On the ROADM board, you need to configure the virtual optical layer service before the optical power is commissioned. Otherwise, the ROADM limit board blocks all wavelengths by default.

• A.TRUE
• B.FALSE

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For the nonlinear effect FWM, which of the following way is correct?

• A.Using large effective area fiber
• B.Do not use G.653 fiber in DWDM systems
• C.Control the incoming fiber power
• D.Control the optical power of a single wavelength

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Which of the following statement about the MPLS-TP OAM level is correct?

• A.Section is the service layer of the tunnel, Tunnel is the service layer of the PW, and PW is the service layer of the Service.
• B.Service is the service layer of the PW, PW is the service layer of the Tunnel, and Tunnel is the service layer of the Section.
• C.Section is the service layer of PW, PW is the service layer of Tunnel, and Tunnel is the service layer of Service.
• D.Tunnel is the service layer of PW, PW is the service layer of Service, and Service is the service layer of Section.

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In the sub-(wave) characterization test, what kind of standard does the isolation test require?

• A.<25dB
• B.>20dB
• C.>25dB
• D.<20dB

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MPLS APS is a network protection mechanism. It implements service switching by using the MPLS OAM detection function.

• A.True
• B.False

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