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What is the central device in star topology?

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What is the central device in star topology?

(a) STP server

(b) Hub/switch

(c) PDC

(d) Router

I have been asked this question in an international level competition.

Question is from STP Cables in portion Security & Physical Layer of Computer Network

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The correct answer is (b) Hub/switch

For explanation I would say: In star topology, no computer is connected to another computer directly but all the computers are connected to a central switch or hub. Every message sent from a source computer goes through the switch or hub and the switch or hub then forwards the message only to the intended destination computer.

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