cPanel DNS ONLY is application that allows you to run fully dedicated physical nameserver. WHM DNS Clustering feature can also useful to link your web servers to the DNS ONLY server.
stability is the main advantage to using DNS ONLY. If your web server has an outage, your DNS information stays accessible, even when your web server is offline. This allows visitors to reach websites on your server more quickly after the web server comes back online.
For this reason, using DNS ONLY is optimal for web hosts running multiple servers.
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