New answers tagged wordpress.com
CDN / front-end caching: all scripts and stylesheets are served from our CDN. Images are served from our dedicated *.files.wordpress.com domain. https://vip.wordpress.com/documentation/caching/ That page should answer your question regarding the WordPress.com CDN. cybmeta correctly stated that it is for VIP WordPress members only.
Photon is the part of jetpack that uploads your images to wordpress.com so they can be served from their CDN. You can turn it off here: yourdomain.com/wp-admin/admin.php?page=jetpack_modules&module_tag=Photos%20and%20Videos
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