Which of the following is a feature of the physical structure in Active Directory?

• A. Domains
• B. Sites
• C. Organizational Units
• D. Schema

Answer: (B)

The key idea here is distinguishing how Active Directory is organized physically versus logically. The physical structure models how the network and servers are actually arranged across locations, focusing on factors like where domain controllers reside and how replication and logon traffic move between sites.

Sites are the feature that represents this physical layout. They group domain controllers (and the clients that rely on them) by geographic or network proximity, which lets AD optimize authentication and replication. By using sites, AD can direct clients to the nearest or most appropriate domain controller, and it can control replication traffic between locations through site links, schedules, and costs. Subnets map to sites to ensure clients find the closest DC automatically.

Domains, Organizational Units, and Schema are part of the logical design rather than the physical one. Domains define security boundaries and a namespace; Organizational Units are containers used for delegation and applying policies; Schema defines the types of objects and attributes that AD can store and manage. Because the question targets a physical-structure feature, Site is the best fit.