Basic HTML version of Foils prepared Dec. 6 98

Foil 43 Legacy SNA (1)

From Introduction to Network Protocols Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 mainframe running Advanced Communication Facility/ Virtual Telecommunication Access Method (ACF/VTAM) servers as a hub of an SNA network; ACF/VTAM responsible for establishing sessions and distribution of recourses
2 SNA 7-layer model maps closely to OSI RM. The SNA and OSI layers are not identical and may not be inter-operable unless some form of gateway is provided.
  • Physical - SNA does not define this layer (runs over Ethernet, FDDI, FR, X.25)
  • Data Link Control - defines several IBM protocols including SDLC (Synchronous DLC), Token Ring Network, X.25
  • Path Control - performs routing, and segmentation and re-assembly (SAR)
  • Transmission Control - provides reliable end-to-end connection; encryption
  • Data Flow Control - manages request and response processing
  • Presentation services - coordinates resource sharing, converts data formats
  • Transaction services - provide application services (management and distributed processing)
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