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In this paper, we investigate the evolution of the IPv4 and IPv6 Internet topologies at the autonomous system (AS) level over a long period of time. We provide abundant empirical evidence that there is a phase transition in the growth trend of the two networks. For the IPv4 network, the phase change occurred in 2001. Before then the network’s size grew exponentially, and thereafter it followed a linear...
The Internet topology at the autonomous systems (AS) level exhibits a complex structure. The positive-feedback preference (PFP) model was designed to capture two properties of the Internet, namely the degree distribution and the rich-club connectivity. It has been a pleasant surprise that the model also reproduces a large number of other properties of the Internet, including the degree correlation,...
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