Free Practice Questions for Nokia 4A0-255 Exam

Question 1

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

AGR use reestablished backup LSPs with resources reserved and configured.

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

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

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

Correct Answer: A. GR use reestablished backup LSPs with resources reserved and configured.

Question 2

Where is guardband mandatory for EMF?

ABetween 10G and 40G channels

BBetween 10G and 100G channels

CBetween 10G and 200G channels

DBetween 40G and 100G channels

Correct Answer: C. Between 10G and 200G channels

Question 3

Refer to the exhibit.

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?

AUse a FEC with a lower code rate

BUse 3R regeneration at Site2

CUse a DCM at Site 2
D, Use a Raman amplifier at Site2

Correct Answer: A. Use a FEC with a lower code rate

Question 4

Consider an OTN-based network controlled by GMPLS. Which of the following statements is correct?

AAn OCH LSP can be routed through an ODU LSP.

BAn ODU LSP can be routed through an OCH LSP.

CAn ODU LSP is routed between two photonic layer nodes.

DThe routing of the individual ODU frames is based on their label

Correct Answer: D. The routing of the individual ODU frames is based on their label

Question 5

Which of the following is NOT a functionality provided by a coherent receiver?

AAnalog-to-digital conversion (ADC)

BDigital signal processing (DSP)

CMixing

DDemultiplexing

Correct Answer: C. Mixing

Question 6

Consider the exhibit, where the two highest ports are OT line ports. Which of the following statements is correct?

AThe OCH protection is implemented.

BThe O-SNCP protection is implemented.

CThe E-SNCP protection is implemented.

DAn OPS is required upstream (left of the OT).

Correct Answer: D. An OPS is required upstream (left of the OT).