mediumMultiple Choice
300-410 Practice Question: Consider this IP SLA configuration on router R6:…
Consider this IP SLA configuration on router R6:
ip sla 60
udp-echo 203.0.113.1 2000 source-ip 198.51.100.1 frequency 20
ip sla schedule 60 life forever start-time now
What is the purpose of this configuration?
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
✓
It tests UDP connectivity by sending a UDP packet and expecting a response.
The configuration sends UDP packets to destination 203.0.113.1 on port 2000, sourced from 198.51.100.1, every 20 seconds. It tests UDP connectivity and response time.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
It tests UDP connectivity by sending a UDP packet and expecting a response.
Why this is correct
The udp-echo operation sends a UDP probe to 203.0.113.1 port 2000 from source 198.51.100.1 and measures whether a reply returns, testing round-trip UDP reachability. Frequency 20 and life forever schedule it repeatedly, matching the stem's connectivity-testing purpose.
- ✗
It tests ICMP echo instead of UDP.
Why it's wrong here
The udp-echo operation sends UDP probes to port 2000; it never generates ICMP echo requests, so ICMP reachability is not measured. ICMP echo is a separate IP SLA operation type, useful when you need basic round-trip latency to a host that only answers pings.
- ✗
It measures jitter and packet loss.
Why it's wrong here
UDP jitter requires the udp-jitter operation type, which timestamps successive packets to compute inter-packet delay variation; udp-echo only confirms round-trip reachability and response time. Choose udp-jitter when the requirement is voice or video quality measurement across a path.
- ✗
It will only work if the destination is a Cisco router.
Why it's wrong here
The udp-echo operation sends UDP packets to any host that echoes them; the destination need not be Cisco or run IP SLA responder, since the target application itself returns the packet. This option would hold for icmp-echo or jitter probes requiring a responder.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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