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Computer Networks
Physical Layer
Q
Bits can be sent over guided and unguided media as analog signal by ___________
AA. Digital modulation
BB. Amplitude modulation
CC. Frequency modulation
DD. Phase modulation
Correct Answer:
A. A. Digital modulation
Explanation:
In analog modulation, digital low frequency baseband signal (digital bit stream) is transmitted over a higher frequency. Whereas in digital modulation the only difference is that the base band signal is of discrete amplitude level. The bits are represented by only two frequency levels, one for high and one for low.
