Content Delivery Networks
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The document discusses content delivery networks (CDNs) and their components and functions. It begins with an introduction to CDNs, noting their goal of maximizing bandwidth by caching content at various network points near clients. It then discusses CDN architecture, components including delivery, storage, origin and control nodes, and functions such as caching, management/control, publishing/storage, and content delivery. Finally, it briefly mentions how CDNs could be applied to future telecommunication systems.
Content Delivery Networks
- 1. Content Delivery Networks Network and Telecommunications Perspective of View Electrical Engineering Department Telecommunications System Department Cognitive Radio Laboratory Shahid Beheshti University Instructor : M. Naslcheraghi Advisor : Dr. Ghorashi Advanced Computer Networks Lecturer : Dr. Abbaspour December, 2015
- 2. 1 2 3 4 Contents CDN Architecture Web Performance Today CDN Components CDN Functions and Processes 5 CDN on Future Telecommunication Systems
- 3. Introduction A content delivery network or content distribution network(CDN) is a system of caches containing copies of data, placed at various points in a network so as to maximize bandwidth for access to the data from clients throughout the network. Main Goal: A client accesses a copy of the data near to the client, as opposed to all clients accessing the same central server, so as to avoid bottlenecks near that server. Content types include web objects, downloadable objects (media files, software, and documents), applications and real time media streams. Why we need CDNs? What does CDNs stand for?
- 4. 3 GHZ 300 MHZ Ultrahigh frequency band Sweet Spectrum! 3 GHZ 300 MHZ This industry is on-legs for 4 decades
- 5. Statistical analysis reported by CISCO and Ericsson *10 ?x 1 TB for each user per year! 3 GHZ 300 MHZ 3 GHZ 300 MHZ What can we do to avoid Delay, Congestion, Saturation, Data Spot,… etc?
- 6. Most important attempts to avoid saturation and latency in cellular communications • Cooperative Networks • D2D Communications • Cells Compression • CDNs
- 8. Web Performance Today Key Questions • What performance problem does a CDN solve? • Does CDN performance vary, even with the same CDN? • Are CDNs effective for mobile users? • Does using a CDN guarantee 100% availability for my site? • Do most leading sites use a CDN? • Can CDNs use SPDY? • How competitive is the CDN market today? • How do I choose the right CDN for my site/business? • How do CDNs and front-end optimization compare when it comes to delivering faster pages?
- 11. CDN Components Principle Components Storage Nodes Control Node Delivery Nodes Origin Nodes
- 12. CDN Components Delivery Nodes– primary purpose is delivery of data to consumers. It contains caches each running one or more delivery applications; these tend to be deployed as close to the edge (near the consumers) as possible. Storage Nodes – primary purpose is providing data to caches, these can be deployed in a hierarchical model to allow tiered caching and protection to any origin servers. These nodes can also be used where pre-publishing of content is required rather than content being acquired on demand from origin servers. Origin Nodes – these are the master sources for content and can be deployed within the operator’s network (on-net) or more commonly within a content owner’s infrastructure. A number of origins will be provided for scale and resilience. Control Node – primary purpose is to host the management, routing and monitoring components of a CDN. This will be typically the integration point into any OSS/BSS systems and Network Operations Centres.
- 13. CDN Components
- 14. CDN Functions and Processes Principle Components Caching Management & Control Publishing/storage Delivery on-net management of content and publishing processes. the replication of content within the CDN the physical delivery of content to subscriber devices. Management, monitoring and control of the CDN
- 15. CDN Functions and Processes
- 16. CDN Functions and Processes
- 17. CDN on Future Telecommunication Systems “Telecommunications Perspective of View”
- 18. One-Cell System Model 12 / 21
- 19. Thank You for Your Attention