You are the administrator of a three-domain, two-site, Active Directory Domain Services forest. Users are reporting extremely slow logon times at a site that does not have a domain controller. Users in the other domains have the same problem at the same site. Initial testing shows that the link speeds are not slow between the client and their domain. Users in the other two sites are not having the same problem. Some users who encountered the issues traveled to one of the other sites but did not experience the problem there. However, the issue recurs when they return to their home site. You again verified that the link speeds were adequate. What other considerations should you take into account?