You are the network administrator for a company with a single Active Directory domain. The corporate office is located in Miami and there are satellite offices in Boston and Chicago. There are Active Directory sites configured for all three geographic sites configured for all three geographic locations. The Default-First-Site-Name was renamed to become the Miami site. Each location has a single IP subnet configured and associated with the appropriate site. Each office has several domain controllers. The Boston office has recently expanded to three additional floors in the office building that they are in. The additional floors each have their own IP subnet and are connected by a router. The domain controllers for the Boston office are all located on one floor and are in the same subnet. You notice that users working on the new floors in the Boston office are sometimes authenticating to domain controllers from other locations. You need to make sure that all authentication traffic over the WAN links is kept to a minimum. What should you do?