Q.Which network device sends incoming data only to the computer it is meant for, rather than to all connected computers?
(A) Hub
(B) Switch
(C) Repeater
(D) Modem

The key difference here is between a device that broadcasts to everyone and one that is intelligent enough to send data only where it is needed.

This makes a switch faster and more secure than a hub. A repeater only strengthens signals and a modem only converts signal types.

Section c contrasts the hub and the switch. A switch is an intelligent device that reads the address on each piece of data and forwards it only to the computer it is meant for, which makes it fast, efficient, and secure. So option (B) is correct.

The distractors do other jobs: a hub (A) is the opposite of a switch — it copies incoming data to every connected computer, which is slow and insecure; a repeater (C) only regenerates and strengthens a weak signal so it can travel further; and a modem (D) converts signals between digital and analog form for Internet access over a phone or cable line. Only the switch sends data selectively to the correct computer.

The usual mistake is to choose 'hub', since a hub also joins many computers. But a hub broadcasts data to all of them; only a switch sends it to the single intended computer. Match the description ('only to the computer it is meant for') to the switch.