When a T2.0 or T2.1 is connected directly to T4 node, the T4 node performs a boundary function. When interconnecting nodes in different subarea networks, the T4 node performs a gateway function.
In a subarea network, every T5 and T4 node is assigned a subarea number. The subarea number has to be unique in the SNA network.
Every T5 node in a subarea network contains a control point, which in general manages the network resources. Management activities include resource activation, deactivation, and status monitoring. APPN node also implement control point.
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