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Content distribution networks (CDNs)

The content providers are the CDN customers. Content replication CDN company installs hundreds of CDN servers throughout Internet in lower-tier ISPs, close to users CDN replicates its customers’ content in CDN servers. When provider updates content, CDN updates servers.

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Content distribution networks (CDNs)

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  1. The content providers are the CDN customers. Content replication CDN company installs hundreds of CDN servers throughout Internet in lower-tier ISPs, close to users CDN replicates its customers’ content in CDN servers. When provider updates content, CDN updates servers Content distribution networks (CDNs) origin server in North America CDN distribution node CDN server in S. America CDN server in Asia CDN server in Europe

  2. origin server www.foo.com distributes HTML Replaces: http://www.foo.com/sports.ruth.gif with http://www.cdn.com/www.foo.com/sports/ruth.gif HTTP request for www.foo.com/sports/sports.html Origin server 1 DNS query for www.cdn.com 2 CDNs authoritative DNS server 3 HTTP request for www.cdn.com/www.foo.com/sports/ruth.gif Nearby CDN server CDN example CDN company • cdn.com • distributes gif files • uses its authoritative DNS server to route redirect requests

  3. routing requests CDN creates a “map”, indicating distances from leaf ISPs and CDN nodes when query arrives at authoritative DNS server: server determines ISP from which query originates uses “map” to determine best CDN server not just Web pages streaming stored audio/video streaming real-time audio/video CDN nodes create application-layer overlay network More about CDNs

  4. Content Distribution Networks • Example: AOL live 8 concert broadcast over the Internet, July 2, 2005 • 1500 servers distributed around the world • 175000 peak users • 50 Gbps aggregate bandwidth

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