Which ip sla responder command configures the router as the destination for jitter measurements?
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Correct answer: Router(config)# ip sla responder udp-echo 172.29.139.134 5000.
Why this is the answer
The ip sla responder udp-echo command configures the router to act as an IP SLA responder for UDP echo operations. This is crucial for accurate jitter measurements because the responder timestamps received packets and sends them back, allowing the source device to calculate round-trip time, jitter, and packet loss. The udp-echo option specifically uses UDP, which is commonly employed for voice and video traffic where jitter is a critical metric. The udp-connect and tcp-connect options are used for connection-oriented tests, not direct echo responses for jitter. The tcp-echo option is not a valid command for IP SLA responders.
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