mediumMultiple Choice
Google ACE Practice Question: A team's Cloud Storage bucket containing backups…
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?
⚠ Common exam trap
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.
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
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.
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 and recreating the bucket destroys the backups and is slower than removing the public IAM binding, so it fails the fastest-remediation requirement. It is tempting because recreation guarantees clean permissions, and it would be correct when a bucket's configuration is irrecoverably corrupted rather than merely exposed.
- ✓
Remove the 'allUsers' IAM binding from the bucket using the Console or gcloud/gsutil
Why this is correct
Removing the allUsers IAM binding eliminates the public principal grant at the bucket's access control layer, immediately revoking anonymous read for everyone. This is faster than rotating credentials or rewriting object ACLs, and directly reverses the accidental public exposure.
- ✗
Enable VPC Service Controls around Cloud Storage to block all external access
Why it's wrong here
VPC Service Controls create a perimeter that blocks access from outside the project, but they do not remove the bucket's public IAM binding, leaving the exposure in place. It is tempting because perimeters restrict external access, and they would be correct when the goal is preventing data exfiltration from a project rather than revoking a specific public grant.
- ✗
Apply a Cloud Armor policy to Cloud Storage to block external IPs
Why it's wrong here
Cloud Armor filters HTTP(S) load-balancer traffic, not Cloud Storage bucket IAM, so it cannot revoke public read access. It is tempting because Cloud Armor enforces perimeter rules, and would be correct for blocking malicious IPs against a load-balanced web application.
Go deeper
Related to this question
Learn chapter
Access Transparency and Access Approval
Key term
IAM binding
An IAM binding is a collection of members (users, groups, or service accounts) assigned to a single role within a Google Cloud resource policy, defining who has what permissions.
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.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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.