Cloud Digital Leader Practice Question: Google Cloud products, services, and solutions
This GCDL practice question tests your understanding of google cloud products, services, and solutions. 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 data team has an IAM policy on a BigQuery dataset as shown. Alice needs to run a query that joins across multiple datasets. She receives a permission error. 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 the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Alice lacks the jobUser role to run queries
Option B is correct because the BigQuery `jobUser` role is required to run query jobs, including those that join across datasets. The IAM policy shown only grants dataset-level permissions (like `dataViewer` or `dataOwner`), but Alice lacks the `jobUser` role at the project level, which is necessary to submit a query job. Without this role, she receives a permission error even if she has read access to the datasets.
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 policy denies all users except Bob
Why it's wrong here
No explicit deny; other roles are granted.
✓
Alice lacks the jobUser role to run queries
Why this is correct
Query execution requires jobUser role in addition to data access.
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.
✗
Alice does not have permission to read the dataset
Why it's wrong here
She has dataViewer, which allows reading.
✗
Bob’s dataOwner role prevents others from querying
Why it's wrong here
DataOwner does not block others.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume dataset-level read permissions (like `dataViewer`) are sufficient to run queries, but BigQuery requires the separate `jobUser` role at the project level to execute query jobs.
Detailed technical explanation
How to think about this question
In BigQuery, query execution requires the `bigquery.jobs.create` permission, which is granted by the `jobUser` role at the project level, not at the dataset level. Even if a user has `dataViewer` on all datasets involved in a cross-dataset join, they still need the `jobUser` role to initiate the query job. This is a common pitfall because dataset-level permissions are often confused with job execution permissions.
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.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this GCDL question in full detail.
Google Cloud products, services, and solutions — This question tests Google Cloud products, services, and solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Alice lacks the jobUser role to run queries — Option B is correct because the BigQuery `jobUser` role is required to run query jobs, including those that join across datasets. The IAM policy shown only grants dataset-level permissions (like `dataViewer` or `dataOwner`), but Alice lacks the `jobUser` role at the project level, which is necessary to submit a query job. Without this role, she receives a permission error even if she has read access to the datasets.
What should I do if I get this GCDL 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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