rapid Transport Protocol (RTP) and Automatic Network Routing.
Qualified Logical Link Control (QLLC)
Qualified Logical Link Control (QLLC) is an IBM-defined data-link-layer protocol that allows SNA data to be transported across X.25 networks.
Synchronous Data Link Control (SDLC)
IBM developed the Synchronous Data Link Control (SDLC) protocol in the mid-1970s for use in Systems Network Architecture (SNA) environments. SDLC was the first link-layer protocol based on synchronous, bit-oriented operation.
Advanced Peer-to-Peer Networking. Enhancement to the original IBM SNA architecture. APPN handles session establishment between peer nodes, dynamic transparent route calculation, and traffic prioritization for APPC traffic.
Advanced Program-to-Program Communication (APPC)
Advanced Program-to-Program Communication. IBM SNA system software that allows high-speed communication between programs on different computers in a distributed computing environment. APPC establishes and tears down connections between communicating programs.
High Performance Routing (HPR)
High Performance Routing (HPR) is an enhancement to APPN that improves network performance and reliability. Considered the next step in the evolution of SNA networking, HPR replaces the APPN routing technique called intermediate session routing (ISR) and provides significant performance improvements over ISR. HPR replaces ISR with two elements: Rapid Transport Protocol (RTP) and Automatic Network Routing.
Qualified Logical Link Control (QLLC)
Qualified Logical Link Control (QLLC) is an IBM-defined data-link-layer protocol that allows SNA data to be transported across X.25 networks.
Synchronous Data Link Control (SDLC)
IBM developed the Synchronous Data Link Control (SDLC) protocol in the mid-1970s for use in Systems Network Architecture (SNA) environments. SDLC was the first link-layer protocol based on synchronous, bit-oriented operation.
