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Event ID: 5784 Source: Netlogon

Source
Level
Description
Site "<site name 1>" does not have any Domain Controllers for domain "<domain name>". Domain Controllers in site "<site name 2>" have been automatically selected to cover site "<site name 1>" based on configured Directory Server replication costs.
Comments
 
This is stating that their are no domain controllers for the domain <domain name> in the Site "<site 1">, but the site "<site 2>" does have domain controllers from the <domain name> domain so it will take care of queries of the <domain name> domain for the "<site 1>" site.
As per ME259435, this is expected behavior and allows domain controllers from other sites to function as domain controllers for your newly created site, based on the most efficient cost figure.

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