4A0-255 試験問題を無料オンラインアクセス

Which of the following about the Optical channel Transport Unit (OUT0 in ONT network is correct?

• A.OUT refers to the section between two amplifiers.
• B.OUT refer to the section between two multiplexers passing through one or moreamplifiers.
• C.OUT enables FEC processing.
• D.OUT enables the multiplexing of OCH connections.

Which of the following can be detected through power monitoring with an Optical Time Domain Reflect meter?

• A.Intrusions on fibers
• B.Hacking of L1 encryption
• C.Intrusions in the cryptographic keys
• D.Power injection one channel

Consider two EDFA amplifiers in cascade. Each EDFA has an average input signal power of 10 mW and an average noise power of 1 mW. What is the OSNR of the system at the receiver.

• A.10 dB
• B.5 bB
• C.20 dB
• D.7 dB

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

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

What does region coloring in GMPLS enable?

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