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Google ACE Practice Question: A developer creates a Cloud Storage bucket and…
A developer creates a Cloud Storage bucket and sets a uniform bucket-level access policy. What is the implication?
⚠ Common exam trap
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.
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
✓
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.
Answer analysis
Option-by-option breakdown
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
This is incorrect because enabling uniform bucket-level access (UBLA) does not switch to object ACLs; it does the opposite. When UBLA is enabled, object ACLs are completely disabled and are not evaluated for any access decision. Access is determined exclusively by IAM policies attached to the bucket, so relying solely on object ACLs is impossible.
- ✗
Bucket permissions override object ACLs
Why it's wrong here
This is incorrect because bucket permissions do not merely take precedence over object ACLs; they eliminate their use. With UBLA enabled, object ACLs are disabled entirely, meaning they are never read or evaluated during authorization. The statement implies a layering or override behavior, but in reality, ACLs become irrelevant and cannot override or be overridden by IAM.
- ✗
Both bucket IAM and object ACLs are used
Why it's wrong here
This is incorrect because UBLA is an all-or-nothing access control mode. When uniform bucket-level access is enabled, only bucket-level IAM policies are used to govern access, and all object ACLs are disabled. There is no coexistence or combination of the two mechanisms; enabling UBLA disables ACLs at the object level entirely.
- ✓
Object ACLs are disabled
Why this is correct
This is correct. When uniform bucket-level access (UBLA) is enabled on a bucket, all object ACLs are disabled, and access to objects is controlled solely by IAM permissions on the bucket itself. This ensures that per-object ACLs cannot conflict with bucket-level policies, simplifying permission management by enforcing a single, unified access control mechanism.
Go deeper
Related to this question
Learn chapter
Google Cloud Platform Overview
Key term
Cloud storage
Cloud storage is a service that lets you save data on remote servers accessed over the internet instead of on your computer's hard drive.
Key term
IAM
Identity and Access Management (IAM) is a framework of policies and technologies that ensures the right individuals have the appropriate access to technology resources.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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