The correct answer involves three actions: enabling S3 Block Public Access at the bucket level, removing existing public ACLs, and disabling public ACLs via S3 Object Ownership. These three steps work together to prevent public access to an S3 bucket because Block Public Access acts as an overarching override that stops any public policies or ACLs from taking effect, while removing current public ACLs cleans up any existing exposure, and disabling future public ACLs through Object Ownership ensures no new public grants can be created. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this question tests your understanding of layered S3 security controls—a common trap is thinking that simply deleting the bucket policy is enough, but that ignores public ACLs, which can still grant public read access to individual objects. Another trap is confusing versioning with access control; enabling versioning has no effect on public access. A useful memory tip is "Block, Remove, Disable"—think of the three layers as a shield, a cleanup, and a lock to keep your bucket private.
SOA-C02 Security and Compliance Practice Question
This SOA-C02 practice question tests your understanding of security and compliance. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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 SysOps administrator needs to ensure that an Amazon S3 bucket is not publicly accessible. Which THREE actions should be taken to prevent public access?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the bucket to block new public ACLs using S3 Object Ownership.
Correct options: A, C, E. Option A is correct because blocking public access at the bucket level prevents any public policies or ACLs. Option C is correct because removing public ACLs ensures no objects are publicly accessible. Option E is correct because disabling public ACLs via S3 Object Ownership prevents future public ACLs. Option B is wrong because deleting the bucket policy does not address public ACLs. Option D is wrong because enabling versioning does not affect public access.
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 versioning on the bucket.
Why it's wrong here
Versioning does not affect access control.
✗
Delete the bucket policy if it exists.
Why it's wrong here
Does not address public ACLs.
✓
Configure the bucket to block new public ACLs using S3 Object Ownership.
Why this is correct
Prevents future public ACLs.
Related concept
Standard ACLs match source addresses.
✓
Review and remove any public ACLs on the bucket and objects.
Why this is correct
Removes existing public access via ACLs.
Related concept
Standard ACLs match source addresses.
✓
Use the S3 Block Public Access feature at the bucket level.
Why this is correct
Blocks all public access settings.
Related concept
Standard ACLs match source addresses.
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 SOA-C02 ACL questions on filtering logic and placement.
Security and Compliance — This question tests Security and Compliance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Configure the bucket to block new public ACLs using S3 Object Ownership. — Correct options: A, C, E. Option A is correct because blocking public access at the bucket level prevents any public policies or ACLs. Option C is correct because removing public ACLs ensures no objects are publicly accessible. Option E is correct because disabling public ACLs via S3 Object Ownership prevents future public ACLs. Option B is wrong because deleting the bucket policy does not address public ACLs. Option D is wrong because enabling versioning does not affect public access.
What should I do if I get this SOA-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 SOA-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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