I have several questions about CDN. Is there a site recommended for this?
I know the Networking Engineering site is about network technologies, but the CDN is about an application layer network.
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managing the hardware or software of servers, workstations, storage or networks
If your question is "which open source CDN do you recommend" that's not going to fly (sites generally don't do recommendations) but if you have a CDN and need to configure it then Server Fault would seem to be the place.