Using Cloudinary, you can rest assured that your assets (images, videos, etc.) are delivered via CDN.
Cloudinary provides seamless integration with Akamai, Fastly, and Amazon CloudFront as the CDN layer and includes modules that analyze the CDN flow, logs, etc. for remote resource refreshing, performing tuning, and usage reporting.
Therefore, it is preferred to have a CDN distribution layer owned and managed by Cloudinary. However, you are able to use your own CDN layer.
Note that having your own CDN layer in front of Cloudinary is a feature reserved for premium plans. (If that something you are considering, please contact our support team at email@example.com).