Quick Answer
The answer is UDP jitter. This IP SLA operation type requires an IP SLA responder to be configured on the target device because it relies on precise timestamping at both endpoints to measure one-way delay, jitter, and packet loss; the responder actively participates in the probe by returning specially marked packets, unlike simpler operations such as ICMP echo, which only need a standard ping reply. On the ENCOR 350-401 exam, this distinction tests your understanding of how Cisco IP SLA measures network performance, often appearing in questions about monitoring voice or video quality where jitter is critical. A common trap is assuming all IP SLA probes need a responder, but only those that require bidirectional, time-sensitive data exchange—like UDP jitter and TCP connect—do. To remember, think: “Jitter needs a partner; echo just bounces back.”
This 350-401 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 IP SLA operation type requires an IP SLA responder to be configured on the target device?
ICMP echo
Why wrong: ICMP echo uses standard ICMP and does not require a responder.
UDP jitter
UDP jitter requires an IP SLA responder to generate timestamps for accurate measurements.
TCP connect
Why wrong: TCP connect does not require a responder; it attempts a TCP connection.
HTTP get
Why wrong: HTTP get does not require a responder; it sends an HTTP request.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
UDP jitter
UDP jitter operations require a responder to accurately measure one-way delay, jitter, and packet loss. ICMP echo does not require a responder.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
ICMP echo
Why it's wrong here
ICMP echo uses standard ICMP and does not require a responder.
UDP jitter
Why this is correct
UDP jitter requires an IP SLA responder to generate timestamps for accurate measurements.
Related concept
Read the scenario before looking for a memorised answer.
TCP connect
Why it's wrong here
TCP connect does not require a responder; it attempts a TCP connection.
HTTP get
Why it's wrong here
HTTP get does not require a responder; it sends an HTTP request.
Common exam traps
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.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
A practitioner preparing for the 350-401 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
Identify which 350-401 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
IP SLA — This question tests IP SLA — Read the scenario before looking for a memorised answer..
The correct answer is: UDP jitter — UDP jitter operations require a responder to accurately measure one-way delay, jitter, and packet loss. ICMP echo does not require a responder.
Identify which 350-401 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.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 18, 2026
This 350-401 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 350-401 exam.
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