2nd DC in active Directory

We have deployed a second DC in a remote office connected by a 10mb TLS. My question is if the primary DC went down at HQ would HQ users still be able to authenticate using the 2nd DC in the remote office? If not what needs to be done so they can?
sgt-exchangeAsked:
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KCTSConnect With a Mentor Commented:
If your current DC also provides DNS then you will need to make sure that all clients have the second DC set as their alternate DNS server. You will also need to make sure that the second DC is a Global Catalog as this is required.

http://support.microsoft.com/kb/313994
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pHppConnect With a Mentor Commented:
If all networks are ok and you don't have any errors between the two sites (eg. no replication problems etc.) that should work.
Normally you also use cached credentials on your computers so that users can login on their computers anyway.
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almilyoConnect With a Mentor Commented:
If TLS is set up correctly (I'm guessing you don't mean transport layer security!) then as far as your users machines are concerned, the remote DC should appear as if it were on the same physical network, and it is just a case of setting them up properly.

It's definitely a scenario you need  to test for out of hours though.
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sgt-exchangeAuthor Commented:
Thanks for the quick response on this. I just want to make sure that my thought process was correct. We will defiantly test this in the near future to ensure we set it up correctly. Any small little details you can think of that Microsoft fails to mention would be helpful as well
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