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

2. 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

3. 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

4. Capacity Planning
23 November 2018
Hamed Sadeghi Neshat

5. 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

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

8. 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

9. 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

10. 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

11. 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

12. 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

13. Content Distribution Network(cont.)
23 November 2018
References
Dinesh C. Verma, Content Distribution Networks: An Engineering Approach, Wiley . March 2003
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14. Question
23 November 2018
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15. 23 November 2018
Hamed Sadeghi Neshat

16. 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