Certified Network Defender (CND) — Question 59

Which of the following cables is made of glass or plastic and transmits signals in the form of light?

Answer options

• A. Coaxial cable
• B. Twisted pair cable
• C. Plenum cable
• D. Fiber optic cable

Correct answer: D

Explanation

The correct answer is D, Fiber optic cable, which uses light to transmit data through glass or plastic fibers. Options A (Coaxial cable) and B (Twisted pair cable) transmit signals electrically, while C (Plenum cable) refers to a type of cable designed for air handling spaces, not specifically related to signal transmission methods.