NWS systems can also be arranged in a hierarchy: this may enhance the scalability of the Grid Connectivity Monitoring System.
The soundness of this hierarchical approach is evident as for Computing and Storage Services: one NWS system represents a site that offers such capabilities.
It is far less obvious, or even questionable, as for the representatin of Connectivity: e.g., what is the packet loss rate between A and B, when A and B belong to different subsystems?
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