Which fiber type has multiple light paths and shorter distances up to about 2 kilometers?

Which fiber type has multiple light paths and shorter distances up to about 2 kilometers?

• A. Cat6a
• B. Multimode Fiber
• C. Single-Mode Fiber
• D. Plenum-Rated Cable

Answer: (B)

The idea tested is how light travels inside a fiber and how that affects distance. Multimode fiber has a larger core that lets light use multiple paths or modes. Those multiple paths arrive at different times, causing modal dispersion, which limits how far the signal can travel cleanly. That’s why multimode fiber is used for shorter links—typically up to about 2 kilometers at common Ethernet data rates. Single-mode fiber, with a much smaller core, guides light along essentially one path and supports far longer distances. The other options aren’t fiber types: Cat6a is copper cable, and plenum-rated cable refers to fire safety in the jacket, not the fiber type. So the description matches multimode fiber.

The idea tested is how light travels inside a fiber and how that affects distance. Multimode fiber has a larger core that lets light use multiple paths or modes. Those multiple paths arrive at different times, causing modal dispersion, which limits how far the signal can travel cleanly. That’s why multimode fiber is used for shorter links—typically up to about 2 kilometers at common Ethernet data rates. Single-mode fiber, with a much smaller core, guides light along essentially one path and supports far longer distances. The other options aren’t fiber types: Cat6a is copper cable, and plenum-rated cable refers to fire safety in the jacket, not the fiber type. So the description matches multimode fiber.