Will users authenticate to a different DC as soon as the current DC is removed

I need to DCpromo an old server and then remove it.  It is currently the DC users are authenticating to.  I just want to be sure before I remove it, that when they come to work they will get authenticated to the other DC already in place.
J.R. SitmanIT DirectorAsked:
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X-treemCommented:
yes, make sure roles are transferred and dns is ok as well as dhcp values
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motnahp00Commented:
Just make sure the clients have valid DNS settings for the other DCs and you should be good.
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awaggonerCommented:
You can confirm all the roles are transferred, then power off the old DC.  With the old DC powered down, try to authenticate/logon from a workstation.  Confirm you are not using cached credentials to logon.

If you can authenticate with the old DC powered down, then you should not have a problem after the DCPROMO.

You could even leave the old DC powered down for a day or two, just to be sure.

Also, will you have 2 DCs after removing the old server?
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AnuroopsunddCommented:
Yes, Machines request DNS for the valid DC's list ...
Even in normal scenario  if  one DC is down (Due to link issue or is getting rebooted) the and is not reachable then it connects to the 2nd available...

So ones you remove the DC from DNS it will straightly go to the Valid DC servers.
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J.R. SitmanIT DirectorAuthor Commented:
After I remove the old DC I'll be adding another one later that day, Why?
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awaggonerCommented:
Best practices recommend at least 2 domain controllers.
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J.R. SitmanIT DirectorAuthor Commented:
Ah, thanks
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J.R. SitmanIT DirectorAuthor Commented:
all answers were helpful and came in at about the same time, so I thought it fair to split points.

Thanks to all.
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