A Walk through Content Delivery Networks

Abstract

Abstract. Content Delivery Networks (CDN) aim at overcoming the inherent limitations of the Internet. The main concept at the basis of this technology is the delivery at edge points of the network, in proximity to the request areas, to improve the user's perceived performance while limiting the costs. This paper focuses on the main research areas in the field of CDN, pointing out the motivations, and analyzing the existing strategies for replica placement and management, server measurement, best fit replica selection and request redirection.

Session based access control in geographically replicated Internet services

“…We refer to [2] for a short survey on this topic. We limit our discussion to the consideration that while in several commercial implementations of CDN, request redirection is performed at the DNS level, DNS authoritative servers are not the best place to enable access control policies and performance based request redirection, due to caching of address resolution.…”

“…See [2] for a survey on types of services typically supported by CDN and more generally by geographically distributed replicated architectures. The list include informational services and e-commerce services among the others.…”

Numerical analysis of content distribution method for Content Delivery Networks

“…As one of candidates for efficient delivery service, Content Delivery Network (CDN) [1,2] is provisioning in transport network as a new paradigm. CDN enables users to resolve the issues of distributive storage, load balancing, re-direction of network request and content management [3,4].…”

Using Hierarchical Scheme and Caching Techniques for Content Distribution Networks

“…It requires some important features: Replica placement mechanisms, Request Routing or Replica selection mechanisms [1,2] and Accounting or measurement mechanisms [4,5]. In this paper we mainly focus on replica placement mechanisms [3,4,7,10,11], the reader may refer to [8] for more complete surveys on Content Distribution Networks. Replica placement is about where and how the replica could be distributed across the Internet to minimize the user latency, the number of replica, and the bandwidth used for replica management.…”