Which of the following is the core of fiber optic cables made of?

The correct answer is B. Glass fibers. Fiber optic cables use glass fibers (or sometimes plastic/silica) as the core medium to transmit data as pulses of light. The glass core enables high-bandwidth, low-attenuation transmission over long distances. PVC is typically used for the outer protective jacket, Kevlar strands

Submitted by stefanr· Apr 18, 2026Network and Communications Security

Question

Options

APVC
BGlass fibers
CKevlar
DTeflon

How the community answered

(33 responses)

B
91% (30)
C
6% (2)
D
3% (1)

Explanation

Fiber optic cables use glass fibers (or sometimes plastic/silica) as the core medium to transmit data as pulses of light. The glass core enables high-bandwidth, low-attenuation transmission over long distances. PVC is typically used for the outer protective jacket, Kevlar strands provide tensile strength in the cable sheath, and Teflon is used as an insulating or jacket coating in plenum-rated cables. None of those materials form the signal-carrying core.

Topics

#Fiber optics#Cable components#Network infrastructure

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