This KCNA practice question tests your understanding of kubernetes fundamentals. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 THREE of the following are required for a Kubernetes pod to be considered healthy and ready to serve traffic?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The startup probe has succeeded.
Option A is correct because a startup probe must succeed before the kubelet considers the container started. Until the startup probe succeeds, the readiness and liveness probes are not active, so the pod cannot be marked healthy or ready. This is defined in the Kubernetes API for startup probes, which delay the start of other probes until the application has initialized.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding 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 startup probe has succeeded.
Why this is correct
Startup probe indicates the application has started.
Related concept
Read the scenario before looking for a memorised answer.
✓
The container is in the Running state.
Why this is correct
Container must be running to be ready.
Related concept
Read the scenario before looking for a memorised answer.
✗
The pod has at least one endpoint in its Service's endpoints list.
Why it's wrong here
Endpoints are added after readiness, not a requirement for readiness.
✓
The readiness probe has succeeded.
Why this is correct
Readiness probe indicates readiness to serve traffic.
Related concept
Read the scenario before looking for a memorised answer.
✗
The liveness probe has succeeded.
Why it's wrong here
Liveness probe determines if container is alive, not ready.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the distinction between liveness and readiness probes, and the trap here is that candidates confuse a successful liveness probe (which only indicates the container is alive) with the readiness probe (which specifically controls traffic routing), leading them to incorrectly select option E.
Detailed technical explanation
How to think about this question
Under the hood, the kubelet runs startup, readiness, and liveness probes as defined in the pod spec. The startup probe is typically used for slow-starting containers, and until it succeeds, the kubelet sets the container's status to not started, preventing readiness and liveness probes from executing. Once the startup probe succeeds, the readiness probe determines if the pod is added to Service endpoints by updating the EndpointSlice object. In real-world scenarios, a misconfigured readiness probe can cause traffic loss even if the application is healthy, while a liveness probe failure triggers a restart but does not immediately remove the pod from service if the readiness probe still passes.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the KCNA 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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this KCNA question in full detail.
Kubernetes Fundamentals — This question tests Kubernetes Fundamentals — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The startup probe has succeeded. — Option A is correct because a startup probe must succeed before the kubelet considers the container started. Until the startup probe succeeds, the readiness and liveness probes are not active, so the pod cannot be marked healthy or ready. This is defined in the Kubernetes API for startup probes, which delay the start of other probes until the application has initialized.
What should I do if I get this KCNA question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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