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mariusroma avatar image
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mariusroma asked DSPatrick answered

Preferred and Alternate DNS servers

On Windows 10 PCs (and in all Windows machines) I can configure a Preferred and an Alternate DNS.
What exactly are the conditions under which alternate DNS is queried?
Only if Preferred DNS is down?
Even if the Preferred DNS cannot resolve the domain name?
What are the exact conditions?
Regards
marius

windows-dhcp-dns
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CandyLuo-MSFT avatar image
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CandyLuo-MSFT answered

Hi,

If DNS client does not receive a response from primary DNS server, then it will send DNS query to secondary DNS server. A negative response, such as "name not found" is also considered a valid response.

The following articles can help you understand DNS query process, you could have a look:

DNS client resolver behavior

Best Regards,
Candy


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DSPatrick avatar image
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DSPatrick answered

If the primary fails to reply then the alternate would be used. If the primary returns a reply that cannot resolve the alternate is not used.

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DSPatrick avatar image
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DSPatrick answered

Any progress or updates?

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