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Windows Server 2012 -- domain controller FAILOVER ?

My two 50-user locations are connected via
20MB fiber and each has ONE domain controller.

How can I setup so if an ON-SITE domain controller
is down it uses the REMOTE domain controller instead
or do I need two domain controllers at each location ?
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finance_teacher

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Currently each domain controller (one at each site)
also does DNS for the 50 users at each site.

Site #1 Example, 192.168.1.1
    ** Primary DNS Server = Site #1, 192.168.1.1
    ** Secondary DNS Server = Site #2, 192.168.2.1
----------------------------------------------------------------------------------------------------------------
What do you recommend since it seems like the below happens ?

  ** login to a computer @ site #1 using a NEW, non-cached account
  ** see that above Primary DNS Server & Secondary DNS Server are correct
  ** turn off Primary DNS Server
  ** login to a NEW computer @ site #1 using a NEW, non-cached account
  ** login as the CACHED user instead
  ** do PING
            ** 192.168.1.1 is down
            ** 192.168.2.1 is up

I was assuming login to a NEW computer @ site #1 using a NEW,
non-cached account would work since the backup, 192.168.2.1, is up
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