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CDN is being used for caching static elements (such as images, js, css files, fonts, etc) and elements that can be equated to static (dynamically generated pages with content that is the same for all visitors that can be cached).
When accessing the System Domain, the objects are imported from the Origin Server and cached (either given without caching if it is not cached, for example, a dynamically generated page, the content of which is different depending on the user who views the page).
Importing files from the Origin Server is performed by the node which is the closest to the Origin Server, other nodes receive files from the Import node (when the Origin Shield option is on).