Nokia 4A0-255 Exam - Topic 4 Question 74 Discussion

Actual exam question for Nokia's 4A0-255 exam

Question #: 74
Topic #: 4

[All 4A0-255 Questions]

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

DIntrusions in the cryptographic keys

AIntrusions on fibers

BPower injection one channel

CHacking of L1 encryption

Show Suggested Answer

Suggested Answer: B

by Ahmed at Jan 23, 2026, 12:09 AM

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Tresa

Totally agree, it's super useful for that!

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Georgiana

5 days ago

You can detect faults in fiber optic cables.

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Luz

10 days ago

The OTDR is like a fiber superhero, detecting all the problems before they become a big issue. Fiber maintenance made easy!

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Corazon

15 days ago

Fiber degradation over time is another thing the OTDR can pick up. Gotta keep an eye on that aging infrastructure!

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Delfina

21 days ago

I think the OTDR can also detect bends and kinks in the fiber. That's really useful for troubleshooting.

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Velda

26 days ago

The correct answer is fiber breaks and splices. An OTDR can detect these issues by analyzing the power levels in the optical fiber.

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Clorinda

1 month ago

I’m pretty sure OTDRs are primarily for locating faults, but I think they might also give some insights into power levels indirectly.

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Honey

1 month ago

I feel like we discussed how OTDRs can detect reflections and breaks, but I can't recall if they actually measure power output.

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Mitsue

2 months ago

I remember a practice question that mentioned loss measurements, so maybe it can help identify issues related to power loss in the fiber?

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Trinidad

2 months ago

I think we covered something about detecting faults and splices with the OTDR, but I'm not entirely sure if it can monitor power levels directly.

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Nguyet

2 months ago

I've got a good handle on OTDR principles. I'll systematically go through the answer choices and evaluate which ones fit with the capabilities of this measurement tool.

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Rosendo

2 months ago

Ugh, I'm drawing a blank on this one. I'll have to review my notes and see if I can jog my memory about OTDR functionality.

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Latosha

3 months ago

Okay, let me see. An OTDR measures the backscattered light in an optical fiber, so it should be able to detect things like fiber breaks, splices, and other discontinuities. I'll focus on that.

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Leontine

3 months ago

Hmm, I'm a bit unsure about this one. I'll need to think through the capabilities of an OTDR and what kinds of network problems it can identify.

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Juan

3 months ago

I think I know how to approach this one. I'll start by reviewing the key concepts around optical time domain reflectometry and what types of issues it can detect.

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