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SNA Terms and Concepts
Basic APPN ConceptsBasic APPN Concepts
Advanced
An APPN network is composed of type 2.1 nodes. Each node in the network is connected by a link to at least one other node in the APPN network.
APPN nodes can include processors of various sizes, such as the Application System/400 (AS/400), the Enterprise System/9221 (ES/9221) running under Distributed Processing Program Executive/370 (DPPX/370), systems using Virtual Terminal Access Method (VTAM), and
APPN provides the following functions:
•Support for APPN network nodes and end nodes as well as
•APPN control point functions (see “APPN Control Point”)
•Directory services to support finding specific logical units (see “Locating Resources”)
•Topology and routing services to support session establishment using intermediate session routing (ISR), automatic network routing (ANR), or connection networks (CNs) (see “Session Routing” and “APPN Connection Networks”)
An APPN node can also be connected to a subarea network, serving as both an APPN node in a peer network and a peripheral node in a subarea network.
APPN Node Types
The following types of nodes can be part of an APPN network:
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