- A
The Cloud Build service account does not have permissions to authenticate to Artifact Registry when using a private pool.
Why wrong: The service account has artifactregistry.writer, which should grant push access. The error is not due to IAM.
- B
The VPC-SC perimeter does not allow egress to the Artifact Registry API endpoint.
VPC-SC can restrict access to APIs; the Artifact Registry endpoint must be explicitly allowed in the perimeter.
- C
The Docker push is failing because the image tag is missing a version.
Why wrong: The image name includes a tag (myimage), so no version is missing.
- D
The Artifact Registry repository is in a different region than the Cloud Build worker pool.
Why wrong: Private pools can access Artifact Registry in any region; region mismatch does not cause this error.
PCDOE Building and implementing CI/CD pipelines Practice Question
This PCDOE practice question tests your understanding of building and implementing ci/cd pipelines. 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.
A financial services firm is implementing a CI/CD pipeline with Cloud Build and Artifact Registry. Their security policy requires all data to remain within a VPC Service Controls perimeter. They have configured Cloud Build to use a private worker pool with no external IP addresses and have set up VPC-SC to allow traffic between Cloud Build and Artifact Registry within the perimeter. However, builds that push Docker images to Artifact Registry fail with the error: 'denied: Unauthenticated request. Push access to the repository is denied.' The build configuration includes the step: 'steps: - name: gcr.io/cloud-builders/docker args: [push, us-central1-docker.pkg.dev/myproject/my-repo/myimage]' The Cloud Build service account has been granted roles/artifactregistry.writer on the repository. 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.
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 VPC-SC perimeter does not allow egress to the Artifact Registry API endpoint.
Option C is correct because VPC Service Controls can block access to Artifact Registry API endpoints if they are not in the allowed list, resulting in a denied error even with correct IAM permissions. Option A is incorrect because Artifact Registry is regional but private pools can access any region. Option B is incorrect because IAM permissions are correct. Option D is incorrect because the image tag is present.
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 Cloud Build service account does not have permissions to authenticate to Artifact Registry when using a private pool.
Why it's wrong here
The service account has artifactregistry.writer, which should grant push access. The error is not due to IAM.
- ✓
The VPC-SC perimeter does not allow egress to the Artifact Registry API endpoint.
Why this is correct
VPC-SC can restrict access to APIs; the Artifact Registry endpoint must be explicitly allowed in the perimeter.
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 Docker push is failing because the image tag is missing a version.
Why it's wrong here
The image name includes a tag (myimage), so no version is missing.
- ✗
The Artifact Registry repository is in a different region than the Cloud Build worker pool.
Why it's wrong here
Private pools can access Artifact Registry in any region; region mismatch does not cause this error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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Building and implementing CI/CD pipelines — study guide chapter
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Building and implementing CI/CD pipelines practice questions
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FAQ
Questions learners often ask
What does this PCDOE question test?
Building and implementing CI/CD pipelines — This question tests Building and implementing CI/CD pipelines — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The VPC-SC perimeter does not allow egress to the Artifact Registry API endpoint. — Option C is correct because VPC Service Controls can block access to Artifact Registry API endpoints if they are not in the allowed list, resulting in a denied error even with correct IAM permissions. Option A is incorrect because Artifact Registry is regional but private pools can access any region. Option B is incorrect because IAM permissions are correct. Option D is incorrect because the image tag is present.
What should I do if I get this PCDOE question wrong?
Identify which PCDOE exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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
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Last reviewed: Jun 24, 2026
This PCDOE 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 PCDOE exam.
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