Akamai is the #1 CDN in the ecosystem, followed by EdgeCast and Limelight Networks, respectively. Akamai is the only CDN in the ecosystem that offers every type of CDN functionality, as displayed in the diagram below. EdgeCast is a close number 2 that lacks only a web application firewall before it catches up to Akamai on a feature set basis. In the diagram below, the middle circle represents a CDN that plays in every CDN niche whether its live streaming, security, mobile, or anything else. Limelight Networks is right behind EdgeCast, being the #3 CDN. If they make a play for Alert Logic, they will also move into the middle circle of the diagram. In fact, Limelight Networks will become the #2 CDN after Akamai, followed by EdgeCast. The diagram below illustrates the spot LLNW would occupy with the Alert Logic acquisition.
