- A
Liveness probe checks if the container is ready to serve traffic
Why wrong: That is the purpose of a readiness probe.
- B
Readiness probe indicates if the container is healthy; liveness indicates if it should be restarted
Why wrong: The opposite: liveness indicates health, readiness indicates traffic readiness.
- C
Liveness probe indicates if the container is alive; if it fails, the container is restarted
Liveness probes restart unhealthy containers; readiness probes control traffic routing.
- D
Both probes serve the same purpose but with different endpoints
Why wrong: They have distinct purposes.
Question 939 of 997
Liveness Probe vs Readiness Probe: Kubernetes Health Checks
This KCNA practice question tests your understanding of container orchestration. 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.
What is the difference between a liveness probe and a readiness probe?
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
✓
Liveness probe indicates if the container is alive; if it fails, the container is restarted
Option C is correct because a liveness probe determines if a container is still running (alive). If the liveness probe fails, Kubernetes restarts the container based on the `restartPolicy`. This is distinct from a readiness probe, which checks if a container is ready to accept traffic and removes it from Service endpoints if it fails.
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.
- ✗
Liveness probe checks if the container is ready to serve traffic
Why it's wrong here
That is the purpose of a readiness probe.
- ✗
Readiness probe indicates if the container is healthy; liveness indicates if it should be restarted
Why it's wrong here
The opposite: liveness indicates health, readiness indicates traffic readiness.
- ✓
Liveness probe indicates if the container is alive; if it fails, the container is restarted
Why this is correct
Liveness probes restart unhealthy containers; readiness probes control traffic routing.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Both probes serve the same purpose but with different endpoints
Why it's wrong here
They have distinct purposes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse the purpose of liveness and readiness probes, often thinking liveness controls traffic routing or that readiness triggers restarts, when in fact liveness governs restarts and readiness governs traffic inclusion.
Detailed technical explanation
How to think about this question
Under the hood, liveness and readiness probes can be implemented via HTTP GET requests, TCP socket checks, or command execution (`exec`). A common subtlety is that a failing liveness probe triggers a container restart, while a failing readiness probe only removes the Pod from Service endpoints, which is critical for graceful shutdowns during rolling updates. In real-world scenarios, setting a liveness probe too aggressively can cause unnecessary restarts during transient failures, while omitting a readiness probe can route traffic to a container that is still initializing.
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.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Container Orchestration — study guide chapter
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FAQ
Questions learners often ask
What does this KCNA question test?
Container Orchestration — This question tests Container Orchestration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Liveness probe indicates if the container is alive; if it fails, the container is restarted — Option C is correct because a liveness probe determines if a container is still running (alive). If the liveness probe fails, Kubernetes restarts the container based on the `restartPolicy`. This is distinct from a readiness probe, which checks if a container is ready to accept traffic and removes it from Service endpoints if it fails.
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.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
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Last reviewed: Jul 4, 2026
This KCNA practice question is part of Courseiva's free CNCF 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 KCNA exam.
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