- A
Create a single service account with broad permissions for all notebook instances and have users impersonate it.
Why wrong: This centralizes permissions but still grants broad access, increasing risk.
- B
Implement resource-level IAM policies on the specific Cloud Storage buckets used, and audit the existing service account permissions.
Resource-level policies allow fine-grained control while maintaining least privilege.
- C
Grant all data scientists the 'Storage Admin' role on the project to ensure they can access any bucket.
Why wrong: Storage Admin is a broad role that violates the least privilege principle.
- D
Move all training data to BigQuery to avoid Cloud Storage permission issues.
Why wrong: Moving data does not solve the root cause and may introduce new complexities.
Quick Answer
The correct answer is to implement resource-level IAM policies on the specific Cloud Storage buckets and audit existing service account permissions. This approach resolves intermittent permission errors because it applies precise access controls directly to the storage resources, ensuring each custom service account has exactly the permissions needed for its designated bucket without granting broader project-level access. On the Google Professional Machine Learning Engineer exam, this scenario tests your understanding of least privilege in Vertex AI Workbench, where inconsistent permissions often stem from misconfigured or missing bucket-level bindings rather than the service accounts themselves. A common trap is choosing to grant a single powerful service account, which violates security policy, or moving data to BigQuery, which is an unnecessary architectural change. Memory tip: think "bucket-level bindings fix bucket-level blues"—always audit and apply permissions at the resource level to maintain security while resolving access issues.
PMLE Collaborating to manage data and models Practice Question
This PMLE practice question tests your understanding of collaborating to manage data and models. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 company uses Vertex AI to build credit risk models. They have a team of 10 data scientists and 3 ML engineers. They use multiple notebooks in Vertex AI Workbench, storing data in Cloud Storage and BigQuery. The team reports that training jobs sometimes fail with 'Permission denied' errors when reading from certain Cloud Storage buckets. The error occurs intermittently and only for some users. The team uses custom service accounts for each user's notebook instance, but the permissions seem inconsistent. The IT security team has enforced that all service accounts must have least privilege. What is the most effective course of action to resolve the permission issues while maintaining security?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"least"Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
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
Implement resource-level IAM policies on the specific Cloud Storage buckets used, and audit the existing service account permissions.
Option C is correct because implementing resource-level IAM policies on the specific Cloud Storage buckets used will provide the necessary permissions without overgranting. Auditing current permissions helps identify gaps. Option A grants too broad access. Option B reduces security by using a single powerful account. Option D changes the data architecture unnecessarily.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Create a single service account with broad permissions for all notebook instances and have users impersonate it.
Why it's wrong here
This centralizes permissions but still grants broad access, increasing risk.
- ✓
Implement resource-level IAM policies on the specific Cloud Storage buckets used, and audit the existing service account permissions.
Why this is correct
Resource-level policies allow fine-grained control while maintaining least privilege.
Clue confirmation
The clue word "least" in the question point toward this answer.
Related concept
Authentication checks who the user is.
- ✗
Grant all data scientists the 'Storage Admin' role on the project to ensure they can access any bucket.
Why it's wrong here
Storage Admin is a broad role that violates the least privilege principle.
- ✗
Move all training data to BigQuery to avoid Cloud Storage permission issues.
Why it's wrong here
Moving data does not solve the root cause and may introduce new complexities.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
- Authentication checks who the user is.
- Authorization controls what the user is allowed to do after login.
- Privilege levels affect access to EXEC and configuration commands.
- AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
- Do not assume successful login means full administrative access.
- Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
- Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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.
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PMLE questions on access control and AAA configuration.
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Collaborating to manage data and models — study guide chapter
Learn the concepts, then practise the questions
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Collaborating to manage data and models practice questions
Targeted practice on this topic area only
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All PMLE questions
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Google Professional Machine Learning Engineer study guide
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PMLE practice test guide
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FAQ
Questions learners often ask
What does this PMLE question test?
Collaborating to manage data and models — This question tests Collaborating to manage data and models — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Implement resource-level IAM policies on the specific Cloud Storage buckets used, and audit the existing service account permissions. — Option C is correct because implementing resource-level IAM policies on the specific Cloud Storage buckets used will provide the necessary permissions without overgranting. Auditing current permissions helps identify gaps. Option A grants too broad access. Option B reduces security by using a single powerful account. Option D changes the data architecture unnecessarily.
What should I do if I get this PMLE question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related PMLE questions on access control and AAA configuration.
Are there clue words in this question I should notice?
Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.
What is the key concept behind this question?
Authentication checks who the user is.
About these practice questions
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Last reviewed: Jun 24, 2026
This PMLE 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 PMLE exam.
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