slave dns server

Is there really a point of setting up a slave dns server when it will be on the same computer, only a different IP?? I dont see one. But domain registers need two servers. I tried entering the same one twice but it wouldnt let me. So what options available to me. Just set up two on the same computer to keep the registries happy? Is there any totally free dns name servers I could use as Im having trouble setting up the slave.

 

 

 

 

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