This area of WHM allows you to configure a number of servers to share DNS information, and to create a trust key relationship between those servers.
Configure Cluster — A DNS cluster consists of a number of nameservers that share records. This allows you to physically separate your nameservers so that in the event of, for instance, a power outage, you still have DNS functionality. This way, visitors can reach websites on your server more quickly after the web server comes back online.
Setup Remote Access Key — This feature can be used to generate an access key. This access key can be used for automatic account creation scripts, external billing software, and allowing servers in your DNS cluster to exchange records.