Abstract: This paper selected Internet AS-level Skitter dataset from Jan, 2003 to Dec, 2007 and Ark dataset from Jan,2008 to Dec, 2008 authorized by CAIDA(The Cooperative Association for Internet Data Analysis) to analyze in-depth to explain the effect on the measurement results of the Internet topology by the changing of the measurement infrastructure. Research began with the detailed statistics of various characteristics of Internet AS-level topology. The similarities and differences in several characteristics of Internet AS-level topology under Skitter and Ark were analyzed. Then the power-law distribution and the evolution of connectivity and topology core of the network were analyzed. The results show that the power-law property and high clustering feature of Internet have not disappeared with the transition of infrastructure.

Key words: Complex network, Skitter, Ark, Power law, Connectivity, AS-level topology