This document is aimed at those interested in building a content delivery network to enable the distribution and delivery of rich media over wide area networks, such as the Internet or corporate WANs. It considers a specific large event—the streaming of a U2 concert across Europe. After studying this document, the reader should: (i) Recognize the challenges associated with large-scale content distribution (ii) Realise the inherent benefits in caching and edge delivery of content (iii) Understand how to construct such a network to solve their own business needs