Evolution of the Internet and its measures

The Internet has being growing rapidly with the development of technique. Understanding the evolution of Internet is essential to the Internet security. there has been some studies on the evolution of Internet, which only analyze the change of the Internet during a quiet short period. In this paper, we have roughly analyzed the evolution of the Internet for last 20 years and take days as the granularity of time. Some important measures, such as average-distance and average-node-degree, have been analyzed. Our findings show that the growth of Internet is nearly binomial and the evolution of Internet can be divided into 3 different phases. Moreover, these findings can be used to model the evolution of Internet which would help us to better protect network security.