- A
Delete the bucket and recreate it with correct permissions
Why wrong: Deleting the bucket destroys all backup data — a drastic and unnecessary action for a permissions change.
- B
Remove the 'allUsers' IAM binding from the bucket using the Console or gcloud/gsutil
Removing the `allUsers:objectViewer` binding immediately revokes public read access without affecting the data or other users' access.
- C
Enable VPC Service Controls around Cloud Storage to block all external access
Why wrong: VPC Service Controls prevent access from outside a defined perimeter — configuring this is much slower and broader than simply removing the public IAM binding.
- D
Apply a Cloud Armor policy to Cloud Storage to block external IPs
Why wrong: Cloud Armor applies to HTTP load balancers, not Cloud Storage directly — it cannot be applied to a bucket's public access.
Remove Public Access: Delete allUsers IAM Binding
This ACE practice question tests your understanding of ace exam topics. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 team's Cloud Storage bucket containing backups has been accidentally made publicly readable. A monitoring alert fires. What is the fastest way to remove public access?
Quick Answer
The fastest way to remove public access from a Cloud Storage bucket is to delete the allUsers IAM binding using the Console or the gsutil command `gsutil iam ch -d allUsers:objectViewer gs://[BUCKET]`. This works because public access is granted when an IAM binding includes the special principal `allUsers`, which represents any internet user, or `allAuthenticatedUsers`, which includes any Google-authenticated account; removing these bindings immediately revokes that public read or write permission. On the Google Associate Cloud Engineer exam, this scenario tests your understanding of IAM policy management at the bucket level versus object-level ACLs, and a common trap is to mistakenly enable uniform bucket-level access first, which is a slower two-step process. Remember the memory tip: "allUsers is the public key—delete the binding, not the bucket."
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
Remove the 'allUsers' IAM binding from the bucket using the Console or gcloud/gsutil
Option B is correct because removing the 'allUsers' IAM binding from the bucket is the fastest and most direct way to revoke public access. This can be done via the Cloud Console, gsutil iam ch -d allUsers gs://BUCKET_NAME, or gcloud commands, immediately restoring the bucket's private state without any data loss or additional configuration.
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.
- ✗
Delete the bucket and recreate it with correct permissions
Why it's wrong here
Deleting the bucket destroys all backup data — a drastic and unnecessary action for a permissions change.
- ✓
Remove the 'allUsers' IAM binding from the bucket using the Console or gcloud/gsutil
Why this is correct
Removing the `allUsers:objectViewer` binding immediately revokes public read access without affecting the data or other users' access.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable VPC Service Controls around Cloud Storage to block all external access
Why it's wrong here
VPC Service Controls prevent access from outside a defined perimeter — configuring this is much slower and broader than simply removing the public IAM binding.
- ✗
Apply a Cloud Armor policy to Cloud Storage to block external IPs
Why it's wrong here
Cloud Armor applies to HTTP load balancers, not Cloud Storage directly — it cannot be applied to a bucket's public access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the misconception that deleting and recreating a resource is the fastest way to fix a permission error, when in fact a targeted IAM binding removal is both quicker and safer.
Detailed technical explanation
How to think about this question
Cloud Storage access control is evaluated by first checking IAM permissions, then ACLs if uniform bucket-level access is not enforced. Removing the 'allUsers' IAM binding immediately revokes public read access because IAM denies take precedence over allows; the change propagates within seconds via Google's global IAM system. This operation is idempotent and does not affect other bindings or bucket contents, making it ideal for incident response.
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.
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FAQ
Questions learners often ask
What does this ACE question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: Remove the 'allUsers' IAM binding from the bucket using the Console or gcloud/gsutil — Option B is correct because removing the 'allUsers' IAM binding from the bucket is the fastest and most direct way to revoke public access. This can be done via the Cloud Console, gsutil iam ch -d allUsers gs://BUCKET_NAME, or gcloud commands, immediately restoring the bucket's private state without any data loss or additional configuration.
What should I do if I get this ACE question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 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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