Quick Answer
The correct answer is that the IP SLA UDP jitter probe configuration measures one-way delay and jitter using UDP packets. This is because the udp-jitter command sends synthetic UDP traffic between the specified source and destination IP addresses and ports—here, from 198.51.100.1:16384 to 203.0.113.10:16384—and analyzes the time differences between successive packet arrivals to compute both one-way latency and inter-packet delay variation (jitter). On the Cisco CCNP ENARSI 300-410 exam, this question tests your ability to distinguish IP SLA operations: a common trap is confusing UDP jitter with ICMP echo (which only measures round-trip time) or with TCP connect probes. Remember that the key differentiator is the explicit source and destination port numbers, which force UDP-based measurement. Memory tip: “Jitter needs ports—UDP jitter always pairs a source and destination port to track per-packet timing.”
This 300-410 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.
Examine this IP SLA configuration on router R2:
ip sla 20
udp-jitter 203.0.113.10 16384 source-ip 198.51.100.1 source-port 16384 frequency 30
ip sla schedule 20 life forever start-time now
Which statement is true?
It measures one-way delay and jitter using UDP packets.
UDP jitter operation measures delay, jitter, and packet loss.
It measures only packet loss, not delay or jitter.
Why wrong: UDP jitter measures multiple metrics including delay and jitter.
It uses TCP to measure round-trip time.
Why wrong: It uses UDP, not TCP.
It sends ICMP echo requests to test connectivity.
Why wrong: It uses UDP jitter, not ICMP.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
It measures one-way delay and jitter using UDP packets.
The configuration measures UDP jitter by sending UDP packets to destination 203.0.113.10 on port 16384, sourced from 198.51.100.1 with source port 16384, every 30 seconds.
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
For each option: why learners choose it and why it is or isn't the right answer here.
It measures one-way delay and jitter using UDP packets.
It measures only packet loss, not delay or jitter.
Why it's wrong here
UDP jitter measures multiple metrics including delay and jitter.
It uses TCP to measure round-trip time.
It sends ICMP echo requests to test connectivity.
Common exam traps
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
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.
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
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
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 300-410 NAT questions on configuration and troubleshooting.
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FAQ
IP SLA — This question tests IP SLA — Static NAT maps one inside address to one outside address..
The correct answer is: It measures one-way delay and jitter using UDP packets. — The configuration measures UDP jitter by sending UDP packets to destination 203.0.113.10 on port 16384, sourced from 198.51.100.1 with source port 16384, every 30 seconds.
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 300-410 NAT questions on configuration and troubleshooting.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 19, 2026
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