Admin-Ahead's gDNS promises empowerment of new possibilities in the DNS Clustering environment. A first of its kind and the only one of its kind, Admin-Ahead gDNS enables, cross control panel and cross platform (clustering Linux and Windows servers) clustering while smoothly integrating the power of DNSSEC security into the mix. Though many were introduced to gDNS as the very first stand-alone DNS clustering solution for Plesk, gDNS 2.0.0 is the very first cross platform, cross control panel solution with the added option for users to add failover controllers, that helps ensure added efficiency. With 4 different editions, gDNS lets you choose the right solution you need,
gDNS Controller Server
This is the centralized server that receives DNS records from your cPanel and Plesk servers and pushes DNS records to additional common DNS servers you may be using for all the domains hosted in your network.
gDNS Transfer Cluster
The Transfer Cluster consists of DNS servers pushing zone records to the controller. These can be cPanel or Plesk (Linux) servers.
gDNS Edge Cluster
The Edge Cluster consists of DNS servers to which the Controller Server pushes zone records.
Link: Knowledge Base