Active Directory Design Help Required

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HI,

 

We have got a new project details as follows

 

1) Two domain Controllers at site1

 

DC's

 

DS1.int

DS1-1.int

 

2)One domain Controller at site2

 

DC

 

DS2.int

 

Both sites are going to use different DNS server settings

 

Need to Acheive the following

 

Site2 Users need to access some of the resources (Files,folders) in one of

the domain controller in Site1

 

Howto Proceed with this?.Can some one explain step by step procedure

 

Thanks for your kind help