Content Distribution Networks (CDNs) 23 November 2018 Content Distribution Networks (CDNs) . Hamed Sadeghi Neshat CMPT 771 - Presentation Hamed Sadeghi Neshat

Contents Introduction What are the other techniques? CDN Solution 23 November 2018 Introduction What are the other techniques? CDN Solution Effectiveness of CDN Various components of CDNs CDNs application . Hamed Sadeghi Neshat

Introduction Internet has been grown Users expect good response time 23 November 2018 Internet has been grown Users expect good response time Congesting problem What is the solution? Capacity planning Quality of Service Content Distribution Network . Hamed Sadeghi Neshat

Capacity Planning 23 November 2018 . Hamed Sadeghi Neshat

Quality Of Service (QoS) 23 November 2018 Reservation Approach applications inform the network about the amount of resources they need for adequate performance within the network. Class Differentiation Approach This scheme classifies all the packets entering into the network into two or more classes of service. . Hamed Sadeghi Neshat

Content Distribution Network 23 November 2018 Overview . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 Effectiveness of CDN How much a surrogate satisfy clients Hit ratio from surrogate Traffic flow between original server and surrogates Static data Dynamic data . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 The Component of CDN: Scalable site design Different sites should be designed for scalability. Large number of sites or small number of sites Routing technique Route the clients/users of an application to one of surrogate sites Network performance estimation Routing to nearest surrogate site Managing cache coherency and consistency The network infrastructure . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 Drawbacks Manageability issues Designing with strong emphasis on the manageability Some application should be redesigned Reverse surrogate server . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 Application Suitable for a CDN: Web application browsing, retrieval large static files Web-based shopping stores - advertisement Traditional Internet-based services File transfer Directory services . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 Application Unsuitable for a CDN: application involved a lot of updates Single chat room applications that need concurrent access from multiple locations Applications that have strong security We can use combination of CDN and single server Like Online Shopping . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 References Dinesh C. Verma, Content Distribution Networks: An Engineering Approach, Wiley . March 2003 . Hamed Sadeghi Neshat

Question 23 November 2018 . Hamed Sadeghi Neshat

23 November 2018 . Hamed Sadeghi Neshat

Content Distribution Network(cont.) 23 November 2018 Environments for CDN CDNs for an enterprise CDNs for an ISP Environment Content Distribution Network Service Providers . Hamed Sadeghi Neshat