What type of bridge is most commonly used for immediate traffic needs without configuration?

The most commonly used type of bridge for immediate traffic needs without requiring configuration is a transparent bridge. Transparent bridges operate at the data link layer (Layer 2) of the OSI model and are designed to effectively forward Ethernet frames between network segments without the need for manual setup. They automatically learn the MAC addresses of devices on the network and maintain a forwarding table to efficiently direct traffic.

This characteristic makes transparent bridges ideal for environments where quick implementation is essential, allowing network traffic to flow smoothly and seamlessly without the overhead of configuration. Due to their plug-and-play nature, transparent bridges are favored when setting up or expanding networks, facilitating immediate connectivity without any complex setup.

Other options, while they serve specific purposes in networking, either require additional configuration or are designed for different scenarios that do not align with the immediate traffic needs highlighted in the question.