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4A0-255 Sample Questions Answers

Questions 4

Consider the exhibit that shows a link power budget diagram. Which of the following is represented at location 2?

Options:

A.

Power range

B.

OSNR margin

C.

Minimum attenuation

D.

System aging margin

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Questions 5

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

Options:

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 the most critical level of RTO.RPO among DC applications.

D.

Tier ½ data centers have stricter RTO/PRO requirements than Tire ¾.

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Questions 6

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

Options:

A.

Intrusions on fibers

B.

Power injection one channel

C.

Hacking of L1 encryption

D.

Intrusions in the cryptographic keys

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Questions 7

Which of the following best describes Four Wave Mixing (FWM)?

Options:

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 velocities at different frequencies.

D.

FWM is a linear impairment resulting from pulses broadening over ultra-longdistances

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Questions 8

Refer to the exhibit that shows a demand matrix, a network topology with candidate links (in thick bluelinesand dashed lines), the definednetwork in thick blue lines and the demand routing (colored numbers in the figure). Every link is 80 km long. Which of the following requirements is supported by this network design with the displayed demand routing?

Options:

A.

1+1 protection

B.

Minimum cost design

C.

Minimum latency

D.

Resilience against two link faults

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Questions 9

Consider the exhibit that shows a network with a full mesh fiber structure. Link weights indicate the cost. Future services can be requested between any node pair.

Which of the following topology represents a minimum cost design (minimum overall fiber cost) where link failure survivability is ensured?

A)

B)

C)

D)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 10

Which ofthe following statements about Raman amplification is FALSE?

Options:

A.

Amplification occurs along the fiber

B.

Chromatic dispersion within the fiber is increased.

C.

Flat gain can be achieved in any transmission band.

D.

OSNR is improved compared to EDFAs permitting lingers spans

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Questions 11

Which of the following statement about guaranteed restriction (GR) in generalized Multiprotocol labelSwitching (GMPLS) is correct?

Options:

A.

GR use reestablished backup LSPs with resources reserved and configured.

B.

GR can achieve 100% survivability for a single-failure scenario only.

C.

GR does not required the signaling of the fault to trigger the restoration.

D.

GR calculates a new backup LSP every time a failure occurs.

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Questions 12

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.

Options:

A.

20 dB

B.

10 dB

C.

7 dB

D.

5 bB

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Exam Code: 4A0-255
Exam Name: Nokia Advanced Optical Network Design
Last Update: May 16, 2024
Questions: 40
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