A bridge is used for what purpose?

A bridge serves the essential function of connecting two separate networks, facilitating communication between them by forwarding traffic based strictly on MAC addresses without analyzing the data being passed. This process allows a bridge to extend the network segment, improving efficiency and resource sharing among devices on different network segments.

Bridges operate transparently within a network, meaning they do not alter the data packets but simply forward them between the connected networks based on their destination MAC addresses. This is crucial as it helps in managing data traffic without causing congestion and enables network administrators to manage large networks more effectively.

In contrast, the other options describe functions associated with different network devices. The first option pertains to wireless security protocols, the second relates to storage area networks and the use of IP connections, while the fourth option describes a switch or hub's role in providing connectivity within the same local area network. Thus, the function of a bridge is specifically tied to connecting and relaying traffic between distinct networks efficiently.