Online Access Free 4A0-255 Exam Questions

Which of the following best describes Flexgrid?

• A.Flexgrid uses flexible guardband that can take any spacing.
• B.Flexgrid is based on flexible amplification stages
• C.Flexgrid is defined on a frequency grid spacing based on ,multiples of 12.5 GHz.
• D.Flexgrid allows channel bandwidth central frequencies and guardband to take any value in the spectrum range.

Which of the following is NOTan advantage of super-channels?

• A.Improved spectral efficiency
• B.Simplified management of the carriers
• C.Narrower spacing between carries of the super-channel
• D.Impairment-free transmission

Consider a signal at 100G PDM-QSK. Which of the following statements is true?

• A.The Gbaud rate is 50.
• B.It has the same Gbaud rate as 100G 8QAM.
• C.Each symbol supported 2 bits per polarization.
• D.It supports more bits per symbol per polarization than 8QAM

Which ofthe following statements about Raman amplification is FALSE?

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

Consider the exhibit. The grey sites (Site 1 through Site6) from an existing network, which will be extended by adding Site7 and Site8. Which of the following is NOT a common source of interoperability issues for this network extension?

• A.Regeneration requirements at Site5
• B.Fiber connectors at Site6
• C.Cascading in the existing network
• D.Spectrum grid of the extension