PCDOE Building and implementing CI/CD pipelines Practice Question
This PCDOE practice question tests your understanding of building and implementing ci/cd pipelines. 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.
A team uses Cloud Build with a trigger on Cloud Source Repository. The build fails intermittently with error 'Failed to pull builder image 'gcr.io/cloud-builders/gcloud'' but sometimes succeeds. 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.
The Cloud Build worker pool is in a different region.
Why wrong: Worker pool region does not affect pulling images from gcr.io, which is global.
B
The builder image is too large.
Why wrong: Image size is not a typical cause of intermittent failures; it would cause consistent timeouts.
C
Network egress from Cloud Build is throttled due to high concurrency.
When many builds run concurrently, Cloud Build may throttle egress, causing timeouts pulling images. Reducing concurrency or using a private pool can resolve this.
D
The build service account lacks permissions to access Container Registry.
Why wrong: Permissions issues would result in consistent failures, not intermittent.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Network egress from Cloud Build is throttled due to high concurrency.
The intermittent failure to pull the builder image 'gcr.io/cloud-builders/gcloud' indicates a transient network issue rather than a permanent misconfiguration. Cloud Build uses a shared pool of network resources, and under high concurrency, egress traffic to Container Registry can be throttled, causing pull operations to time out or fail. This explains why the build sometimes succeeds and sometimes fails, as throttling depends on the current load.
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 worker pool is in a different region.
Why it's wrong here
Worker pool region does not affect pulling images from gcr.io, which is global.
✗
The builder image is too large.
Why it's wrong here
Image size is not a typical cause of intermittent failures; it would cause consistent timeouts.
✓
Network egress from Cloud Build is throttled due to high concurrency.
Why this is correct
When many builds run concurrently, Cloud Build may throttle egress, causing timeouts pulling images. Reducing concurrency or using a private pool can resolve this.
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 build service account lacks permissions to access Container Registry.
Why it's wrong here
Permissions issues would result in consistent failures, not intermittent.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between consistent misconfiguration errors (e.g., permissions, region) and transient network throttling issues, where the 'intermittent' keyword is the critical hint to choose throttling over permanent configuration problems.
Detailed technical explanation
How to think about this question
Cloud Build's network egress to Container Registry is subject to Google Cloud's shared networking infrastructure, where per-project egress bandwidth can be throttled under high concurrency or when hitting rate limits (e.g., 1000 requests per 100 seconds per project for gcr.io). This throttling manifests as transient 'Failed to pull' errors, especially during peak usage. In real-world scenarios, teams often misdiagnose this as a permissions issue or image size problem, but the intermittent nature is the key diagnostic clue.
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 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
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: Network egress from Cloud Build is throttled due to high concurrency. — The intermittent failure to pull the builder image 'gcr.io/cloud-builders/gcloud' indicates a transient network issue rather than a permanent misconfiguration. Cloud Build uses a shared pool of network resources, and under high concurrency, egress traffic to Container Registry can be throttled, causing pull operations to time out or fail. This explains why the build sometimes succeeds and sometimes fails, as throttling depends on the current load.
What should I do if I get this PCDOE 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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Question Discussion
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