Online Access Free 4A0-255 Practice Test

Which of the following best describes Flexgrid?

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

Consider the exhibit, where the two highest ports are OT line ports. Which of the following statements is correct?

• A.The OCH protection is implemented.
• B.The E-SNCP protection is implemented.
• C.An OPS is required upstream (left of the OT).
• D.The O-SNCP protection is implemented.

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.

Which of the following statements about an alien wavelength at 10G is correct?

• A.It has similar optical performance across multiple vendors equipment at 10G.
• B.It is an optical signal generated by FWM impairment.
• C.It does not support Wavelengthtracker.
• D.It can be measured by a VAC card.

Consider an OTN-based network controlled by GMPLS. Which of the following statements is correct?

• A.An ODU LSP is routed between two photonic layer nodes.
• B.An OCH LSP can be routed through an ODU LSP.
• C.An ODU LSP can be routed through an OCH LSP.
• D.The routing of the individual ODU frames is based on their label