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Kubernetes Fundamentals →hardMultiple ChoiceObjective-mapped

KCNA Kubernetes Fundamentals Practice Question

This KCNA practice question tests your understanding of kubernetes fundamentals. 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.

Exhibit

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
  - name: nginx
    image: nginx:latest
    ports:
    - containerPort: 80
    livenessProbe:
      httpGet:
        path: /healthz
        port: 80
      initialDelaySeconds: 5
      periodSeconds: 10
    readinessProbe:
      httpGet:
        path: /
        port: 80
      initialDelaySeconds: 3
      periodSeconds: 5

Refer to the exhibit. The nginx Pod is created, but the Pod never becomes Ready. The container starts and runs. What is the most likely reason?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "most likely"

    Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

  • Clue: "never"

    Why it matters: Absolute qualifier. True only if the statement has zero exceptions — be cautious of options that seem obvious but break down in edge cases.

Question 1hardmultiple choice
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Exhibit

apiVersion: v1
kind: Pod
metadata:
  name: nginx-pod
spec:
  containers:
  - name: nginx
    image: nginx:latest
    ports:
    - containerPort: 80
    livenessProbe:
      httpGet:
        path: /healthz
        port: 80
      initialDelaySeconds: 5
      periodSeconds: 10
    readinessProbe:
      httpGet:
        path: /
        port: 80
      initialDelaySeconds: 3
      periodSeconds: 5

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

✓

The liveness probe is failing because /healthz endpoint does not exist, causing the container to restart.

The liveness probe is configured to check the /healthz endpoint, but the default nginx container does not serve a /healthz endpoint. This causes the liveness probe to fail, and Kubernetes restarts the container according to the probe's failure threshold. Since the container keeps restarting, it never reaches the Ready state, even though the container starts and runs initially.

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 nginx:latest image does not exist.

    Why it's wrong here

    nginx:latest is a valid public image.

  • ✗

    The containerPort is not matching the actual port nginx listens on.

    Why it's wrong here

    containerPort is informational; nginx defaults to 80, so it matches.

  • ✓

    The liveness probe is failing because /healthz endpoint does not exist, causing the container to restart.

    Why this is correct

    The liveness probe expects /healthz to return 200, but nginx does not serve that path by default, so the probe fails and the container is restarted. This prevents the readiness probe from ever succeeding.

    Clue confirmation

    The clue words "most likely", "never" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The readiness probe is failing because the root path is not returning 200.

    Why it's wrong here

    The root path typically returns 200 from nginx, so readiness should pass.

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 assume a failing liveness probe only affects health checks, not the Pod's Ready status, when in fact repeated restarts prevent the Pod from ever becoming Ready.

Detailed technical explanation

How to think about this question

Kubernetes probes (liveness, readiness, startup) use HTTP GET requests to the specified path and port. If the endpoint returns a non-2xx status or fails to respond within the timeout, the probe is marked as failed. The liveness probe's failure triggers a container restart, which resets the container's state and prevents the Pod from becoming Ready. In contrast, a readiness probe failure would keep the Pod from receiving traffic but would not restart the container. The default nginx image serves a 200 on / but has no /healthz endpoint, so the liveness probe fails repeatedly.

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 small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.

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.

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FAQ

Questions learners often ask

What does this KCNA question test?

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 liveness probe is failing because /healthz endpoint does not exist, causing the container to restart. — The liveness probe is configured to check the /healthz endpoint, but the default nginx container does not serve a /healthz endpoint. This causes the liveness probe to fail, and Kubernetes restarts the container according to the probe's failure threshold. Since the container keeps restarting, it never reaches the Ready state, even though the container starts and runs initially.

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.

Are there clue words in this question I should notice?

Yes — watch for: "most likely", "never". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.

What is the key concept behind this question?

Read the scenario before looking for a memorised answer.

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Last reviewed: Jun 11, 2026

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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.