Final answer:
A ring topology is a physical LAN topology where nodes are connected to each other with a backbone cable that loops around and ends at the same point it started.
Step-by-step explanation:
The physical LAN topology where nodes are connected to each other with a backbone cable that loops around and ends at the same point it started is called a ring topology.
In a ring topology, each node in the network is connected to exactly two other nodes, forming a closed loop. Data travels in one direction around the ring, passing through each node until it reaches the destination.
One advantage of a ring topology is that it provides a reliable network connection, as data can take alternative paths in case one link fails.