This DEA-C01 practice question tests your understanding of data security and governance. 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 needs to enforce encryption in transit for all data moving between its Amazon S3 bucket and a fleet of Amazon EC2 instances. The data is accessed via S3 API calls over the internet. Which configuration ensures encryption in transit?
Enable SSE-S3 on the bucket.
Why wrong: SSE-S3 encrypts data at rest, not in transit.
Enable S3 Transfer Acceleration.
Why wrong: Transfer Acceleration speeds up uploads, does not enforce encryption.
Use a VPC endpoint for S3.
Why wrong: VPC endpoint does not enforce encryption; HTTPS still needed.
Configure the bucket policy to deny requests that do not use HTTPS.
Bucket policy with condition aws:SecureTransport true enforces HTTPS.
Answer choices
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 policy to deny requests that do not use HTTPS.
Option B is correct because requiring HTTPS for S3 API calls ensures encryption in transit. Option A is wrong because SSE-S3 encrypts data at rest, not in transit. Option C is wrong because a VPC endpoint uses AWS network but does not enforce encryption; HTTPS must still be used. Option D is wrong because a bucket policy denying HTTP access is the correct way to enforce HTTPS.
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
For each option: why learners choose it and why it is or isn't the right answer here.
Enable SSE-S3 on the bucket.
Why it's wrong here
SSE-S3 encrypts data at rest, not in transit.
Enable S3 Transfer Acceleration.
Why it's wrong here
Transfer Acceleration speeds up uploads, does not enforce encryption.
Use a VPC endpoint for S3.
Why it's wrong here
VPC endpoint does not enforce encryption; HTTPS still needed.
Configure the bucket policy to deny requests that do not use HTTPS.
Why this is correct
Bucket policy with condition aws:SecureTransport true enforces HTTPS.
Related concept
Standard ACLs match source addresses.
Common exam traps
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
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.
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
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
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 DEA-C01 ACL questions on filtering logic and placement.
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FAQ
Data Security and Governance — This question tests Data Security and Governance — Standard ACLs match source addresses..
The correct answer is: Configure the bucket policy to deny requests that do not use HTTPS. — Option B is correct because requiring HTTPS for S3 API calls ensures encryption in transit. Option A is wrong because SSE-S3 encrypts data at rest, not in transit. Option C is wrong because a VPC endpoint uses AWS network but does not enforce encryption; HTTPS must still be used. Option D is wrong because a bucket policy denying HTTP access is the correct way to enforce HTTPS.
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 DEA-C01 ACL questions on filtering logic and placement.
Standard ACLs match source addresses.
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Last reviewed: Jun 20, 2026
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