Free Nokia 4A0-255 Exam Dumps Questions & Answers

Which of the following statements about power commissioning system is most accurate?

• A.  A system must be a ring only
  A system cannot stop if there is a through connection in a node.
• B.  A system must be either linear or a ring
  A system cannot stop if there is a through connection in a node
• C.  A system must be either linear or a ring.
  A system can stop if there is a through communication in a node.
• D.  A system must be a ring only
  A system can stop if there is a through connection in a node.

Which of the following best describes Four Wave Mixing (FWM)?

• A.  FWM is a linear impairment that produces crosstalk four adjacent wavelengths are used.
• B.  FWM is a linear impairment resulting from pulses broadening over ultra-longdistances
• C.  FWM is a non-linear impairment that produces crosstalk at the sum and difference of two wavelengths.
• D.  FWM is a non-linear impairment resulting from varying velocities at different frequencies.

Consider the exhibit. Which of the following NE architectures is represented?

• A.  (Classic) ROADM
• B.  C-F ROADM
• C.  TOADm
• D.  CDC-F ROADm

Which ofthe following statements about Raman amplification is FALSE?

• A.  OSNR is improved compared to EDFAs permitting lingers spans
• B.  Flat gain can be achieved in any transmission band.
• C.  Amplification occurs along the fiber
• D.  Chromatic dispersion within the fiber is increased.

What does region coloring in GMPLS enable?

• A.  Efficient spectral utilization
• B.  Administrative segregation
• C.  Government level certification
• D.  Multi-layer network support