4A0-255 試験問題を無料オンラインアクセス

Which of the following is recommended to reduce the latency of a 30km long link?

• A.DCM-free amplifiers
• B.Low-noise amplifiers
• C.L1 encryption
• D.Soft-decision FEC

Consider the exhibit showing the schematic for an NE ina deployed optical network. Thetraffic growth forecast is for the use of 40 channels in 3 years. The customer needs to reduce thespace for the shelf. Among the following, which additional input is NOT necessary to meet these specific requirements?

• A.Mean time to repair for the equipment
• B.Rack size
• C.Expected traffic added-dropped at the site
• D.Power supply

Suppose that for a given number of buffer credits and for an given average FC frame size, the maximum FC link length is 50 km.
If the average FC frame size is doubled, which of the following is correct?

• A.The buffer credits need to be adjusted to achieve the maximum throughput.
• B.Throughput is doubled.
• C.The throughput is halved.
• D.The Throughput is the same,.

Consider the exhibit. Which type of survivability mechanism is selected for this trail?

• A.Source-based restoration.
• B.Guaranteed restoration
• C.Protection and restoration combined
• D.Optical sub-network connection protection

Which of the following statements about the Decision (HDEFC) decoding and soft decision FEC (SDFEC) decoding is FALSE?

• A.HDFEC discards bits earlier in the decoding process than SDEFC.
• B.HDFEC uses fewer thresholds than SDEFC.
• C.HDFEC provides a higher coding gain than SDEFC
• D.HDFEC injects less latency into the decoding process than SDFEC.