Two clustering methods are described and applied to network data. These allow the clustering of machines into "activity groups", which consist of machines which tend to have similar activity profiels. In addition, these methods allow the user to determine whether current activity matches these profiles, and hence to determine when there is "abnormal" activity on the network. A method for visualizing the clusters is described, and the approaches are applied to a data set consisting of a months worth of data from 993 machines.
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