Which data encoding technology is used in fiber-optic cables?
- modulation of specific frequencies of electromagnetic waves
- modulation of electrical voltage
- electrical pulses
- pulses of light
Explanation: Data is transmitted across a network on media. Modern networks primarily use three types of media to interconnect devices:
- Metal wires within cables (copper cable, such as twisted-pair and coaxial cable) - Data is encoded into electrical impulses.
- Glass or plastic fibers within cables (fiber-optic cable) - Data is encoded into pulses of light.
- Wireless transmission - Data is encoded via modulation of specific frequencies of electromagnetic waves.
Exam with this question: Checkpoint Exam: Network Access
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