The correct answer is enabling uniform bucket-level access on all buckets to disable ACLs, combined with setting the organization policy constraint `iam.disableBucketPolicyOnlyGrantedByDefault`. This pair of actions directly prevents public exposure of Cloud Storage buckets by eliminating fine-grained ACLs, which are a common source of accidental public access, and enforcing IAM-based access control across the entire organization. On the Google Professional Cloud Security Engineer exam, this scenario tests your understanding of how to harden storage at scale using organization policies rather than relying on per-bucket settings—a frequent trap is assuming that simply reviewing ACLs is sufficient, when the real security posture requires a preventive, policy-driven approach. A strong memory tip is to think of it as “disable ACLs, enforce IAM by default,” which maps to the two actions: turning off ACLs at the bucket level and making that the enforced default across all new buckets via the organization policy.
PCSE Ensuring data protection Practice Question
This PCSE practice question tests your understanding of ensuring data protection. 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.
Which TWO actions should a security engineer take to protect sensitive data in Cloud Storage buckets from accidental public exposure? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Set the organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' to enforce uniform bucket-level access across the organization.
Option B is correct because setting the organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' enforces uniform bucket-level access across the organization, preventing the use of fine-grained ACLs that can accidentally expose data. This policy ensures that all new buckets default to IAM-based access control, reducing the risk of misconfigured public ACLs.
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.
✗
Use Cloud Data Loss Prevention (DLP) to scan buckets for public access.
Why it's wrong here
DLP does not prevent public access; it scans for sensitive data.
✓
Set the organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' to enforce uniform bucket-level access across the organization.
Why this is correct
Prevents public ACLs at the org level.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure VPC Service Controls to restrict access to the buckets from within the VPC.
Why it's wrong here
VPC-SC does not prevent public exposure; it restricts network paths.
✓
Enable uniform bucket-level access on all buckets to disable ACLs.
Why this is correct
Uniform access ensures access is controlled only by IAM.
Related concept
Read the scenario before looking for a memorised answer.
✗
Enable bucket lock on all buckets to prevent deletion of objects.
Why it's wrong here
Bucket lock does not prevent public access.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Google Cloud often tests the distinction between detection tools (like DLP) and preventive controls (like organization policy constraints), leading candidates to mistakenly choose DLP as a protective measure against public exposure.
Detailed technical explanation
How to think about this question
Uniform bucket-level access disables ACLs and forces all access decisions to be evaluated through IAM policies, eliminating the risk of accidentally granting public read/write via ACLs. The organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' ensures that when a new bucket is created, uniform bucket-level access is enabled by default, preventing legacy ACL-based permissions from being used. In practice, this is critical for organizations with many teams creating buckets, as it enforces a consistent security baseline without relying on individual user compliance.
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: Set the organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' to enforce uniform bucket-level access across the organization. — Option B is correct because setting the organization policy constraint 'iam.disableBucketPolicyOnlyGrantedByDefault' enforces uniform bucket-level access across the organization, preventing the use of fine-grained ACLs that can accidentally expose data. This policy ensures that all new buckets default to IAM-based access control, reducing the risk of misconfigured public ACLs.
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.
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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