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(Globally, DNS doesn't care; as far as the actual name resolution goes, slave servers are as good as primary master servers.) What's the difference between a primary master name server and a slave name server?
The crucial difference is where the server gets its data.
The big advantage of slave name servers is that you maintain only one set of zone data files for a zone, the ones on the primary master name server.
You don't have to worry about synchronizing the files among name servers; the slaves do that for you.
A primary master name server reads its data from zone data files.