Hello.  I'm trying to plan a domain for a company with 1 Headquarters and 2 branch offices.<o:p></o:p>

Currently both branch offices are communicating with headquarters via site-to-site VPN.  However, most if not all of our services are cloud based.  The routers in each location are performing DHCP and DNS.  The speed at each location is good, 10 mbps at the branches and 70 at HQ. Both branch offices have about 30 people at them.  HQ has around 80-100<o:p></o:p>

We want to implement a domain so there is user authentication for accessing the computers and preferably a print server at HQ for HQ printers.  We may want to move DHCP to a domain controller.  We also want to utilize group policy.<o:p></o:p>

My questions are the following:<o:p></o:p>

1. Since we are primarily cloud based, would putting a DC on Amazon EC2 or other product be advisable?<o:p></o:p>

2. Should I put RODC at the remote locations?<o:p></o:p>

3. If I have redundant DC's at HQ on 2 different Xenservers and have credential caching, would only have the 2 DC's at HQ be advisable?<o:p></o:p>