Question 239 of 2,011
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300-410 Practice Question: Which TWO statements about IP SLA responder…
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.
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.
- ✓
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.
- ✗
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.
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Last reviewed: Jun 19, 2026
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