I have a Domain with Multiple sites(Site A and Site B) that are connected by
slow links. We have DFS set up at Site A but would like to set up replicas
in Site B so that they will have faster access to the shares. My question
how do I prevent people in Site A from accessing replicas in Site B and vice
versa. Is this done by default by subnets assigned to the sites? I don't
want it to take an hour to access files that should only take seconds.

Thanks in advance