When a DNS server running on Windows Server 2008 receives a query for a single-label host name, it attempts to resolve the name by first checking for the name in the GNZ. If it is not able to resolve the name by using the GNZ, , it then looks in local zone resource records. Only if the GNZ and local query fails does the DNS server fail over the query to WINS, if the zone is configured to use WINS lookup. On the other hand, when a DNS server running on Windows Server 2008 receives a dynamic update request for a new host, it first checks for the name in GNZ and, if it finds the host name there, it refuses the update request to ensure that the names in the GNZ remain unique throughout the forest or forests where the GNZ is deployed.
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https://technet.microsoft.com/en-us/library/cc816610(v=ws.10).aspx
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