Which topology has each node connected to exactly two other nodes?

• A. Ring
• B. Star
• C. Mesh
• D. Bus

Answer: (A)

Think about how many direct links each device has in the network layout. In a ring topology, every device connects to exactly two other devices—one on each side—forming a closed loop. This gives every node a degree of two, which matches the requirement. In contrast, a star topology centers on a single hub, so leaf devices connect to the hub (one connection each) while the hub has many connections. A mesh topology involves multiple interconnections, typically giving nodes more than two connections. A bus topology uses a single shared cable that all devices attach to, so devices don’t have two distinct neighbors. Therefore, the ring is the topology where every node has two neighbors.