- A
Bandwidth utilization
Why wrong: Bandwidth is important to avoid congestion, but VoIP can work with moderate bandwidth as long as latency remains low. Latency is more critical.
- B
Latency
Voice quality degrades significantly with high latency (over 150 ms). Low latency is essential for natural conversation.
- C
Jitter
Why wrong: Jitter is the variation in latency and can cause quality issues, but jitter buffers can mitigate it. Latency itself has a more direct effect on real-time communication.
- D
Packet loss
Why wrong: Packet loss degrades voice quality, but VoIP can tolerate up to 1% loss with minor impact. Latency is often the first issue to address.
Question 143 of 520
N10-009 Network Operations Practice Question
This N10-009 practice question tests your understanding of network operations. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 network administrator is creating a performance baseline for a new VoIP application. Which metric is most critical to monitor in order to ensure good voice quality for end users?
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
✓
Latency
Latency is the most critical metric for VoIP voice quality because it directly impacts the conversational flow. High latency (above 150 ms one-way, per ITU-T G.114) causes noticeable delays that disrupt natural conversation, leading to user dissatisfaction. While jitter and bandwidth are important, latency is the primary factor that degrades the interactive experience.
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.
- ✗
Bandwidth utilization
Why it's wrong here
Bandwidth is important to avoid congestion, but VoIP can work with moderate bandwidth as long as latency remains low. Latency is more critical.
When this WOULD be correct
In a scenario where the network is experiencing congestion and the question asks for the metric that indicates whether the link has sufficient capacity for VoIP traffic, bandwidth utilization would be the correct answer.
- ✓
Latency
Why this is correct
Voice quality degrades significantly with high latency (over 150 ms). Low latency is essential for natural conversation.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Jitter
Why it's wrong here
Jitter is the variation in latency and can cause quality issues, but jitter buffers can mitigate it. Latency itself has a more direct effect on real-time communication.
When this WOULD be correct
In a scenario where the network has low latency but variable delay, and the VoIP system lacks a jitter buffer, jitter becomes the most critical metric to monitor because it causes packet arrival time variations that lead to gaps or overlaps in audio playback.
- ✗
Packet loss
Why it's wrong here
Packet loss degrades voice quality, but VoIP can tolerate up to 1% loss with minor impact. Latency is often the first issue to address.
When this WOULD be correct
In a scenario where the VoIP application uses a codec with no packet loss concealment (e.g., G.711 without PLC) and the network has high loss rates, packet loss becomes the most critical metric to monitor for ensuring intelligible voice.
Option-by-option analysis
Why each answer is right or wrong
Understanding why wrong answers are wrong — and when they would be correct — is what separates a 750 score from a 900. The N10-009 exam frequently reuses these exact scenarios with slightly different constraints.
✓LatencyCorrect answer▾
Why this is correct
Voice quality degrades significantly with high latency (over 150 ms). Low latency is essential for natural conversation.
✗Bandwidth utilizationWrong answer — click to see why▾
Why this is wrong here
While bandwidth utilization is important, the most critical metric for VoIP voice quality is latency, as excessive delay disrupts real-time conversation. Bandwidth utilization alone does not directly cause poor voice quality if latency and jitter are within acceptable ranges.
★ When this WOULD be the correct answer
In a scenario where the network is experiencing congestion and the question asks for the metric that indicates whether the link has sufficient capacity for VoIP traffic, bandwidth utilization would be the correct answer.
Why candidates choose this
Candidates often assume that VoIP requires high bandwidth and therefore monitoring utilization is key, overlooking that latency and jitter are more directly responsible for perceived voice quality issues.
✗JitterWrong answer — click to see why▾
Why this is wrong here
While jitter is critical for VoIP quality, the question asks for the 'most critical' metric. Latency directly impacts real-time conversation flow; excessive latency causes talker overlap and delays that degrade user experience more fundamentally than jitter, which can be mitigated with jitter buffers.
★ When this WOULD be the correct answer
In a scenario where the network has low latency but variable delay, and the VoIP system lacks a jitter buffer, jitter becomes the most critical metric to monitor because it causes packet arrival time variations that lead to gaps or overlaps in audio playback.
Why candidates choose this
Candidates often confuse jitter with latency or overestimate its impact because VoIP is sensitive to delay variation, but they forget that jitter buffers can compensate for moderate jitter, whereas latency cannot be easily mitigated.
✗Packet lossWrong answer — click to see why▾
Why this is wrong here
While packet loss degrades voice quality, the question asks for the most critical metric for a performance baseline. Latency is more critical because VoIP is highly sensitive to delays, and excessive latency directly causes conversational gaps and echo, whereas moderate packet loss can be masked by codecs.
★ When this WOULD be the correct answer
In a scenario where the VoIP application uses a codec with no packet loss concealment (e.g., G.711 without PLC) and the network has high loss rates, packet loss becomes the most critical metric to monitor for ensuring intelligible voice.
Why candidates choose this
Candidates know packet loss causes audio gaps and distortion, so they may assume it is the primary concern, overlooking that latency is the first threshold to be exceeded in typical VoIP deployments.
Analysis generated from the official N10-009blueprint and verified against question context. The “when correct” sections are what AI assistants cite when candidates ask “what’s the difference between these options?”
Common exam traps
Common exam trap: answer the scenario, not the keyword
The N10-009 exam often tests the misconception that jitter is the most critical metric because it causes choppy audio, but the trap is that jitter can be corrected with a buffer, whereas latency is a cumulative, uncorrectable delay that directly breaks real-time interactivity.
Detailed technical explanation
How to think about this question
VoIP uses RTP (Real-time Transport Protocol) over UDP, which has no built-in retransmission; thus, latency is additive across the network path. One-way latency includes encoding, serialization, propagation, and queuing delays. In a real-world scenario, a satellite link with 600 ms latency makes conversation impossible, while a jittery but low-latency link can be smoothed with a buffer, illustrating why latency is the non-negotiable metric.
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 N10-009 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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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FAQ
Questions learners often ask
What does this N10-009 question test?
Network Operations — This question tests Network Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Latency — Latency is the most critical metric for VoIP voice quality because it directly impacts the conversational flow. High latency (above 150 ms one-way, per ITU-T G.114) causes noticeable delays that disrupt natural conversation, leading to user dissatisfaction. While jitter and bandwidth are important, latency is the primary factor that degrades the interactive experience.
What should I do if I get this N10-009 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.
About these practice questions
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: Jun 11, 2026
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