- A
Configure a bucket policy that denies requests that do not include the x-amz-server-side-encryption header.
Why wrong: This enforces at-rest encryption, not transit.
- B
Attach a bucket policy that denies requests when aws:SecureTransport is false.
This enforces HTTPS for all requests.
- C
Enable default encryption on the bucket using SSE-S3.
Why wrong: This encrypts data at rest, not in transit.
- D
Use Amazon CloudFront to serve the content and require HTTPS.
Why wrong: CloudFront can require HTTPS, but direct S3 access would still be possible without HTTPS.
Question 1,579 of 1,748
SCS-C02 Infrastructure Security Practice Question
This SCS-C02 practice question tests your understanding of infrastructure security. 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 company has an S3 bucket that contains sensitive data. The security team wants to ensure that all access to the bucket is encrypted in transit. Which policy should be attached to the bucket to enforce this?
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
✓
Attach a bucket policy that denies requests when aws:SecureTransport is false.
Option B is correct because the `aws:SecureTransport` condition key in an S3 bucket policy evaluates whether the request was sent over HTTPS (TLS). By attaching a bucket policy that denies access when `aws:SecureTransport` is false, the security team enforces that all access to the bucket must be encrypted in transit, blocking any HTTP requests.
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.
- ✗
Configure a bucket policy that denies requests that do not include the x-amz-server-side-encryption header.
Why it's wrong here
This enforces at-rest encryption, not transit.
- ✓
Attach a bucket policy that denies requests when aws:SecureTransport is false.
Why this is correct
This enforces HTTPS for all requests.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable default encryption on the bucket using SSE-S3.
Why it's wrong here
This encrypts data at rest, not in transit.
- ✗
Use Amazon CloudFront to serve the content and require HTTPS.
Why it's wrong here
CloudFront can require HTTPS, but direct S3 access would still be possible without HTTPS.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is confusing encryption in transit (HTTPS/TLS) with encryption at rest (SSE headers or default encryption), leading candidates to pick options that enforce server-side encryption instead of transport-layer security.
Detailed technical explanation
How to think about this question
The `aws:SecureTransport` condition key evaluates the `Transport Layer Security (TLS)` status of the request, which is set by AWS based on whether the request was made over HTTPS (port 443) or HTTP (port 80). This policy works at the S3 API level, meaning it blocks all non-HTTPS requests, including those from the AWS Management Console, SDKs, or CLI, unless they use HTTPS. A common subtlety is that this condition does not check the TLS version, so older, weaker TLS versions (e.g., TLS 1.0) are still allowed unless additional conditions are added.
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
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.
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Infrastructure Security — study guide chapter
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FAQ
Questions learners often ask
What does this SCS-C02 question test?
Infrastructure Security — This question tests Infrastructure Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Attach a bucket policy that denies requests when aws:SecureTransport is false. — Option B is correct because the `aws:SecureTransport` condition key in an S3 bucket policy evaluates whether the request was sent over HTTPS (TLS). By attaching a bucket policy that denies access when `aws:SecureTransport` is false, the security team enforces that all access to the bucket must be encrypted in transit, blocking any HTTP requests.
What should I do if I get this SCS-C02 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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Last reviewed: Jul 4, 2026
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