350-401 · Question #249
Which IP SLA operation type is enhanced by the use of the IP SLAs Responder?
The correct answer is D. UDP Echo. The IP SLAs Responder enhances UDP Echo operations by allowing the target device to timestamp packets at the receive and send times for more accurate round-trip time measurements.
Question
Options
- ADNS
- BHTTP
- CICMP Echo
- DUDP Echo
How the community answered
(58 responses)- A7% (4)
- B2% (1)
- C5% (3)
- D86% (50)
Why each option
The IP SLAs Responder enhances UDP Echo operations by allowing the target device to timestamp packets at the receive and send times for more accurate round-trip time measurements.
DNS operations primarily test DNS resolution and are not directly enhanced by a responder for precise timestamping in the same manner as UDP Echo.
HTTP operations test web server reachability and response times, which are not directly enhanced by the IP SLAs Responder for timestamp accuracy.
ICMP Echo operations measure basic reachability and RTT, but the responder functionality specifically adds timestamping for UDP/TCP/RTP operations, not ICMP.
The IP SLAs Responder on the target device adds a timestamp at both the reception and transmission of the UDP Echo packet, providing more accurate round-trip time (RTT) measurements by eliminating processing delays on the target device.
Concept tested: IP SLA Responder functionality
Source: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla-cfg-op.html#GUID-0570C315-7B13-4024-8178-591C63B48F70
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