How do I configure DHCP for dynamic updates in Windows Server 2008?

Configuring the Scope properties

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The default is for a DHCP client to update A (host name) records and have the DHCP server update the PTR records. If you select the Always dynamically Update DNS A and PTR records option, as we have done, the DHCP server updates all A and PTR records. If you select the Discard A and PTR records when lease is deleted check box, when any client lease expires, the DNS entries expire and will be removed. Deselecting the box simply leaves your lookups there.

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