Loss of a DNS Server
Losing a DNS server impacts Active Directory in several ways. First and foremost, a domain controller must be able to resolve host names and service locator (SRV) records to communicate and replicate with its fellow domain controllers. If the DNS server used by a domain controller fails, the domain controller cannot maintain full functionality for long.
You should design your DNS infrastructure so that the loss of a single DNS server does not result in a service interruption. You should always have at least two DNS servers that are authoritative for a zone, and your clients should point at both servers, one as a primary and one as a secondary. A Windows client falls back on its secondary DNS server when it gets no response ...
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