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Cloud Native Architecture →mediumMultiple 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: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        livenessProbe:
          httpGet:
            path: /healthz
            port: 80
          initialDelaySeconds: 5
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            port: 80
          initialDelaySeconds: 3
          periodSeconds: 5
```

The exhibit shows a Deployment manifest for a frontend service. After deployment, the pods are running but the service reports that no endpoints are available. 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 1mediummultiple choice
Full question →

Exhibit

Refer to the exhibit.
```
apiVersion: apps/v1
kind: Deployment
metadata:
  name: frontend
spec:
  replicas: 3
  selector:
    matchLabels:
      app: frontend
  template:
    metadata:
      labels:
        app: frontend
    spec:
      containers:
      - name: nginx
        image: nginx:1.21
        ports:
        - containerPort: 80
        livenessProbe:
          httpGet:
            path: /healthz
            port: 80
          initialDelaySeconds: 5
          periodSeconds: 10
        readinessProbe:
          httpGet:
            path: /ready
            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 readiness probe is checking /ready which is not returning a 200 OK response.

The service reports no endpoints because the readiness probe is failing. A readiness probe determines whether a pod should receive traffic; if it does not return a 200 OK on the configured path (/ready), the pod is removed from the service’s endpoint list. Since the pods are running (liveness probe passes), the most likely cause is that the /ready endpoint is not serving a successful response.

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 readiness probe periodSeconds is too short, causing the probe to overload the container.

    Why it's wrong here

    Probe frequency doesn't cause endpoint unavailability; the probe must fail to remove endpoints.

  • ✓

    The readiness probe is checking /ready which is not returning a 200 OK response.

    Why this is correct

    If the readiness probe fails, the pod is not considered ready and is removed from service endpoints.

    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 container image nginx:1.21 does not have the /healthz endpoint.

    Why it's wrong here

    Liveness probe is not failing; the issue is with readiness.

  • ✗

    The liveness probe is failing, causing the pod to be restarted.

    Why it's wrong here

    A failing liveness probe restarts the pod, but the pod would still be in Running state if readiness passes.

Common exam traps

Common exam trap: answer the scenario, not the keyword

CNCF often tests the distinction between readiness and liveness probes: candidates confuse a failing liveness probe (which restarts pods) with a failing readiness probe (which removes traffic but keeps the pod running).

Detailed technical explanation

How to think about this question

Kubernetes readiness probes use HTTP GET requests to the specified path; if the container’s web server (e.g., nginx) does not have a handler for /ready that returns 200, the probe fails. The kubelet updates the pod’s Ready condition to False, and the endpoint controller removes the pod’s IP from the service’s Endpoints object. This is a common misconfiguration when developers assume a default endpoint exists without verifying the application’s response.

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?

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 readiness probe is checking /ready which is not returning a 200 OK response. — The service reports no endpoints because the readiness probe is failing. A readiness probe determines whether a pod should receive traffic; if it does not return a 200 OK on the configured path (/ready), the pod is removed from the service’s endpoint list. Since the pods are running (liveness probe passes), the most likely cause is that the /ready endpoint is not serving a successful response.

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.

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Last reviewed: Jun 30, 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.