- A
A source IP address is missing; the router will use the outgoing interface IP.
Without source-ip, the router defaults to the interface IP used for the route to the destination.
- B
The frequency is too low; it should be at least 60 seconds.
Why wrong: Frequency can be as low as 1 second.
- C
The destination IP is invalid; it must be a multicast address.
Why wrong: Destination can be any unicast IP.
- D
The operation type is wrong; it should be udp-echo.
Why wrong: icmp-echo is valid.
Question 1,654 of 2,152
IP SLA Configuration: The Importance of Source IP
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 R3:
ip sla 30
icmp-echo 192.168.2.1 frequency 5
ip sla schedule 30 life forever start-time now
What is missing from this configuration?
Quick Answer
The answer is that the IP SLA configuration is missing a source IP address. Without the source-ip command under the icmp-echo configuration, the router defaults to using the IP address of the outgoing interface for the probe packets. This is critical because the path those packets take is determined by the routing table at the moment of transmission, not necessarily the specific path you intend to monitor. On the Cisco CCNP ENARSI 300-410 exam, this tests your understanding that while a source IP is optional, omitting it can lead to misleading results if the outgoing interface changes or if you need to track reachability from a specific loopback or management address. A common trap is assuming the configuration is complete because the destination is set and the schedule is active. Remember the memory tip: "No source, no control"—if you don't specify the source, you lose the ability to guarantee which path is being tested.
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
✓
A source IP address is missing; the router will use the outgoing interface IP.
The configuration lacks a source IP address. While optional, without a source-ip, the router uses the outgoing interface IP, which may not be desired for tracking specific paths.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
A source IP address is missing; the router will use the outgoing interface IP.
Why this is correct
Without source-ip, the router defaults to the interface IP used for the route to the destination.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The frequency is too low; it should be at least 60 seconds.
Why it's wrong here
Frequency can be as low as 1 second.
- ✗
The destination IP is invalid; it must be a multicast address.
Why it's wrong here
Destination can be any unicast IP.
- ✗
The operation type is wrong; it should be udp-echo.
Why it's wrong here
icmp-echo is valid.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- Read the scenario before looking for a memorised answer.
- Find the constraint that changes the correct option.
- Eliminate answers that are true in general but not in this case.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the 300-410 exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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FAQ
Questions learners often ask
What does this 300-410 question test?
IP SLA — This question tests IP SLA — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A source IP address is missing; the router will use the outgoing interface IP. — The configuration lacks a source IP address. While optional, without a source-ip, the router uses the outgoing interface IP, which may not be desired for tracking specific paths.
What should I do if I get this 300-410 question wrong?
Identify which 300-410 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Same concept, more angles
3 more ways this is tested on 300-410
These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. Examine this IP SLA configuration on router R5: ip sla 50 icmp-echo 10.20.20.1 source-ip 192.168.10.1 frequency 10 ip sla schedule 50 life forever start-time now What is the effect of this configuration?
medium- ✓ A.It will continuously monitor reachability to 10.20.20.1 from source 192.168.10.1.
- B.It will stop after 10 successful replies.
- C.It will measure jitter between the two IPs.
- D.It will only work if 10.20.20.1 is directly connected.
Why A: The configuration creates an IP SLA operation that sends ICMP echo probes to 10.20.20.1 every 10 seconds, using source IP 192.168.10.1. It starts immediately and runs forever.
Variation 2. Given the following partial configuration on router R1: ip sla 10 icmp-echo 192.168.1.1 source-ip 10.0.0.1 frequency 10 ip sla schedule 10 life forever start-time now Which statement best describes the effect of this configuration?
medium- ✓ A.It sends ICMP echo requests from 10.0.0.1 to 192.168.1.1 every 10 seconds.
- B.It sends ICMP echo requests from 192.168.1.1 to 10.0.0.1 every 10 seconds.
- C.It sends ICMP echo requests every 10 seconds but only after the first successful reply.
- D.It sends ICMP echo requests only once and then stops.
Why A: The configuration creates an IP SLA operation that sends ICMP echo probes to 192.168.1.1 every 10 seconds, using source IP 10.0.0.1. The schedule starts immediately and runs indefinitely.
Variation 3. Given this IP SLA configuration on router R4: ip sla 40 icmp-echo 10.10.10.1 source-ip 172.16.1.1 frequency 15 ip sla schedule 40 life forever start-time now Which statement is true?
medium- ✓ A.The source IP 172.16.1.1 must be configured on an interface of R4.
- B.The source IP 172.16.1.1 can be any IP address, even if not local.
- C.The operation will fail because frequency 15 is too high.
- D.The operation will use TCP instead of ICMP.
Why A: The configuration sends ICMP echo probes from 172.16.1.1 to 10.10.10.1 every 15 seconds. The source IP is explicitly set.
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Last reviewed: Jun 19, 2026
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