UGC NET Questions (Paper – 1)

Statements A, B and C correctly describe star, bus and ring topologies, whereas D gives an incorrect property of mesh topology. Mesh networks are characterised by multiple possible paths between nodes, which supports redundancy and fault tolerance. Saying that there is only one path contradicts the very idea of a mesh. Therefore, the combination containing A, B and C but not D is the only fully correct option.

Option A:
Option A is correct because it brings together the accurate descriptions of three fundamental topologies without including the misleading statement about mesh networks. It shows that star uses a central device, bus uses a shared backbone and ring uses a closed loop. By omitting D, it avoids confusion about the nature of mesh connectivity.

Option B:
Option B is incomplete because it includes only A and B and leaves out C. While star and bus are important, ring topology is also a standard design and must be acknowledged to answer the question fully. Excluding C means not all correct statements are chosen.

Option C:
Option C is incomplete because it groups B and C but omits A. Star topology is widely deployed in modern LANs, so leaving it out fails to recognise one of the most common practical configurations.

Option D:
Option D is incorrect because it accepts all four statements, thereby treating D as correct. Since mesh topology typically offers multiple routes between nodes, D is false, and its inclusion invalidates this combination.