[uncertainrhymes]

If you use a CDN to front your traffic, you need the CNAME for www (or whatever) to be pointing at their DNS infrastructure, so they can return whichever closest POP is going to serve your traffic.

e.g. dig @1.1.1.1 www.nvidia.com +trace

... various things from the root ...

www.nvidia.com. 7200 IN CNAME www.nvidia.com.edgekey.net. ;; Received 83 bytes from 208.94.148.13#53(ns5.dnsmadeeasy.com) in 35 ms

So the main DNS is fine, but it'll never get an A record because the last link in the chain is toast -- edgekey being Akamai in this case, but all CDNs do this so they can route traffic. Normally, this is a good thing so they can shift traffic within 30 seconds on their side. Unfortunately, it also means it would take nvidia an two hours to point away from Akamai.