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A device operating at physical layer is called __________

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A device operating at physical layer is called __________

(a) Router

(b) Equalizer

(c) Bridge

(d) Repeater

I got this question in my homework.

My question is from TCP/IP Protocol topic in portion Network Protocol of Wireless/Mobile

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Right option is (d) Repeater

The best I can explain: A repeater connects two segments of your network cable. It retimes and regenerates the signals to proper amplitudes and sends them to the other segments. Repeaters work only at the physical layer of the OSI network model.

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