If you have a popular Web site, then you’re going to need to deal with scaling issues.  And one of the things that most popular Web sites do to handle such scaling issues is to add a CDN, or “content distribution network,” which increases the perceived speed to end usersand reduces bandwidth needs on the server. If you’re Netflix, then these issues are crucial to your business. In this talk, Dave Temkin describes how he helped Netflix to build a CDN using open-source tools, what problems they encountered, and what we can learn from what they’ve done.