For which three issues should fiber-optic network segments be tested? (Choose three.)

Question

Options

• Aattenuation
• Bnear-end crosstalk
• Clength
• Dpolarity
• Ejitter
• Ftensile stress

• A
  77% (33)
• B
  14% (6)
• E
  7% (3)
• F
  2% (1)

Explanation

Fiber-optic segments are tested for attenuation (signal loss over distance), length (to verify the run doesn't exceed spec limits for the fiber type), and polarity (to confirm the transmit end on one side connects to the receive end on the other) - all three directly affect whether light signals successfully traverse the link. Near-end crosstalk (B) is a copper-specific problem caused by electromagnetic interference between wire pairs; fiber uses light, so crosstalk is irrelevant. Jitter (E) is a timing/performance metric measured at the network layer, not a physical fiber segment test. Tensile stress (F) is an installation concern (don't over-bend or over-pull fiber), not something you measure with fiber test equipment on a completed segment.

Memory tip: Think "A-C-D = All Clear, Done" - you test fiber to confirm the signal gets through (Attenuation), goes the right distance (C = length), and flows in the right Direction (Polarity). Everything else on the list belongs to copper or upper-layer testing.

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