- A
Ordered delivery guarantee
Why wrong: UDP does not guarantee order.
- B
Connection-oriented setup
Why wrong: UDP is connectionless.
- C
No retransmission of lost packets
Correct. UDP does not retransmit, causing gaps in audio.
- D
Flow control mechanism
Why wrong: UDP has no flow control.
Question 594 of 1,000
200-901 Network Fundamentals Practice Question
This 200-901 practice question tests your understanding of network fundamentals. 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.
An engineer is troubleshooting a VoIP call quality issue. The call uses UDP and experiences packet loss. Which characteristic of UDP most likely contributes to the problem?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
✓
No retransmission of lost packets
UDP is a connectionless transport protocol that does not provide retransmission of lost packets. In VoIP, packet loss directly degrades call quality because lost audio data is never resent, leading to gaps or distortion in the conversation.
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.
- ✗
Ordered delivery guarantee
Why it's wrong here
UDP does not guarantee order.
- ✗
Connection-oriented setup
Why it's wrong here
UDP is connectionless.
- ✓
No retransmission of lost packets
Why this is correct
Correct. UDP does not retransmit, causing gaps in audio.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Flow control mechanism
Why it's wrong here
UDP has no flow control.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the misconception that UDP's lack of reliability is always a flaw, but the trap here is that candidates may incorrectly attribute the problem to UDP's lack of ordered delivery or flow control, when the core issue is the absence of retransmission for lost packets.
Detailed technical explanation
How to think about this question
VoIP applications like SIP/RTP rely on UDP for low-latency streaming, but packet loss triggers PLC (Packet Loss Concealment) algorithms in codecs such as G.729 or Opus to mask missing audio. In real-world deployments, jitter buffers and FEC (Forward Error Correction) are often used to mitigate UDP's lack of retransmission, but severe loss still causes audible artifacts.
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 200-901 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 200-901 question test?
Network Fundamentals — This question tests Network Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: No retransmission of lost packets — UDP is a connectionless transport protocol that does not provide retransmission of lost packets. In VoIP, packet loss directly degrades call quality because lost audio data is never resent, leading to gaps or distortion in the conversation.
What should I do if I get this 200-901 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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Last reviewed: Jul 4, 2026
This 200-901 practice question is part of Courseiva's free Cisco 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 200-901 exam.
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