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The physical layer is responsible for __________

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The physical layer is responsible for __________

(a) line coding

(b) channel coding

(c) modulation

(d) all of the mentioned

This question was addressed to me during a job interview.

I would like to ask this question from Physical Layer in portion OSI Model of Computer Network

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The correct option is (d) all of the mentioned

To explain I would say: The physical layer is responsible for line coding, channel coding and modulation that is needed for the transmission of the information. The physical configuration including pins, connectors and the electric current used is dealt in the physical layer based on the requirement of the network application.

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