Research on content delivery networks

CDN (Content Delivery Network) is a novel overlay network, which deploys surrogates on the edge or backbone of network in order to reduce the access delay; it improves the efficiency of content delivery on the global load balance component. In current status, CDN has been a core Internet application as the development of multimedia and network technologies. In this paper, the evolution of CDN and its architecture are introduced; the key component of CDN and mechanism are presented; the taxonomy of CDNs and the performance measured strategies are reviewed. The developing trends of CDN and further topics in this area are also analyzed.