Quick Answer
The answer is ICMP Path Echo. This IP SLA operation type uses ICMP to discover the network path between source and destination by sending ICMP Echo requests with incrementally increasing TTL values, exactly like a traceroute, and recording each hop’s response. On the Cisco CCNP ENARSI 300-410 exam, this question tests your understanding of IP SLA operation types for path discovery, often appearing alongside other types like UDP Jitter or ICMP Echo; a common trap is confusing ICMP Path Echo with standard ICMP Echo, which only measures reachability and round-trip time, not the hop-by-hop path. Remember that the operation number is type 10, and think of “Path Echo” as “traceroute in IP SLA” — the TTL trick is the key mechanism. A simple memory tip: “Path Echo traces the route, Echo just pings the root.”
This 300-410 practice question tests your understanding of ip sla. 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.
Which IP SLA operation type uses ICMP to discover the path (hops) between source and destination?
ICMP Echo
Why wrong: ICMP Echo only tests reachability to a single destination, not the path.
ICMP Path Echo
Correct. ICMP Path Echo discovers the path by incrementing TTL.
UDP Jitter
Why wrong: UDP Jitter does not trace the path.
TCP Connect
Why wrong: TCP Connect does not trace the path.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
ICMP Path Echo
The ICMP Path Echo operation (type 10) uses ICMP Echo requests with increasing TTL values to trace the path from source to destination, similar to traceroute.
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.
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: ICMP Path Echo — The ICMP Path Echo operation (type 10) uses ICMP Echo requests with increasing TTL values to trace the path from source to destination, similar to traceroute.
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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