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The Internet host cardinality, defined as the number of distinct peers that an Internet host communicates with, is an important metric for profiling Internet hosts. Some example applications include behavior based network intrusion detection, p2p hosts identification, and server identification. However, due to the tremendous number of hosts in the Internet and high speed links, tracking the exact cardinality of each host is not feasible due to the limited memory and computation resource. Existing approaches on host cardinality counting have primarily focused on hosts of extremely high cardinalities.
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