Online Access Free 4A0-255 Exam Questions

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

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

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 ofthe following statements about Raman amplification is FALSE?

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

Which if the following statements about Recovery Time Objective (RTO) and Recovery Point Object Point Objective (PRO) is FALSE?

• A.RTO/PRO define business continually requirements for data center.
• B.Data center mirroring has the most critical level of RTO.RPO among DC applications.
• C.RTO/PRO defined the acceptable amount of data (in bits) that can be lost after a failure.
• D.Tier ½ data centers have stricter RTO/PRO requirements than Tire ¾.

Which of the following statements about Bit Error Rate (BER) is correct?

• A.BER is the ratio of redundant bits to correct bits.
• B.BER is measured at both the transmitted and receiving ends.
• C.BER can be accurately measured in a short period of time , for any rate.
• D.BER can be measured beforeafter the FEC decoding.