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RICEric22

It was mentioned in lecture that things stored in a CDN are not only expensive to serve, but also tend to not change. This is important because updating changes to something on the CDN requires quite a bit of time to propagate to every local CDN server, anywhere from 60 minutes to hours. So, for content that changes often, CDNs are not the greatest idea.

asinha

It was also mentioned in lecture that Akamai and other companies like it specialize in content delivery so that smaller companies who can't afford to create their own CDN can share with other companies. Therefore, ec2 cloud computing is to servers what akamai is to CDN's, so that smaller companies and startups can scale their product quickly and affordably depending on their load.

Dave

Akamai's biggest customer is Apple. If you're in Pittsburgh browsing iTunes, all the search and navigation requests you make are probably being serviced by Apple's North Carolina datacenter. But when you hit "Buy Song" the content is probably downloaded from an Akamai CDN node less than 50 miles away.