DNS Server option in DHCP

In the DHCP scope options 006 DNS Servers.  
Is it required to put all AD DNS servers there?  I got two in this case.
Also, is it a good idea to put google dns as 3rd option ?
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Is it required to put all AD DNS servers there?  I got two in this case.
Basically as many as you want. Should be at least two.
Also, is it a good idea to put google dns as 3rd option ?
No. No. No. No.
That probably can't be repeated often enough.
Your domain members need to use domain DNS servers exclusively. Google (or your ISP, or any other internet DNS service) knows exactly nothing about your AD domain, so how would the clients be supposed to find their DCs in a query sent to Google?

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Tiras25Author Commented:
Got it.  I know lots of people do that in case their local DNS tanks.

Also the sucky thing the device needs to be rebooted in order to change that dns scope option.
Cliff GaliherCommented:
Mostly already answered. I recommend putting two AD DNS servers in a DHCP scope when possible. Local and nearest remote neighbor.

And absolutely no external DNS servers.  your question specifically mentioned AD DNS  so the use of AD can be assumed thus the answer given.
Tiras25Author Commented:
Absolutely.  Thank you!
nociSoftware EngineerCommented:
If  all your local DNS server fall over, you are screwed anyway..., as all knowledge about your local domain is lost......
And the internet at large known nothing about your internal organisation (i hope...._).
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Windows Server 2012

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