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Content delivery network report
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CONTENT DELIVERY NETWORKPEERING CDN DIMPLE BADIANI 008081710
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ABSTRACT: The proliferation of Content Delivery Networks (CDN) reveals that existing content networks are owned and operated by individual companies. As a consequence, closed delivery networks are evolved which do not cooperate with other CDNs and in practice, islands of CDNs are formed. Moreover, the logical separation between contents and services in this context results in two content networking domains. But present trends in content networks and content networking capabilities give rise to the interest in interconnecting content networks. Finding ways for distinct content networks to coordinate and cooperate with other content networks is necessary for better overall service. In addition to that, meeting the QoS requirements of users according to the negotiated Service Level Agreements between the user and the content network is a burning issue in this perspective. This paper presents a scalable and ServiceOriented Architecture based system to assist the creation of open Content and Service Delivery Networks (CSDN). It deals with peering of CDN and why is it necessary. The open CSDNs scale and support sharing of resources through peering with other CSDNs[1]. INTRODUCTION: What is Content Delivery Network(CDN) ? A content delivery network or content distribution network (CDN) is a large distributed system of servers deployed in multiple data centers in the Internet. Content delivery networks (CDNs) help content providers deliver text, pictures, audio, video,
3.
applications and services to users. The purpose of CDNs is to overcome the limitations of the Internet in terms of user perceived Quality of Service (QoS) when accessing content. A CDN replicates content from the origin server to cache servers called replica servers, spread across the globe. Content requests are directed to the cache server closest to the user, and that server delivers the requested content. A CDN has a combination of a content delivery infrastructure, requestrouting infrastructure, distribution infrastructure and an accounting infrastructure. CDNs improve network performance by maximizing bandwidth, improving accessibility and maintaining correctness through content replication. As a result, CDNs offer fast and reliable applications and services by distributing content to cache servers located close to endusers. CDN providers ensure the fast delivery of any digital content. They host a thirdparty content like images, software patches, streaming media and file transfer service. The source of content are web service providers or media companies, whereas, the end users interact with the CDN through cell phone, PDA or laptop. Why Peering of CDNs? Presently the CDNs are owned and operated by individual companies, who have created their own closed delivery network which is somewhat expensive to maintain. Even though there are many CDN providers, they do not specifically cooperate in delivering content to endusers in a scalable manner. So one have to utilize the service of a CDN provider at a time, one cannot use multiple CDNs offering different services together. As a result use of one specific CDN creates isolation of CDNs and it increases the cost for the company using it. To minimize the cost CDN providers must collaborate with each other so that services can be supplied and received in a cooperative manner which cannot be provided by the other CDN providers and vice versa. Through collaboration with another CDN provider, content networks can emphasize on customer satisfaction meeting enduser’s QoS requirements, and hence
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it can minimize the exposed business impact of service level violations. To make content services an Internet infrastructure service, vendors have implemented content service networks, which act as another network infrastructure layer built upon CDNs and provide next generation of CDN services. CSN appears to be another variation of the conventional CDN as it is just another layer of network infrastructure built around CDN. This logical separation between content and services under the Content Delivery/Distribution and Content Services domain, is undesirable considering the ongoing trend in content networking. Hence, a unified content network which supports the coordinated composition and delivery of content and services, is highly desirable. This paper presents the idea of creation of open Content and Service Delivery Networks(CSDNs). The CSDNs scale and support sharing of resources through peering with other CSDNs. A virtual organization model for CSDN supports sharing of web servers within their own networks as well as other CSDN. It also defines the key areas related to CSDN by identifying issues to be addressed. STATE OF ART: In content delivery network, end user requests are served from the web servers distributed around the internet that cache the original content stored in the origin server. CDNs are dedicated to web caching content for the users to access it faster; whereas, peer2peer sharing networks are integrated vertically to achieve a single goal, and execute the data intensive applications on remote data. Some of the representatives of CDN are described below. Limelight Networks: It is a content delivery network service provider. The advanced content delivery network provides high performance delivery of digital media and software. It supports distributed ondemand and live delivery of video, music and games[2]. Mirror Image: It is a global network for online content, application and transaction
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delivery, provides content delivery, streaming media, web computing and reporting solutions that offer customers a way to create web experiences for users[3]. Ignite Technologies: It provides the leading enterprise content delivery solution, enabling businesses to efficiently publish, deliver and manage digital assets from rich media content for training and communications, to software patches and virus updates to anyone at any time[4]. Issues involved in CDN: As CDNs spread over various geographical locations and uses distributed components, there are various technical issues concerned with CDN content delivery. Some of them are as follows: CDN selection: The choice of content to be delivered to the end user is of utmost important. Content can be delivered in full or partial, to the customers. In full content delivery, the servers perform entire replication in order to deliver total content to the end user. Whereas, in partial delivery, only embedded objects are delivered. Request Routing: To select most appropriate server for content routing, several routing schemes can be used. Some of them are CDN peering, URL rewriting , client multiplexing[5]. In CDN peer approach, peertopeer content networks are formed by symmetrical connections between host computers. When CDNs are peered, they deliver content on behalf of each other. Content Replication and Caching: Replicating of the content is very common in large scale distributed environment of CDN. Caching can be done on intracluster or intercluster basis. Content outsourcing: After selecting the proper servers for CDN infrastructure and
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proper content selection, it is necessary to decide which method to follow for content outsourcing. The various types of content outsourcing methods are cooperative pushbased, non cooperative pullbased and cooperative pullbased. REFERENCES: en.wikipedia.org/wiki/Content_delivery_network Limelight networks www.limelight.com Mirror Image www.mirrorimage.com/site Ignite Technologies www.ignitetech.com/platform.aspx G. Peng, CDN: Content Distribution Network, Technical Report.
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