The correct answer is that this IP SLA UDP echo probe configuration tests UDP connectivity by sending a UDP packet and expecting a response. The udp-echo command directs router R6 to generate a UDP packet destined for 203.0.113.1 on port 2000, sourced from 198.51.100.1, and then wait for an echo reply from the target; if the target responds, the probe confirms bidirectional UDP reachability and measures round-trip time. On the Cisco CCNP ENARSI 300-410 exam, this configuration often appears in questions about service-level monitoring or troubleshooting one-way voice/video issues, where a common trap is confusing UDP echo with ICMP echo—remember that UDP echo tests Layer 4 transport, not Layer 3 reachability. A key memory tip: think “UDP Echo = Layer 4 handshake,” unlike ping which only checks Layer 3.
300-410 IP SLA Practice Question
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.
Consider this IP SLA configuration on router R6:
ip sla 60
udp-echo 203.0.113.1 2000 source-ip 198.51.100.1
frequency 20
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
It tests UDP connectivity by sending a UDP packet and expecting a response.
The configuration sends UDP packets to destination 203.0.113.1 on port 2000, sourced from 198.51.100.1, every 20 seconds. It tests UDP connectivity and response time.
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.
✓
It tests UDP connectivity by sending a UDP packet and expecting a response.
Why this is correct
UDP echo operation sends a UDP datagram and waits for a reply to measure round-trip time.
Related concept
Static NAT maps one inside address to one outside address.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this 300-410 question in full detail.
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.
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: It tests UDP connectivity by sending a UDP packet and expecting a response. — The configuration sends UDP packets to destination 203.0.113.1 on port 2000, sourced from 198.51.100.1, every 20 seconds. It tests UDP connectivity and response time.
What should I do if I get this 300-410 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 300-410 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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