need help : setting up nameserver using two seperate servers' IP

I found many threads about setting up nameserver under one box.
Is that possible to have nameserver using two seperate servers' IPs?
For example,
1) ensim box. IP - 12.34.56.78. domain - abc.com
2) plesk box. IP - 78.56.34.21. domain - xyz.com
I want to setup nameserver for these two boxes using their primary IPs for the purpose of redundancy. These two servers are located at different location.
Does anyone know how to do it or tell me where I can find info?

 

 

 

 

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