Which statement best describes a WAN's connectivity across sites?

Which statement best describes a WAN's connectivity across sites?

• A. It connects devices only within a single building.
• B. It uses only private networks and no public networks.
• C. It cannot connect multiple sites.
• D. It often uses public telecommunications networks to connect geographically dispersed sites.

Answer: (D)

WAN connectivity across sites means linking geographically dispersed locations so they can communicate as one network. To make this possible, a wide area network often uses public telecommunications networks (such as the Internet) along with private infrastructure to transport data between offices, data centers, and campuses. This is why the statement describing the use of public telecommunications networks to connect geographically dispersed sites is the best description. The other ideas don’t fit: a LAN covers devices within a single building, WANs can and do use public networks in addition to private ones, and WANs are designed to connect multiple sites rather than just a single location.

WAN connectivity across sites means linking geographically dispersed locations so they can communicate as one network. To make this possible, a wide area network often uses public telecommunications networks (such as the Internet) along with private infrastructure to transport data between offices, data centers, and campuses. This is why the statement describing the use of public telecommunications networks to connect geographically dispersed sites is the best description. The other ideas don’t fit: a LAN covers devices within a single building, WANs can and do use public networks in addition to private ones, and WANs are designed to connect multiple sites rather than just a single location.