http://www.telegeography.com/products/map_internet/index.php

http://www.technologyreview.com/Infotech/18944/?a=f

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By Duncan Graham-Rowe

Tuesday, June 19, 2007

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Routing traffic through peer-to-peer networks could stave off Internet congestion, according to a new study.

Tangled web: The image above shows the hierarchical structure of the Internet, based on the connections between individual nodes (such as service providers). Three distinct regions are apparent: an inner core of highly connected nodes, an outer periphery of isolated networks, and a mantle-like mass of peer-connected nodes. The bigger the node, the more connections it has. Those nodes that are closest to the center are connected to more well-connected nodes than are those on the periphery.
Credit: Lanet-vi program of I. Alvarez-Hamelin et al.