Network topology types – UGC NET Question

Statements A, B and C correctly define star, bus and ring topologies as described in networking theory. They specify how nodes connect to hubs, backbones and loops. Statement D is false because some topologies, especially star, can have single points of failure at central devices. Therefore the correct combination is A, B and C only.

Option A:
Option A is incorrect because it lists only A and B as correct and leaves out C. While A and B are true, C is also correct in describing a ring structure. Excluding C produces an incomplete summary of topologies.

Option B:
Option B is incorrect because it suggests A, C and D are correct, thereby accepting D. Statement D contradicts the idea of a central hub or shared cable that can cause widespread disruption if it fails.

Option C:
Option C is incorrect because it groups B and C only and omits A. Since star topology is one of the most common designs, an explanation that leaves it out is inadequate.

Option D:
Option D is correct because it brings together A, B and C as true and excludes D, which overlooks the possibility of single points of failure. This matches standard discussions of network design.