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Ensure solution and operations reliability →hardMultiple 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

gcloud container clusters describe prod-cluster --zone=us-central1-a
...
nodePools:
- config:
    machineType: n1-standard-4
    oauthScopes:
    - https://www.googleapis.com/auth/devstorage.read_only
    - https://www.googleapis.com/auth/logging.write
    - https://www.googleapis.com/auth/monitoring
  initialNodeCount: 3
  management:
    autoRepair: true
    autoUpgrade: true
...
addonsConfig:
  networkPolicyConfig:
    disabled: false
...
networkPolicy:
  enabled: true
  provider: CALICO
...
  subnetwork: default

Refer to the exhibit. A GKE cluster named 'prod-cluster' has network policy enabled with Calico. A deployment in the cluster uses a ServiceAccount that needs to pull images from a private Container Registry in the same project. Despite correct configuration of ImagePullSecrets, pods fail to pull images with 'AccessDenied' errors. 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.

Exhibit

gcloud container clusters describe prod-cluster --zone=us-central1-a
...
nodePools:
- config:
    machineType: n1-standard-4
    oauthScopes:
    - https://www.googleapis.com/auth/devstorage.read_only
    - https://www.googleapis.com/auth/logging.write
    - https://www.googleapis.com/auth/monitoring
  initialNodeCount: 3
  management:
    autoRepair: true
    autoUpgrade: true
...
addonsConfig:
  networkPolicyConfig:
    disabled: false
...
networkPolicy:
  enabled: true
  provider: CALICO
...
  subnetwork: default

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 node service account lacks storage.objectViewer role on the registry bucket.

The correct answer is D because the node's service account (the GCE default service account or the one assigned to the cluster nodes) must have the `storage.objectViewer` role on the Container Registry's underlying Cloud Storage bucket. Even with correct ImagePullSecrets, the kubelet on each node uses the node's service account to authenticate with the registry when pulling images. Without this role, the node cannot read the image layers from the bucket, resulting in 'AccessDenied' errors.

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 ImagePullSecret is not correctly base64-encoded.

    Why it's wrong here

    The error is AccessDenied, not Unauthorized or ImagePullSecret errors. If the secret were malformed, the error would typically be different.

  • ✗

    The network policy blocks egress traffic to the Container Registry's endpoints.

    Why it's wrong here

    Network policies in GKE are ingress- or egress-based; by default, if no egress policy is defined, all egress is allowed. The error is AccessDenied, not network timeout.

  • ✗

    The cluster's private cluster feature prevents access to external registries.

    Why it's wrong here

    The exhibit does not indicate a private cluster; even if it were, private clusters can still pull images from external registries via Cloud NAT or VPC peering.

  • ✓

    The node service account lacks storage.objectViewer role on the registry bucket.

    Why this is correct

    The node's OAuth scopes include devstorage.read_only, but that only grants access to Storage objects if the service account has the necessary IAM permissions. The node's default service account may not have the required roles.

    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.

Common exam traps

Common exam trap: answer the scenario, not the keyword

Google often tests the distinction between pod-level authentication (ImagePullSecrets) and node-level authorization (IAM roles on the node's service account), leading candidates to focus on the pod's credentials while overlooking the node's permissions.

Detailed technical explanation

How to think about this question

Under the hood, GKE nodes use the Compute Engine default service account (or a custom one) to authenticate to Google Container Registry (gcr.io). The registry stores container images in Cloud Storage buckets, and the node's service account needs `storage.objectViewer` (roles/storage.objectViewer) on the project's registry bucket. This is distinct from the pod's ImagePullSecret, which authenticates the pod to the registry; the node's service account handles the actual download of image layers. In multi-project setups, the node's service account must be granted access to the registry's bucket in the project where the registry resides.

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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.

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 node service account lacks storage.objectViewer role on the registry bucket. — The correct answer is D because the node's service account (the GCE default service account or the one assigned to the cluster nodes) must have the `storage.objectViewer` role on the Container Registry's underlying Cloud Storage bucket. Even with correct ImagePullSecrets, the kubelet on each node uses the node's service account to authenticate with the registry when pulling images. Without this role, the node cannot read the image layers from the bucket, resulting in 'AccessDenied' errors.

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: Jul 4, 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.