- A
Light meter
Why wrong: A light meter measures the optical power level at the end of a fiber but cannot locate the distance to a break or splice.
- B
OTDR
An OTDR provides a detailed trace of the fiber, showing the length, loss at splices, and location of breaks, making it essential for troubleshooting fiber links.
- C
Multimeter
Why wrong: A multimeter is used for electrical measurements and cannot be used on fiber optic cables.
- D
Cable tester
Why wrong: Standard cable testers are designed for copper Ethernet cables, not fiber optic cables.
Question 624 of 1,020
220-1201 Networking Tools Practice Question
This 220-1201 practice question tests your understanding of networking tools. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A technician is troubleshooting intermittent packet loss on a critical link between two buildings. The link uses single-mode fiber optic cable. Which tool is specifically designed to measure the length of the fiber and locate breaks or splices that could cause signal loss?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
OTDR
An Optical Time-Domain Reflectometer (OTDR) is the correct tool because it sends a series of light pulses into the fiber and measures the backscattered and reflected light to calculate fiber length, locate breaks, splices, and connectors, and quantify loss at each event. This makes it ideal for troubleshooting intermittent packet loss caused by physical impairments in a single-mode fiber link between buildings.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Light meter
Why it's wrong here
A light meter measures the optical power level at the end of a fiber but cannot locate the distance to a break or splice.
- ✓
OTDR
Why this is correct
An OTDR provides a detailed trace of the fiber, showing the length, loss at splices, and location of breaks, making it essential for troubleshooting fiber links.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Multimeter
Why it's wrong here
A multimeter is used for electrical measurements and cannot be used on fiber optic cables.
- ✗
Cable tester
Why it's wrong here
Standard cable testers are designed for copper Ethernet cables, not fiber optic cables.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Candidates often mistakenly choose a light meter when the question asks for locating breaks or splices, confusing total loss measurement with event location.
Detailed technical explanation
How to think about this question
An OTDR works by launching a high-power laser pulse and analyzing the Rayleigh backscatter and Fresnel reflections over time, converting time-of-flight into distance using the refractive index of the fiber core. In real-world scenarios, a technician might use an OTDR to pinpoint a micro-bend or a dirty connector that causes intermittent loss, which a simple power meter would miss because the loss only occurs under certain conditions like temperature changes or vibration.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 220-1201 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this 220-1201 question test?
Networking Tools — This question tests Networking Tools — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: OTDR — An Optical Time-Domain Reflectometer (OTDR) is the correct tool because it sends a series of light pulses into the fiber and measures the backscattered and reflected light to calculate fiber length, locate breaks, splices, and connectors, and quantify loss at each event. This makes it ideal for troubleshooting intermittent packet loss caused by physical impairments in a single-mode fiber link between buildings.
What should I do if I get this 220-1201 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
This 220-1201 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 220-1201 exam.
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