f65a352c_Part_1__Overview___ddiguru_com__Description
[Benefit] Enhanced Security [Description] 
Geographically dispersed DNS servers that operate using the same IP address makes the DNS service more resilient to DoS and/or DDoS attacks because its much tougher to launch attacks on hosts that use duplicated IP address schemes that reside in different parts of the network.
Anycast DNS - Part 1, Overview - ddiguru.com
Description