- A
The IP SLA responder must be enabled on the destination device for UDP jitter probes to function correctly.
Correct because UDP jitter probes require the responder on the destination to timestamp packets and calculate delay, jitter, and packet loss.
- B
The 'ip sla responder' command is entered in global configuration mode to enable the responder globally.
Correct because this command enables the IP SLA responder globally on the device, allowing it to respond to IP SLA control messages.
- C
The IP SLA responder must be enabled on every intermediate router along the path for accurate one-way delay measurements.
Why wrong: Incorrect because the responder is only needed on the destination device; intermediate routers do not participate in IP SLA probing.
- D
ICMP echo probes require the IP SLA responder to be enabled on the target device.
Why wrong: Incorrect because ICMP echo probes use standard ICMP echo requests and replies, which do not require the IP SLA responder.
- E
The IP SLA responder can be configured to respond only to specific source IP addresses using an access list.
Why wrong: Incorrect because the responder can be restricted using an access list applied to the 'ip sla responder' command, making this statement partially correct, but the responder itself does not inherently filter by source; the access list is an optional enhancement.
Quick Answer
The correct answer is that the 'ip sla responder' command is entered in global configuration mode to enable the responder globally, and it can be refined with an access list to restrict which source IPs can trigger it. This is because the IP SLA responder is a software component on the destination device that actively timestamps and echoes test packets, ensuring precise one-way and round-trip delay measurements for UDP-based probes like UDP jitter or UDP echo. On the ENCOR 350-401 exam, this concept tests your understanding that the responder is not needed for ICMP echo probes, nor does it require SNMP or a control protocol—it is a simple, targeted feature. A common trap is assuming the responder must be enabled on every hop in the path, but it is only required on the destination device. Remember the memory tip: “Responder on the receiver, not on the router in the middle.”
CCNP IP SLA Practice Question
This 350-401 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.
Which two statements about IP SLA responder configuration are true? (Choose two.)
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 responder must be enabled on the destination device for UDP jitter probes to function correctly.
The IP SLA responder is required for certain probe types to ensure accurate measurements. The 'ip sla responder' command enables the responder globally, and it can be further refined with an access list to limit which source IPs are allowed to trigger the responder. The responder does not need to be enabled on every device in the path, only on the destination device for UDP-based probes. The responder is not used for ICMP echo probes, and it does not require a control protocol like SNMP to function.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 responder must be enabled on the destination device for UDP jitter probes to function correctly.
Why this is correct
Correct because UDP jitter probes require the responder on the destination to timestamp packets and calculate delay, jitter, and packet loss.
Related concept
Authentication checks who the user is.
- ✓
The 'ip sla responder' command is entered in global configuration mode to enable the responder globally.
Why this is correct
Correct because this command enables the IP SLA responder globally on the device, allowing it to respond to IP SLA control messages.
Related concept
Authentication checks who the user is.
- ✗
The IP SLA responder must be enabled on every intermediate router along the path for accurate one-way delay measurements.
Why it's wrong here
Incorrect because the responder is only needed on the destination device; intermediate routers do not participate in IP SLA probing.
- ✗
ICMP echo probes require the IP SLA responder to be enabled on the target device.
Why it's wrong here
Incorrect because ICMP echo probes use standard ICMP echo requests and replies, which do not require the IP SLA responder.
- ✗
The IP SLA responder can be configured to respond only to specific source IP addresses using an access list.
Why it's wrong here
Incorrect because the responder can be restricted using an access list applied to the 'ip sla responder' command, making this statement partially correct, but the responder itself does not inherently filter by source; the access list is an optional enhancement.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Trap categories for this question
Command / output trap
Incorrect because the responder can be restricted using an access list applied to the 'ip sla responder' command, making this statement partially correct, but the responder itself does not inherently filter by source; the access list is an optional enhancement.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
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FAQ
Questions learners often ask
What does this 350-401 question test?
IP SLA — This question tests IP SLA — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: The IP SLA responder must be enabled on the destination device for UDP jitter probes to function correctly. — The IP SLA responder is required for certain probe types to ensure accurate measurements. The 'ip sla responder' command enables the responder globally, and it can be further refined with an access list to limit which source IPs are allowed to trigger the responder. The responder does not need to be enabled on every device in the path, only on the destination device for UDP-based probes. The responder is not used for ICMP echo probes, and it does not require a control protocol like SNMP to function.
What should I do if I get this 350-401 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related 350-401 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Last reviewed: Jun 18, 2026
This 350-401 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 350-401 exam.
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