The answer is the IAM condition restricts Cloud Storage object access by prefix, specifically requiring objects to start with 'uploads/'. This is correct because the condition key `resource.name.startsWith('my-bucket/uploads/')` evaluates the object path against the prefix; since `gs://my-bucket/reports/data.csv` begins with 'reports/' rather than 'uploads/', the condition returns false, denying the `storage.objects.get` permission despite Alice holding the `roles/storage.objectAdmin` role. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how IAM conditions with `resource.name.startsWith` can override broader roles—a common trap is assuming a high-level role like objectAdmin grants blanket access, but conditions create granular restrictions that must be satisfied. Remember the memory tip: "Prefix first, permission last"—the condition checks the object's path prefix before any role-based permission is granted.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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.
Alice has the role roles/storage.objectAdmin on the bucket my-bucket via the IAM policy shown. She is unable to access the object gs://my-bucket/reports/data.csv. What is the most likely reason?
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 condition restricts access to objects with a prefix 'uploads/', and the requested object is under 'reports/'.
The condition resource.name.startsWith('projects/_/buckets/my-bucket/objects/uploads/') only allows access to objects whose path starts with 'uploads/'. The object 'reports/data.csv' does not match.
B
The bucket has a retention policy that prevents access to objects older than a certain period.
Why wrong: There is no information about a retention policy, and the issue is explained by the IAM condition.
C
The condition uses the wrong resource attribute; it should be resource.name.startsWith('my-bucket/uploads/').
Why wrong: The correct format for resource.name starts with 'projects/_/buckets/BUCKET_NAME/objects/'. The condition is syntactically correct.
D
Alice does not have the storage.objects.get permission on the bucket.
Why wrong: The role roles/storage.objectAdmin includes storage.objects.get, so permission is granted.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The condition restricts access to objects with a prefix 'uploads/', and the requested object is under 'reports/'.
The IAM policy condition uses the `resource.name.startsWith('my-bucket/uploads/')` condition key, which restricts the `storage.objects.get` permission to objects whose name starts with `uploads/`. The requested object `gs://my-bucket/reports/data.csv` is under the `reports/` prefix, so the condition evaluates to false, denying access. This is the most likely reason Alice cannot access the object.
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 condition restricts access to objects with a prefix 'uploads/', and the requested object is under 'reports/'.
Why this is correct
The condition resource.name.startsWith('projects/_/buckets/my-bucket/objects/uploads/') only allows access to objects whose path starts with 'uploads/'. The object 'reports/data.csv' does not match.
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 bucket has a retention policy that prevents access to objects older than a certain period.
Why it's wrong here
There is no information about a retention policy, and the issue is explained by the IAM condition.
✗
The condition uses the wrong resource attribute; it should be resource.name.startsWith('my-bucket/uploads/').
Why it's wrong here
The correct format for resource.name starts with 'projects/_/buckets/BUCKET_NAME/objects/'. The condition is syntactically correct.
✗
Alice does not have the storage.objects.get permission on the bucket.
Why it's wrong here
The role roles/storage.objectAdmin includes storage.objects.get, so permission is granted.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the nuance that IAM conditions can silently override explicit allow permissions, leading candidates to overlook the condition and incorrectly blame missing permissions or unrelated bucket policies.
Detailed technical explanation
How to think about this question
IAM condition keys like `resource.name.startsWith` are evaluated at request time against the resource name (the object path). The condition must match exactly for the permission to be effective; if it fails, the entire IAM statement is treated as not applying, and the default deny takes effect. This is a common pattern for scoping access to specific prefixes within a bucket, but it requires careful alignment with the actual object paths.
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.
Ensuring data protection — This question tests Ensuring data protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The condition restricts access to objects with a prefix 'uploads/', and the requested object is under 'reports/'. — The IAM policy condition uses the `resource.name.startsWith('my-bucket/uploads/')` condition key, which restricts the `storage.objects.get` permission to objects whose name starts with `uploads/`. The requested object `gs://my-bucket/reports/data.csv` is under the `reports/` prefix, so the condition evaluates to false, denying access. This is the most likely reason Alice cannot access the object.
What should I do if I get this PCSE 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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