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Many large-scale distributed systems can benefit from a service that allows them to select among alternative nodes based on their relative network positions. A variety of approaches propose new measurement infrastructures that attempt to scale this service to large numbers of nodes by reducing the amount of direct measurements to end hosts. In this paper, the authors introduce a new approach to relative network positioning that eliminates direct probing by leveraging pre-existing infrastructure. Specifically, they exploit the dynamic association of nodes with replica servers from large Content Distribution Networks (CDNs) to determine relative position information - they call this approach CDN-based Relative network Positioning (CRP).
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