Which of the following best describes a Wide Area Network (WAN)?

A Wide Area Network (WAN) is characterized by its ability to connect multiple local networks across large geographical distances, often utilizing a service provider's infrastructure, such as leased lines or satellite links. This allows organizations to link branch offices, remote work sites, and users who are geographically dispersed, facilitating communication and resource sharing over wide areas.

The definition aligns with the characteristics of WANs, which typically manage high-speed connections over significant distances, contrasting with local networks (Local Area Networks or LANs) that connect devices within a confined area like a single building. This enables businesses to create a cohesive network that integrates various locations, thereby enhancing functionality and collaboration across sites.

In comparison, the other options focus on different types of networks. For example, a local network within a single building describes a LAN rather than a WAN. Peer-to-peer networks are decentralized and typically lack a central server, which does not illustrate the expansive connectivity of a WAN. A wireless network confined to a room would again refer to a LAN or personal area network, emphasizing a limited scope rather than the extensive reach of a WAN.