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Module 1: Physical Layer & Data Communication

20212m

Which transmission media has the highest transmission speed in a network?

(i) Coaxial cable
(ii) Twisted pair cable
(iii) Optical fiber
(iv) Electrical cable

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Answer

(iii) Optical fiber

Explanation

Optical fiber transmits data using pulses of light through glass or plastic fiber. It supports very high bandwidth and transmission speeds compared with traditional copper media.

Advantages include:

  • Very high bandwidth.
  • Low attenuation over long distances.
  • Immunity to electromagnetic interference.
  • Suitable for high-speed backbone and long-distance communication.

Therefore, among the given options, optical fiber has the highest transmission speed.

Final answer: (iii) Optical fiber.

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