Free Nokia 4A0-255 Exam Dumps Questions & Answers


Exam Code/Number:	4A0-255Join the discussion
Exam Name:	Nokia Advanced Optical Network Design
Certification:	Nokia
Free Question Number:	40
Publish Date:	Oct 04, 2026
# of views:	2239
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Total 40 questions

Question 1

Consider the above exhibit, which shows a WDM network map from EPT. A new trail at 10G needs to be created from Site1 to Site3. The design tool routes the trail through Site1 but the trail is evaluated as invalid due to insufficient OSNR margin. Among the following option, which is NOT effective for making the 10G trail valid?

A.Use 3R regeneration at Site2
B.Use a DCM at Site 2
D, Use a Raman amplifier at Site2
C.Use a FEC with a lower code rate

Question 2

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

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

Question 3

Suppose there is a 40 Gbit/s signal which has a symbol rate of Gbaud/s. Which modulation format is being used?

A.DP-QPSK
B.QPSK
C.4QAM
D.BPSK

Question 4

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

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

Question 5

What does an OPU tributary slot contain, when multiplexing OTN frames?

A.An OH byte
B.An ODU.
C.An OUT.
D.An OPU.