Which two options describe two benefits of Flex Spectrum? (Choose two.)

Question

Options

• Amore efficient spectrum usage
• Blonger supported distances
• Csupport for transport of superchannels
• Deliminate dispersion compensation

• A
  85% (29)
• B
  9% (3)
• D
  6% (2)

Explanation

Flex Spectrum (flexible grid) replaces fixed-width channel spacing with variable-width slots (as narrow as 12.5 GHz), which packs channels more tightly and reduces wasted spectrum between them - making A (more efficient spectrum usage) correct. It also supports C (superchannels) because a superchannel bundles multiple sub-carriers into one wide, contiguous block; the flexible grid can allocate exactly the right bandwidth for that block, whereas a fixed grid cannot.

B (longer distances) is wrong - reach depends on modulation format, amplification, and fiber properties, none of which Flex Spectrum changes. D (eliminate dispersion compensation) is wrong - dispersion is a physical fiber phenomenon handled by DCMs or DSP, completely separate from how spectrum is sliced.

Memory tip: Think "Flex fits more, Flex fits big" - it fits more channels efficiently (A) and fits big superchannels that wouldn't align to a rigid grid (C).

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