642-321 Cisco Optical SDH Exam (SDH)
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Note 2: 642-321 Answers are not shown in demo questions.
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Demo Question 5.
What three in combination are factors that can cause four-wave mixing in the fiber-optic cables? Choose three
A. Low optical power
B. High optical power
C. Few optical channels
D. Many optical channels
E. Low chromatic dispersion
F. High chromatic dispersion
G. Too much power differential in the optical channels
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Answer: B, D, F
Ref. CiscoPress "Optical Network Design and Implementation" pp. 69-70,
CiscoPress "DWDM Network Design and Engineering Solutions" p. 2
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