- A
The 'ip sla responder' command must be configured on the destination device for UDP jitter probes to obtain accurate round-trip time.
Correct. UDP jitter probes require the responder to timestamp the packets for accurate delay and jitter calculations.
- B
The responder can be configured to listen on a specific UDP port using the 'ip sla responder udp-echo' command.
Correct. The 'ip sla responder udp-echo' command allows specifying a UDP port for the responder to listen on, which is used by UDP echo probes.
- C
The responder is automatically enabled on all Cisco routers running IOS 15.0 or later.
Why wrong: Incorrect. The responder must be explicitly enabled with the 'ip sla responder' command; it is not automatic.
- D
The ICMP echo probe type requires the responder to be configured on the destination for accurate results.
Why wrong: Incorrect. ICMP echo probes use the standard ICMP echo reply mechanism and do not require the IP SLA responder.
- E
The responder can provide hardware-based timestamping to improve accuracy when the 'timestamp' option is configured.
Why wrong: Incorrect. The responder uses software timestamps; hardware timestamping is not a feature of IP SLA responder.
Quick Answer
The correct answer is that the IP SLA responder can be configured to listen on a specific UDP port using the 'ip sla responder udp-echo' command. This is true because the responder acts as a dedicated endpoint on the destination device, actively listening for and replying to probe packets; for UDP-based probes like UDP jitter or UDP echo, you must specify the exact port to ensure the responder intercepts the traffic for accurate one-way delay and jitter measurements. On the Cisco CCNP ENARSI 300-410 exam, this concept tests your understanding of when the responder is mandatory—it is not needed for ICMP echo, but it is required for TCP connect and UDP jitter to avoid false timeouts. A common trap is assuming the responder automatically adjusts timestamps, but that only happens with the explicit 'timestamp' option. Memory tip: "Responder equals receiver—always set the port for UDP, never for ICMP."
300-410 IP SLA Practice Question
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.
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' command must be configured on the destination device for UDP jitter probes to obtain accurate round-trip time.
The IP SLA responder is a component that listens for probe requests and sends replies. It is required for certain probe types like UDP jitter and TCP connect to ensure accurate measurements. The responder must be enabled on the destination device with the 'ip sla responder' global command. It does not require a specific port for ICMP echo, and it does not automatically adjust timestamps without the 'timestamp' option.
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 responder' command must be configured on the destination device for UDP jitter probes to obtain accurate round-trip time.
- ✓
The responder can be configured to listen on a specific UDP port using the 'ip sla responder udp-echo' command.
- ✗
The responder is automatically enabled on all Cisco routers running IOS 15.0 or later.
Why it's wrong here
Incorrect. The responder must be explicitly enabled with the 'ip sla responder' command; it is not automatic.
- ✗
The ICMP echo probe type requires the responder to be configured on the destination for accurate results.
Why it's wrong here
Incorrect. ICMP echo probes use the standard ICMP echo reply mechanism and do not require the IP SLA responder.
- ✗
The responder can provide hardware-based timestamping to improve accuracy when the 'timestamp' option is configured.
Why it's wrong here
Incorrect. The responder uses software timestamps; hardware timestamping is not a feature of IP SLA responder.
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.
Trap categories for this question
Command / output trap
Incorrect. The responder must be explicitly enabled with the 'ip sla responder' command; it is not automatic.
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 responder' command must be configured on the destination device for UDP jitter probes to obtain accurate round-trip time. — The IP SLA responder is a component that listens for probe requests and sends replies. It is required for certain probe types like UDP jitter and TCP connect to ensure accurate measurements. The responder must be enabled on the destination device with the 'ip sla responder' global command. It does not require a specific port for ICMP echo, and it does not automatically adjust timestamps without the 'timestamp' option.
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.
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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