Another new feature added to Windows 2003 DNS server is conditional forwarding. Conditional forwarding forwards DNS queries to the DNS name server specified in the query. Both stub zones and conditional forwarding provide the ability to control routing DNS traffic on your network. Windows 2000 Servers forward all requests to the same set of servers listed as forwarders. This can be inefficient because not all servers have information about the query. Conditional forwarding improves granularity with name-specific forwarding.
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