The answer is to enable S3 Block Public Access at the account level. This feature acts as a preventative guardrail that overrides any bucket policies, access control lists (ACLs), or object-level permissions that would otherwise grant public access, ensuring that no new objects can be made publicly accessible automatically. On the AWS Certified Security Specialty SCS-C02 exam, this concept tests your understanding of defense-in-depth for data exposure, often appearing in scenario-based questions where a bucket policy might seem sufficient but lacks enforcement. A common trap is choosing bucket policies alone, which can be circumvented if not combined with Block Public Access, or confusing Object Lock (which prevents deletion) with access controls. Remember the mnemonic “BPA blocks all public paths” to recall that Block Public Access at the account level is the only setting that universally prevents public access across all buckets and objects.
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of 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.
A company stores sensitive customer data in Amazon S3. To comply with data protection regulations, they need to automatically prevent any new objects from being made publicly accessible. Which S3 feature should they configure?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 Block Public Access at the account level.
Option B is correct because S3 Block Public Access settings at the account or bucket level can enforce that no new objects or ACLs grant public access. Option A is wrong because bucket policies can be circumvented if not enforced; Block Public Access is a preventative guardrail. Option C is wrong because Object Lock prevents deletion/overwrite but doesn't control public access. Option D is wrong because default encryption only encrypts data at rest.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Enable S3 Block Public Access at the account level.
Why this is correct
Block Public Access provides a centralized way to prevent any public access to buckets and objects.
Related concept
Standard ACLs match source addresses.
✗
Configure a bucket policy that denies s3:PutObject with a condition for public access.
Why it's wrong here
Bucket policies can be overridden by individual object ACLs; Block Public Access is more comprehensive.
✗
Use S3 default encryption with SSE-S3.
Why it's wrong here
Default encryption secures data at rest but does not prevent public access.
✗
Enable S3 Object Lock in governance mode.
Why it's wrong here
Object Lock prevents object deletion or overwrite but does not restrict public access.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
Data Protection — This question tests Data Protection — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Enable S3 Block Public Access at the account level. — Option B is correct because S3 Block Public Access settings at the account or bucket level can enforce that no new objects or ACLs grant public access. Option A is wrong because bucket policies can be circumvented if not enforced; Block Public Access is a preventative guardrail. Option C is wrong because Object Lock prevents deletion/overwrite but doesn't control public access. Option D is wrong because default encryption only encrypts data at rest.
What should I do if I get this SCS-C02 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related SCS-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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