In Active Directory Domain Services, what is the purpose of a site?

• A. Represents a logical domain structure with hierarchical naming
• B. Represents a physical network location and guides replication topology and logon access to the closest DC
• C. Is used to manage password policies across sites
• D. Contains only read-only data for disaster recovery

Answer: (B)

Sites in Active Directory represent physical network locations and are used to optimize how authentication and replication happen. By grouping subnets into a site, clients discover and connect to the nearest domain controller for logon, which reduces login times and uses network bandwidth more efficiently. Replication is then managed with site boundaries: frequent, low-cost replication within a site, and scheduled, cost-aware replication between sites using site links and their costs and timings. This arrangement directly surrounds the idea of guiding replication topology and logon access to the closest domain controller.

It isn’t about the logical domain structure, password policy management across sites, or storing data as read-only; those pertain to other aspects of AD and its policy or data stores.