If you purchased Website Security Advanced or Premium, the content delivery network (CDN) will be enabled automatically after the IP address change is complete. What is a CDN? A content delivery network (CDN) is a network of servers that deliver content. The purpose of the CDN is to cache and more quickly serve static content based on the geographical location between the origin server (the server your site is hosted on) and the user making the request. This means when someone in Japan visits your website hosted in the United States, it will load just as fast as a website hosted in Japan.