Network devices and roles – UGC NET Question

All four statements accurately describe widely used networking devices in ICT. Hubs do broadcast incoming data to all ports, switches selectively forward frames based on MAC addresses, routers connect and route between networks and modems perform modulation and demodulation for transmission over certain media. Since there is no incorrect statement among A, B, C and D, the combination that includes all four is the only correct answer.

Option A:
Option A is incorrect because it leaves out statement D and includes only A, B and C. Although these three are correct, statement D is also true about modems. Omitting a correct statement means this option does not represent the complete set of correct statements.

Option B:
Option B is incorrect because it restricts the set to B, C and D and omits A. Statement A is a true description of how hubs broadcast traffic. Excluding a correct statement prevents this combination from being fully accurate.

Option C:
Option C is correct because it includes A, B, C and D, all of which are true. Together, they cover the basic behaviours of hubs, switches, routers and modems in network communication. As there is no false statement in the list, selecting all of them is consistent with the question.

Option D:
Option D is incorrect because it includes only A and D and omits B and C. While A and D are true, leaving out two other true statements makes the combination incomplete. A valid answer should include all correct statements, not just a subset.