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How does a switch differ from a hub in a local area network?
AIt sends incoming data out on every connected line
BIt converts analog signals into digital bits and back
CIt regenerates a weakened signal on a long cable run
DIt reads the destination address and forwards only there
Answer & Solution
Correct answer: D. It reads the destination address and forwards only there
1. A hub sends data arriving on any of its lines out on all the others, so traffic can collide.
2. A switch instead extracts the destination address from the arriving data packet.
3. It looks that address up in a table to decide where the packet should go.
4. It therefore sends signals to only selected devices instead of sending to all, and can forward several packets at once.
5. Option A is the hub's behaviour, option B is a modem's and option C is a repeater's.
_Source: NCERT Computer Science Class 12, Ch 10 'Computer Networks', S10.4.6 Switch_
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