Bits can be sent over guided and unguided media as analog signal by ___________

Subject: Computer Networks

Topic: OSI Layer Model

Options:

1. Option A: digital modulation
2. Option B: amplitude modulation
3. Option C: frequency modulation
4. Option D: phase modulation

Correct Answer:

Option 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.