A few studies have investigated CDNs in the recent past. Peng [19] presents an overview of CDNs. Hiswork presents the critical issues involved in designing and implementing an effective CDN, and surveys theapproaches proposed in literature to address these problems. Vakali et al. [16] present a survey of CDNarchitecture and popular CDN service providers. The survey is focused on understanding the CDN frameworkand its usefulness. They identify the characteristics and current practices in the content networking domain, andpresent an evolutionary pathway for CDNs, in order to exploit the current content networking trends. Dilley etal. [2] provide an insight into the overall system architecture of the leading CDN, Akamai [2][3]. They providean overview of the existing content delivery approaches and describe the Akamai network infrastructure and itsoperations in detail. They also point out the technical challenges that are to be faced while constructing a globalCDN like Akamai. Saroiu et al. [48] examine content delivery from the point of view of four content deliverysystems: HTTP web traffic, the Akamai CDN, Gnutella [93][94] and KaZaa [95][96] peer-to-peer file sharingsystems. They also present significant implications for large organizations, service providers, networkinfrastructure providers, and general content delivery providers. Kung et al. [47] describe a taxonomy forcontent networks and introduce a new class of content network that perform “semantic aggregation and contentsensitiveplacement” of content. They classify content networks based on their attributes in two dimensions:content aggregation and content placement. As none of these works has categorized CDNs, in this work wefocus on developing a taxonomy and presenting a detailed survey of CDNs.
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