Limitations
Though it is standardized, full-zone transfer being described as one of the possible database replication mechanisms in RFC 1034 (incremental zone transfer described in RFC 1995), zone transfer is the most limited of those database replication mechanisms. Zone transfer operates in terms of "wire format" resource records, i.e. resource records as they are transferred using the DNS protocol. However, the schema of wire format resource records may not match the database schema used by the back ends of the DNS servers themselves.
Read more about this topic: DNS Zone Transfer
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—Raymond Chandler (1888–1959)