You anycast the dns servers and anycast the results the dns servers serve up. This is kinda confusing, but all it is really is announcing your (same) IP block a

You anycast the dns servers and anycast the results the dns servers serve up. This is kinda confusing, but all it is really is announcing your (same) IP block at every datacenter and relying (maybe selling/) on bgp AS path selection as the app to get traffic to the closest datacenter.