What technology joins two independent computer networks for communication?

The correct technology that joins two independent computer networks for communication is a bridged network. A bridged network connects separate networks at the data link layer (Layer 2) of the OSI model. This allows them to function cohesively as one large network, enabling devices on different segments to communicate with each other seamlessly.

In practical applications, a bridge functions by filtering traffic based on MAC addresses, thereby minimizing collisions and improving overall efficiency. Bridging is particularly useful for integrating older network technology with newer technologies or for extending the range of a network without losing the structure and efficiency of independent segments.

Routers, while they also connect different networks, operate primarily at the network layer (Layer 3) and have the additional function of directing data packets between networks based on IP addresses. Firewalls serve to protect networks from unauthorized access and may also filter traffic but are not specifically designed for connecting networks. Switches work within a single network by connecting devices and managing data traffic at Layer 2 but do not connect independent networks in the way a bridge does.