How to allow only secure dynamic updates?

Submitted by: Administrator
1) Click Start, point to Programs, point to Administrative Tools, and then click DNS.
2) Under DNS, expand the applicable DNS server, expand Forward Lookup Zones (or Reverse Lookup Zones) , and then click the applicable zone.
3) On the Action menu, click Properties.
4) On the General tab, verify that the zone type is Active Directory-integrated.
5) In the Allow dynamic updates? box, click Only secure updates.
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