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Ensure solution and operations reliability →mediumMultiple ChoiceObjective-mapped

Google PCA Ensure solution and operations reliability Practice Question

This PCA practice question tests your understanding of ensure solution and operations reliability. 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

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: gcr.io/my-project/my-app:latest
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /healthz
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          tcpSocket:
            port: 8080
          initialDelaySeconds: 15
          periodSeconds: 20

After deploying the above configuration, the application is not receiving traffic from the Kubernetes Service. The Service is correctly configured to target port 8080. What is the most likely issue?

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

apiVersion: apps/v1
kind: Deployment
metadata:
  name: my-app
spec:
  replicas: 3
  selector:
    matchLabels:
      app: my-app
  template:
    metadata:
      labels:
        app: my-app
    spec:
      containers:
      - name: my-container
        image: gcr.io/my-project/my-app:latest
        ports:
        - containerPort: 8080
        readinessProbe:
          httpGet:
            path: /healthz
            port: 8080
          initialDelaySeconds: 5
          periodSeconds: 10
        livenessProbe:
          tcpSocket:
            port: 8080
          initialDelaySeconds: 15
          periodSeconds: 20

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 using HTTP but the container may not be ready on that path; change to TCP.

Option C is correct because the readiness probe is configured as an HTTP GET request, but the application container may not be serving traffic on the specified HTTP path at startup. If the application listens on a TCP port but does not respond to HTTP GET on that path, the readiness probe will fail, causing the Service to not route traffic to the Pod. Changing the readiness probe to a TCP socket check ensures the probe only verifies that the port is open, which is more reliable when the application does not expose an HTTP endpoint for health checks.

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 initialDelaySeconds for readiness probe is too short; increase it.

    Why it's wrong here

    Delay might be fine; not the most likely cause.

  • ✗

    The port name is not defined; add a name to the container port.

    Why it's wrong here

    Port names are optional for service targeting.

  • ✓

    The readiness probe is using HTTP but the container may not be ready on that path; change to TCP.

    Why this is correct

    If /healthz is not served, the probe fails and pod is not ready.

    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 image pull policy is not set to Always; new pods may use stale image.

    Why it's wrong here

    Image pull policy is not related to readiness probe failure.

  • ✗

    The liveness probe uses tcpSocket; it should be HTTPGet.

    Why it's wrong here

    TCP socket probe is valid for liveness.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google Cloud often tests the distinction between readiness and liveness probes, and the trap here is that candidates confuse a failing readiness probe with a liveness probe issue, or assume that any HTTP probe is better than TCP without considering the application's actual behavior.

Detailed technical explanation

How to think about this question

Kubernetes readiness probes determine whether a Pod should receive traffic from a Service. An HTTP GET readiness probe requires the container to respond with a 2xx or 3xx status code on the specified path; if the application does not have an HTTP handler at that path, the probe fails and the Pod is marked as not ready. A TCP socket probe only checks that the port is open, which is more suitable for applications that accept TCP connections but do not serve HTTP. In real-world scenarios, misconfigured readiness probes are a common cause of zero traffic to newly deployed Pods, especially when migrating from TCP-based to HTTP-based health checks.

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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.

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 PCA question test?

Ensure solution and operations reliability — This question tests Ensure solution and operations reliability — 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 using HTTP but the container may not be ready on that path; change to TCP. — Option C is correct because the readiness probe is configured as an HTTP GET request, but the application container may not be serving traffic on the specified HTTP path at startup. If the application listens on a TCP port but does not respond to HTTP GET on that path, the readiness probe will fail, causing the Service to not route traffic to the Pod. Changing the readiness probe to a TCP socket check ensures the probe only verifies that the port is open, which is more reliable when the application does not expose an HTTP endpoint for health checks.

What should I do if I get this PCA 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 PCA practice question is part of Courseiva's free Google Cloud 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 PCA exam.