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300-410 Practice Question: Which IP SLA operation type uses ICMP to discover…
Which IP SLA operation type uses ICMP to discover the path (hops) between source and destination?
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
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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.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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ICMP Echo
Why it's wrong here
ICMP echo verifies round-trip reachability and latency to a single destination, returning no per-hop addresses. It is tempting because it uses ICMP like the path-discovery operation, and ICMP echo would be correct when confirming whether a specific target host responds.
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ICMP Path Echo
Why this is correct
ICMP Path Echo uses ICMP echo requests with incrementing TTL values to discover each hop along the path, satisfying the requirement to identify the route between source and destination. Unlike basic ICMP Echo, which only tests reachability to the final target, Path Echo maps intermediate devices hop by hop.
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UDP Jitter
Why it's wrong here
UDP jitter measures delay variation and packet loss between endpoints using UDP probes, so it never returns hop-by-hop addresses. It is tempting because jitter operations do traverse the path, and UDP jitter would be correct when assessing voice or video quality across a network.
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TCP Connect
Why it's wrong here
TCP Connect opens a socket to a target port to measure reachability, so it never reveals the hop-by-hop path. It is tempting because it verifies application-layer availability, and would be correct when you need to confirm a specific TCP service responds on a given port.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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