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In this paper, the authors study the structural evolution of the AS topology as inferred from two different datasets over a period of seven years. They use a variety of topological metrics to analyze the structural differences revealed in the AS topologies inferred from the two different datasets. In particular, to focus on the evolution of the relationship between the core and the periphery, they make use of a recently introduced topological metric, the weighted spectral distribution. They find that the trace-route dataset has increasing difficulty in sampling the periphery of the AS topology, largely due to limitations inherent to active probing.
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