AEM as Cloud Service is shipped with a built-in CDN. It’s main purpose is to reduce latency by delivering cacheable content from the CDN nodes at the edge, near the browser. It is fully managed and configured for optimal performance of AEM applications.
The AEM managed CDN will satisfy most customer's performance and security requirements. Customers can optionally point to it from their own CDN, which they will need to manage. This will be allowed on a case-by-case basis, based on meeting certain pre-requisites including, but not limited to, the customer having a legacy integration with their CDN vendor that is difficult to abandon.