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Frequency band definition and Wireless signal encoding are functions of which layer?

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Frequency band definition and Wireless signal encoding are functions of which layer?

(a) Physical Layer

(b) Logic Link Control Layer

(c) Medium Access Layer

(d) None of the mentioned

This question was addressed to me in an online quiz.

This intriguing question comes from IEEE 802.11 WLAN topic in chapter Wireless Network Security and Network Security Overview of Cryptograph & Network Security

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Right option is (a) Physical Layer

Best explanation: Frequency band definition and Wireless signal encoding are functions of the Physical Layer.

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