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Being a huge system, Internet topology structure is very complex. It can't be treated as a plane simply, and its hierarchy must be analyzed. The authors used the k-core decomposition to disentangle the hierarchical structure of Internet Router-Level Topology. By analyzing the router-lever Internet topology measuring data from CAIDA (The Cooperative Association for Internet Data Analysis),they studied the characteristics of the nodes in the inner hierarchy and outer hierarchy respectively. The frequency-degree power law of the nodes which coreness is lower and the regionally distribution of the nodes which coreness is higher were concluded. At last, the topology of every hierarchy was described by giving their figures. These descriptions can provide a valuable reference for modeling on the Internet topology.
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