Bits can be send over guided and unguided media as

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3. Bits can be send over guided and unguided media as analog signal by a) digital modulationb) amplitude modulationc) frequency modulationd) phase modulationView AnswerAnswer: aExplanation: In analog modulation, digital low frequency baseband signal (digital bitstream) are transmitted over a higher frequency. Whereas in digital modulation the only difference is that the base band signal is of discrete amplitude level. 4. The portion of physical layer that interfaces with the media access control sublayer is called 5. physical layer provides
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6. In asynchronous serial communication the physical layer provides 7. The physical layer is responsible for a) line codingb) channel codingc) modulationd) all of the mentionedView AnswerAnswer: dExplanation: The physical layer is responsible for line coding, channel coding and modulation that is needed for the transmission of the information. 8. The physical layer translates logical communication requests from the ______ into hardware specific operations.
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