Global Catalog on domain

Dear All,
I am dian, and I have a question about Active Directory.
In my company we implement active directory. We have many active
directory sites but we only create a domain, which is:
xx.yyyyyy.com

currently in my sites, we do not have a DC ( domain controller)
installed. So every user has to authenticate to AD controller in
regional office in another country. As my file server is in my place,
sometime when internet connection goes down, my users can not access
the file in my local server. Because, we fail to authenticate to AD
controller as the internet goes down.
I want to set up the AD controller in my site, but the problem is I
only have limited bandwidth, I am not so sure that the bandwidth is
enough for replication process. My question are:
1. If I install AD controller on windows server 2003, should I enable
Global Catalog? Can I just install AD controller without enable global
catalog? As I know there is Global Catalog - less logon process.
Please correct me if I am wrong.

2. If our Active Directory domain is created under Windows 2000
server. Should I install global catalog on my domain controller.

3. How big the size of file that need to be replicate in the
replication process?


4. Should all domain controller enable GC (global catalog), if the
domain is created in windows server 2003 or windows server 2000?

Please anyone help me, your help will be much appreciated.
Thanks in advance

Best Regards
.

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