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In this paper we present a framework and a set of algorithms for determining faults in networks when large scale outages occur. The design principles of our algorithm, netCSI, are motivated by the fact that failures are geographically clustered in such cases. We address the challenge of determining faults with incomplete symptom information due to a limited number of reporting nodes in the network. netCSI consists of two parts: hypotheses generation algorithm, and ranking algorithm. Whendoi:10.1109/tdsc.2014.2369051 fatcat:427lcjjbtjb2nb4xfvubx5uaoq