The default setting appears to be Dynamically update DNS A and PTR records only if requested by the DHCP clients.
(This is under ) Is there a downside to selecting Always dynamically update DNS A and PTR records?
Since the DHCP server always assigns the dynamic IP addresses to the client computers which may change from time to time, and the DNS maintains the records of the information about the host names and their corresponding IP addresses, there must be some technology with the help of which the DNS server records can automatically get updated with the latest IP addresses that the DHCP server has assigned to the DHCP clients.
In additon, hosts can change the records and then become the owner of the record.
I've got a Windows 2012 Domain Controller running DNS and DHCP servers.
In addition, Secure Dynamic Update can be required for zones that are Active Directory-integrated (and should be required, per best practices), which allows only members of the Authenticated Users group to register records.
Those records have an ACL on them to stop registered records from being hijacked by other hosts.
Here is how you can enable the DNS integration with the Windows Server 2012 DHCP server: Once done, click OK to save the changes that you have made.