Our own basic GeoDNS service, the Global Traffic Director
, splits up the globe into five regions, one of which is North America East. Each region has its own dedicated nameserver sets which host region-specific responses for each record.
Anytime a user in NAEast makes a query, they will be answered by a nameserver in NAEast with a record that was created specifically for NAEast. Simple, enough.
Now think of North America East. That’s everything from the Mississippi to the Atlantic Ocean. From Miami to the tip of Maine. That ’s hundreds of thousands of miles, millions of people that you’ve lumped into one group. It’s very unlikely that the response you chose for NAEast will actually deliver the best experience for all of your users
Instead, let’s use this kind of GeoDNS service as a fallback. If we can’t detect their actual location (using more advanced GeoDNS) then we will rely on a regional response.