4A0-255

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 . RTO/PRO defined the acceptable amount of data (in bits) that can be lost after a failure.C . Data center mirroring has...

What is precision Time Protocol (PTP) designed for?A . Precise time measurementsB . Synchronization of encryption entitiesC . Shortest path discoveryD . Packet-based timing distributionView AnswerAnswer: B

Which of the following statements about the recovery time for protection and restoration combined (PRC) is correct?A . PRC can be as fact as sub-network connection protection (SNCP)B . PRC is as fast as restoration mechanisms.C . PRC has a recovery time that depends on the broken links.D . PRC...

Which of the following best describes Flexgrid?A . Flexgrid is based on flexible amplification stagesB . Flexgrid uses flexible guardband that can take any spacing.C . Flexgrid is defined on a frequency grid spacing based on ,multiples of 12.5 GHz.D . Flexgrid allows channel bandwidth central frequencies and guardband to...

Which of the following is recommended to reduce the latency of a 30km long link?A . DCM-free amplifiersB . Soft-decision FECC . Low-noise amplifiersD . L1 encryptionView AnswerAnswer: C

Which of the following statements about GMPLS features is FALSE?A . GMPLS is able to manage the optical network through the DCC . GMPLS is able to control OTN networks.D . GMPLS is able to compute the routing of the optical channels.E . GMPLS is able to automatically provision the...

Which of the following can be detected through power monitoring with an Optical Time Domain Reflect meter?A . Intrusions on fibersB . Power injection one channelC . Hacking of L1 encryptionD . Intrusions in the cryptographic keysView AnswerAnswer: B

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 non-linear impairment that produces crosstalk at the sum and difference of two wavelengths.C . FWM is a non-linear impairment resulting from varying...

Suppose there is a 40 Gbit/s signal which has a symbol rate of Gbaud/s. Which modulation format is being used?A . QPSKB . BPSKC . 4QAMD . DP-QPSKView AnswerAnswer: C

Consider the exhibit that shows the OTN frame structure. Which of the following sets of label is correct?A . OUT: B: ODU: C: OPU: D: OPUB . OUT: B: ODU: C: OPU: D: OCHC . OPU: B: OTU: C: ODU: D: OPUD . ODU: B: OYU: C: OPU: D: OPUView...