Which Domain Controller authenticates user???

This is just an information question.  I have 3 domain controllers in a Windows 2003 Native Server environment.  Two are local to virginia and one is via a WAN connection to Dallas.  My question is, how does the login pick the server to authenticate to, and run the login script from?  I noticed that most of my users are attaching to the WAN connected Dallas server when in fact, the other servers are much closer.  Do I need to worry about this?  Is this a role issue?  Is there a way to force it to use a server that is more local to our network????  

Thanks for your help.
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suzbaraAsked:
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Pete LongTechnical ConsultantCommented:
>> I noticed that most of my users are attaching to the WAN connected Dallas

go to active directory sites and services - create a new site called Dallas and put the dallas subnet in there - also ensure you have a global catalog server at YOUR location

PL

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suzbaraAuthor Commented:
that was easy!! Thanks a bunch.  (I wasn't the one that set up the Dallas server!!)

S
Pete LongTechnical ConsultantCommented:
:) No Probs  - Glad to help
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