Hi,
1>
Directly connected router.
2>
How to Configure Forwarders:
https://support.microsoft.com/en-us/help/323380/how-to-configure-dns-for-internet-access-in-windows-server-2003
3>
How to create and apply a custom application directory partition on an Active Directory integrated DNS zone in Windows Server 2003:
https://support.microsoft.com/en-ie/help/884116/how-to-create-and-apply-a-custom-application-directory-partition-on-an
Above are information and just for your reference. Based on your description, your question is mainly about Network & DNS, it is beyond the support scope on this forum, as we mainly discussing question about branch cache (a wide area network (WAN) bandwidth
optimization technology).
I would recommend you to post on
TechNet – Network Infrastructure Servers forum and relate product expert may provide you more information:
https://social.technet.microsoft.com/Forums/en-us/home?forum=winserverNIS&filter=alltypes&sort=lastpostdesc
Best Regards,
Eve Wang
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