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Best practice for Pri and Alt DNS settings for multiple site with ADI

Rick_Penney asked
Last Modified: 2015-11-02
Just wanted to know the best configuration for DNS Primary and Alternate  DNS settings in DCs in second/third logical site
Set up:
One local Domain, 3 physical sites, 2 Domain controllers in each site (All Domain controllers set as Global Catalogues, & DNS (Active Directory integrated zone))
Active Directory subnetted into 3 logical sites.

Site one:
Server 1      DNS Pri        Alt DNS
Server 2      DNS Pri       Alt DNS

Site two:
Server 1      DNS Pri  or       Alt DNS
Server 2      DNS Pri  or    Alt DNS

Site three:
Server 1      DNS Pri  or       Alt DNS      
Server 2      DNS Pri  or      Alt DNS

For site Two, Would I set the Pri DNS on the first domain controller to site Two's second domain controller, or would I set it to site one's first DC?
Same applies for site Three
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