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72 startup effects by limiting our analysis to the recent history. This is similar to previous studies [25,114]. In particular, we only consider links created between January 1st, 2005 and April 6th, 2007, a period of 826 days. During this period, we observed over 1.1 million new pages and over 33 million new links, representing 169% growth in the number of pages and 500% growth in the number of links relative to the snapshot on January 1st, 2005. 4.4.4 Internet topology The Internet can be viewed as a collection of autonomous systems (AS), where each AS represents a single administrative domain (typically, an ISP). The inter-domain routing protocol of the Internet, BGP, uses unique AS numbers to allow ASes to advertise their connections to their neighbors. The union of these advertisements forms an undirected graph representing the AS-level connectivity of the Internet. We used the AS topology graphs collected by CAIDA [24] to study the evolution of the AS network. CAIDA creates weekly (monthly for the first two years) snapshots of the AS topology using a number of BGP monitoring machines. We downloaded the entire history of their measurements, which covers the period from January 5th, 2004 until July 9th, 2007. The AS topology evolution data therefore covers 1,282 days of growth. During this period, the number of ASes in the network grew from 9,978 to 25,526, a growth of 155%. Similarly, the number of AS links grew from 29,504 to 104,824, a growth of 255%.PDF Image | Online Social Networks: Measurement, Analysis, and Applications to Distributed Information Systems
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