- A
The IP SLA operation is configured with a 'num-packets' value of 1, so only one packet is sent per probe, and jitter cannot be calculated.
Correct. Jitter requires at least two packets to measure variation. By default, UDP jitter sends 10 packets, but if the engineer changed it to 1, jitter will be zero.
- B
The remote router's IP SLA responder is not configured to calculate jitter, only to echo packets.
Why wrong: Incorrect because the responder only echoes packets; the jitter calculation is done by the source router based on the timing of the returned packets.
- C
The IP SLA operation is using a 'frequency' that is too high, causing the probes to be sent too quickly and jitter to be zero.
Why wrong: Incorrect because frequency does not affect the number of packets per probe; it only controls how often probes are sent.
- D
The network path has no variable delay, so jitter is naturally zero.
Why wrong: Incorrect because even in a stable network, there is usually some variation; but the more direct cause is the single packet configuration.
350-401 IP SLA Practice Question
This 350-401 practice question tests your understanding of ip sla. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 engineer configures IP SLA 60 to monitor the jitter of a VoIP call path between two sites. The operation uses UDP jitter with a target of 192.168.3.3 on port 16384. The engineer notices that the IP SLA operation shows 'State: Active' and 'Latest RTT: 10 ms', but the jitter values are all zero. The remote router has an IP SLA responder configured. What is the most likely cause?
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
The IP SLA operation is configured with a 'num-packets' value of 1, so only one packet is sent per probe, and jitter cannot be calculated.
Jitter is calculated as the variation in delay between consecutive packets. If only one probe packet is sent per operation, there is no variation to measure, so jitter will be zero. The IP SLA UDP jitter operation must send multiple packets per probe to calculate jitter.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
The IP SLA operation is configured with a 'num-packets' value of 1, so only one packet is sent per probe, and jitter cannot be calculated.
Why this is correct
Correct. Jitter requires at least two packets to measure variation. By default, UDP jitter sends 10 packets, but if the engineer changed it to 1, jitter will be zero.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Static NAT maps one inside address to one outside address.
- ✗
The remote router's IP SLA responder is not configured to calculate jitter, only to echo packets.
Why it's wrong here
Incorrect because the responder only echoes packets; the jitter calculation is done by the source router based on the timing of the returned packets.
- ✗
The IP SLA operation is using a 'frequency' that is too high, causing the probes to be sent too quickly and jitter to be zero.
Why it's wrong here
Incorrect because frequency does not affect the number of packets per probe; it only controls how often probes are sent.
- ✗
The network path has no variable delay, so jitter is naturally zero.
Why it's wrong here
Incorrect because even in a stable network, there is usually some variation; but the more direct cause is the single packet configuration.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP SLA — This question tests IP SLA — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: The IP SLA operation is configured with a 'num-packets' value of 1, so only one packet is sent per probe, and jitter cannot be calculated. — Jitter is calculated as the variation in delay between consecutive packets. If only one probe packet is sent per operation, there is no variation to measure, so jitter will be zero. The IP SLA UDP jitter operation must send multiple packets per probe to calculate jitter.
What should I do if I get this 350-401 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related 350-401 NAT questions on configuration and troubleshooting.
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?
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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