Which function completes this sequence: Forwarding, Learning, and _____ as functions of a bridge?

The sequence describes the key functions of a bridge in networking. Bridges operate primarily through three main processes: forwarding, learning, and filtering.

Forwarding is the process of sending frames to the correct segment of the network based on the destination MAC address. Learning is the mechanism by which the bridge builds a table of addresses that tracks which devices are on each segment of the network, enabling it to make intelligent forwarding decisions.

Filtering is the function that involves preventing unnecessary traffic from being forwarded to segments where it is not needed, which helps in reducing congestion and improves overall network efficiency.

This logical progression shows how each function is integral to the role of a bridge. The option "Filtering" rightly completes the sequence following forwarding and learning, as it is indeed one of the primary operations that bridges perform to manage and direct network traffic appropriately.