Question 239 of 2,152

IP SLA →hardMultiple SelectObjective-mapped

IP SLA Responder Configuration

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.)

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.

Full breakdown with real-world context →

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."

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: 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.

✓
The 'ip sla responder' command must be configured on the destination device for UDP jitter probes to obtain accurate round-trip time.
Why this is correct
Correct. UDP jitter probes require the responder to timestamp the packets for accurate delay and jitter calculations.
Related concept
Read the scenario before looking for a memorised answer.
✓
The responder can be configured to listen on a specific UDP port using the 'ip sla responder udp-echo' command.
Why this is correct
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.
Related concept
Read the scenario before looking for a memorised answer.
✗
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: 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.

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

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: 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?

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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