Domain Name Service (DNS) is a critical component of every organization’s Web infrastructure. DNS translates human-readable domain names into numerical IP addresses, enabling users to connect with Web sites and applications. Despite its mission-critical nature, many organizations underdeploy their DNS infrastructure and often depend on just two or three DNS servers to support their global operations. This leaves their DNS deployment – and their entire Web infrastructure – increasingly vulnerable to data center outages as well as a new breed of DNS-based distributed denial of service (DDoS) attacks..