642-311  Exam

Exam # of questions Description  Update
642-311 51 642-311... 02/15/2011
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642-311 - Exam Information
  • Description: Cisco Optical SONET Exam
  • Passing Score: 75%
  • Practice Test - Number of questions: 51 questions
  • Simulation Test - Number of questions: 51 questions
  • Simulation Test Duration: 90 minutes
  • Has explanations: Yes

Question of the day

Exhibit: When designing a DWDM system with multiple amplified spans, a pre-amp is needed at Site B to _____. (Choose three.)

Answer(s)

  1. offset the OADM loss at Site B
  2. overcome the high multiplexer loss at Site A
  3. amplify signal levels after the high loss through Fiber Span 1
  4. adjust add channels at Site B to be at the same level as the passthrough channels
  5. ensure that the per channel power is higher than the minimum needed for the post-amp atSite B
Correct Answer

offset the OADM loss at Site B

amplify signal levels after the high loss through Fiber Span 1

ensure that the per channel power is higher than the minimum needed for the post-amp atSite B