■ Learning:When the bridge receives an Ethernet frame from a device,it records the source MAC address and the source interface. ■ Flooding:When a bridge receives an Ethernet frame with an unknown destination MAC address,it floods the frame by forwarding it to all forwarding interfaces except for the one on which it received the frame. Filtering:When the bridge receives an Ethernet frame with a destination MAC address on an interface that it has previously recorded the address as a source MAC address,the bridge will filter the frame by discarding it. Forwarding:When the bridge receives an Ethernet frame with a destination MAC address that it has previously recorded and the associated interface is different from the one on which the frame was received,the bridge forwards the frame out of the recorded interface. Aging:When the bridge records a source MAC address and associated interface,it will timestamp the record.If the bridge doesn't see another frame from the source MAC address before an aging timer expires,the record is deleted