What happens if there lights a cable break on a bus topology A dual ring topology'?

In a bus topology, if there is a break in the cable, all devices connected to that segment will lose network connectivity, as the data cannot pass beyond the break. In contrast, a dual ring topology has two rings for data transmission, so if one ring experiences a break, the other ring can still carry the data, allowing the network to continue functioning. However, the devices directly connected to the broken segment will be isolated. Overall, dual ring topologies offer better fault tolerance compared to bus topologies.