The Impact of DNS on AD DS
Problems with DNS can spell disaster for an Active Directory environment. Because all servers and clients are constantly performing lookups on one another, a break in name-resolution service can severely affect Active Directory functionality.
For this and other reasons, installing a redundant DNS infrastructure in any AD DS implementation is strongly recommended. Even smaller environments should consider duplication of the primary DNS zone, and nearly as much emphasis as is put into protecting the Global Catalog AD index should be put into protecting DNS.
Security considerations for the DNS database should not be taken for granted. Secure updates to AD-integrated zones are highly recommended, and keeping DHCP servers ...
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