Cpanel DNS Cluster Configuration - how it should be configured
If at all possible, you should link your web server directly to the DNS servers, you will need to sync each web server to its DNS servers.
Performance:
Creating a cluster setup with direct links between servers can decrease CPU load, improving the performance of your servers. The more steps, or “hops,” between a web server and a nameserver, the slower the servers’ performance will be.
You should not set a DNS server to sync data back to a web server, as this will put extraneous data on the web server.
For each intermediate server you add, the data transfer time is 3 times slower than for a direct link.
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