Courseiva
← KCNA
Full test
Question 575 of 997
Cloud Native Architecture →hardMultiple ChoiceObjective-mapped

KCNA Cloud Native Architecture Practice Question

This KCNA practice question tests your understanding of cloud native architecture. 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.

Exhibit

Refer to the exhibit.
```
apiVersion: v1
kind: Pod
metadata:
  name: web-app
spec:
  containers:
  - name: app
    image: nginx:latest
    ports:
    - containerPort: 80
    livenessProbe:
      httpGet:
        path: /healthz
        port: 8080
      initialDelaySeconds: 3
      periodSeconds: 5
```

A developer creates the Pod manifest shown. When the Pod runs, the liveness probe fails and the container is restarted repeatedly. What is the most likely cause?

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.

Question 1hardmultiple choice
Full question →

Exhibit

Refer to the exhibit.
```
apiVersion: v1
kind: Pod
metadata:
  name: web-app
spec:
  containers:
  - name: app
    image: nginx:latest
    ports:
    - containerPort: 80
    livenessProbe:
      httpGet:
        path: /healthz
        port: 8080
      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 port (8080) does not match the container port (80).

The liveness probe is configured to check TCP on port 8080, but the container exposes port 80 for Nginx. Since the probe will never successfully connect to port 8080, it always fails, causing the container to be restarted repeatedly. The probe must target the same port that the application is listening on.

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 liveness probe port (8080) does not match the container port (80).

    Why this is correct

    Correct. The probe checks port 8080, but Nginx listens on port 80, so the probe fails.

    Clue confirmation

    The clue word "most likely" in the question point toward this answer.

    Related concept

    Read the scenario before looking for a memorised answer.

  • ✗

    The initialDelaySeconds of 3 is too short for Nginx to start.

    Why it's wrong here

    Nginx typically starts in under a second, so 3 seconds is usually sufficient.

  • ✗

    The periodSeconds of 5 causes too frequent probing.

    Why it's wrong here

    Too frequent probing might cause unnecessary load but not probe failures; the probe would still succeed if the endpoint were reachable.

  • ✗

    The image nginx:latest does not have a /healthz endpoint.

    Why it's wrong here

    While true, the main issue is the port mismatch; the probe is checking the wrong port.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CNCF often tests the distinction between TCP and HTTP probes, and the trap here is that candidates assume a TCP probe can target any port without matching the container's listening port, or they confuse the probe port with the container port defined in the Pod spec.

Detailed technical explanation

How to think about this question

A TCP liveness probe works by attempting to open a socket connection to the specified port; if the connection succeeds, the probe is considered healthy. In this case, the probe targets port 8080, but Nginx listens on port 80, so the connection is refused (or times out), causing the probe to fail. Under the hood, kubelet uses the container's network namespace to perform the check, so port mismatches are a common misconfiguration that leads to crash loops.

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.

Related practice questions

Related KCNA practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Kubernetes Fundamentals practice questions

Practise KCNA questions linked to Kubernetes Fundamentals.

Container Orchestration practice questions

Practise KCNA questions linked to Container Orchestration.

Cloud Native Architecture practice questions

Practise KCNA questions linked to Cloud Native Architecture.

Cloud Native Observability practice questions

Practise KCNA questions linked to Cloud Native Observability.

Cloud Native Application Delivery practice questions

Practise KCNA questions linked to Cloud Native Application Delivery.

KCNA fundamentals practice questions

Practise KCNA questions linked to KCNA fundamentals.

KCNA scenario practice questions

Practise KCNA questions linked to KCNA scenario.

KCNA troubleshooting practice questions

Practise KCNA questions linked to KCNA troubleshooting.

Practice this exam

Start a free KCNA practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions20 questions30 questions50 questionsTimed 30
KCNA practice-test guide →Study guide →Browse all practice tests

FAQ

Questions learners often ask

What does this KCNA question test?

Cloud Native Architecture — This question tests Cloud Native Architecture — Read the scenario before looking for a memorised answer..

What is the correct answer to this question?

The correct answer is: The liveness probe port (8080) does not match the container port (80). — The liveness probe is configured to check TCP on port 8080, but the container exposes port 80 for Nginx. Since the probe will never successfully connect to port 8080, it always fails, causing the container to be restarted repeatedly. The probe must target the same port that the application is listening on.

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". 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.

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 →

How Courseiva writes practice questions · Editorial policy

Last reviewed: Jun 30, 2026

Question Discussion

Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.

Loading comments…

Sign in to join the discussion.

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.