This ACE practice question tests your understanding of configuring access and security. 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 developer creates a Cloud Storage bucket and sets a uniform bucket-level access policy. What is the implication?
Only object ACLs are used
Why wrong: Bucket IAM takes precedence; object ACLs are disabled.
Bucket permissions override object ACLs
Why wrong: With UBLA, object ACLs are disabled entirely, not overridden.
Both bucket IAM and object ACLs are used
Why wrong: Only bucket IAM is used; object ACLs are disabled.
Object ACLs are disabled
UBLA disables object ACLs; all access is via bucket IAM.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Object ACLs are disabled
When uniform bucket-level access is enabled on a Cloud Storage bucket, all access control is managed exclusively through IAM policies at the bucket level. Object ACLs are disabled, meaning individual object permissions cannot be set or evaluated. This ensures consistent access control across all objects in the bucket.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Only object ACLs are used
Why it's wrong here
Bucket IAM takes precedence; object ACLs are disabled.
Bucket permissions override object ACLs
Why it's wrong here
With UBLA, object ACLs are disabled entirely, not overridden.
Both bucket IAM and object ACLs are used
Why it's wrong here
Only bucket IAM is used; object ACLs are disabled.
Object ACLs are disabled
Why this is correct
UBLA disables object ACLs; all access is via bucket IAM.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Google Cloud often tests the misconception that uniform bucket-level access 'overrides' or 'takes precedence over' object ACLs, when in fact it completely disables them, making any ACL-related operations invalid.
Detailed technical explanation
Under the hood, enabling uniform bucket-level access sets a bucket metadata flag that causes the Cloud Storage API to reject any attempt to set or read object ACLs, returning a 400 error. This is enforced at the storage layer, ensuring that access decisions are made solely based on IAM policies bound to the bucket, project, or organization. A real-world scenario is when an organization needs to enforce least-privilege access across millions of objects without the risk of inconsistent ACLs.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Configuring access and security — This question tests Configuring access and security — Read the scenario before looking for a memorised answer..
The correct answer is: Object ACLs are disabled — When uniform bucket-level access is enabled on a Cloud Storage bucket, all access control is managed exclusively through IAM policies at the bucket level. Object ACLs are disabled, meaning individual object permissions cannot be set or evaluated. This ensures consistent access control across all objects in the bucket.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 30, 2026
This ACE 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 ACE exam.
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