- A
The IP SLA operation uses a different source address than the ping command, causing the remote router to drop the packets due to uRPF.
Why wrong: While source address matters, the primary issue is the lack of IP SLA responder on the remote side.
- B
The IP SLA ICMP echo operation requires the IP SLA responder to be enabled on the remote router; without it, the operation may time out even if standard ping succeeds.
IP SLA ICMP echo uses a specific protocol format that differs from standard ping; the responder is needed for proper operation.
- C
The IP SLA operation is blocked by an ACL on the local router that permits ICMP but denies IP SLA packets.
Why wrong: IP SLA ICMP echo uses ICMP type 8, same as ping, so ACLs permitting ping would also permit IP SLA.
- D
The IP SLA operation has a frequency that is too high, causing the router to rate-limit the probes.
Why wrong: Rate-limiting is not the default behavior; frequency alone does not cause timeouts.
Quick Answer
The answer is that the IP SLA ICMP echo operation requires the IP SLA responder to be enabled on the remote router, and without it, the operation will time out even when standard ping succeeds. This happens because IP SLA ICMP echo operations use a different packet processing path and timing mechanism than a basic ping; the responder ensures precise round-trip time measurement and proper packet handling, whereas a standard ping may succeed due to less strict timing or different ICMP processing. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding of IP SLA operation requirements versus simple connectivity verification—a common trap is assuming that reachability via ping guarantees IP SLA success. Remember the memory tip: “Ping proves path, but SLA needs a responder for the clock.”
300-410 IP SLA Practice Question
This 300-410 practice question tests your understanding of ip sla. Examine the command output carefully: the correct answer depends on what the output actually shows, not on general recall alone. 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.
An engineer configures IP SLA with an ICMP echo operation to track a remote host, but the IP SLA responder is not configured on the remote router. The IP SLA operation shows 'Timeout' in the show ip sla statistics output. The engineer expects the operation to succeed because the remote host is reachable via ping. Which is the most likely explanation?
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 ICMP echo operation requires the IP SLA responder to be enabled on the remote router; without it, the operation may time out even if standard ping succeeds.
IP SLA ICMP echo operations require the IP SLA responder to be enabled on the remote device for accurate round-trip time measurement; without it, the operation may still work but can time out due to packet processing differences, or the operation may fail entirely if the remote device does not respond to ICMP echo requests in a timely manner as per IP SLA expectations.
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 uses a different source address than the ping command, causing the remote router to drop the packets due to uRPF.
Why it's wrong here
While source address matters, the primary issue is the lack of IP SLA responder on the remote side.
- ✓
The IP SLA ICMP echo operation requires the IP SLA responder to be enabled on the remote router; without it, the operation may time out even if standard ping succeeds.
Why this is correct
IP SLA ICMP echo uses a specific protocol format that differs from standard ping; the responder is needed for proper operation.
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 IP SLA operation is blocked by an ACL on the local router that permits ICMP but denies IP SLA packets.
Why it's wrong here
IP SLA ICMP echo uses ICMP type 8, same as ping, so ACLs permitting ping would also permit IP SLA.
- ✗
The IP SLA operation has a frequency that is too high, causing the router to rate-limit the probes.
Why it's wrong here
Rate-limiting is not the default behavior; frequency alone does not cause timeouts.
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 300-410 NAT questions on configuration and troubleshooting.
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FAQ
Questions learners often ask
What does this 300-410 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 ICMP echo operation requires the IP SLA responder to be enabled on the remote router; without it, the operation may time out even if standard ping succeeds. — IP SLA ICMP echo operations require the IP SLA responder to be enabled on the remote device for accurate round-trip time measurement; without it, the operation may still work but can time out due to packet processing differences, or the operation may fail entirely if the remote device does not respond to ICMP echo requests in a timely manner as per IP SLA expectations.
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.
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 19, 2026
This 300-410 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 300-410 exam.
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