This DVA-C02 practice question tests your understanding of 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 developer wants to enforce that all requests to an Amazon S3 bucket must use HTTPS (TLS). The bucket is used for static website hosting. Which bucket policy condition should be used to deny requests that do not use HTTPS?
The condition aws:SecureTransport with value 'false' matches requests that are not using HTTPS. Adding a Deny effect with this condition enforces HTTPS.
B
"aws:SecureTransport": "true"
Why wrong: This condition matches requests that use HTTPS. Using it in a Deny statement would deny HTTPS requests, which is the opposite of the desired policy.
C
"aws:SourceVpc": "true"
Why wrong: This condition checks the VPC from which the request originated; it does not enforce HTTPS.
D
"aws:Referer": "https"
Why wrong: This condition checks the HTTP Referer header; it does not enforce encryption in transit.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
"aws:SecureTransport": "false"
Option A is correct because the `aws:SecureTransport` condition key evaluates to `false` when the request is not sent over HTTPS (TLS). By using a Deny effect with this condition set to `false`, the policy blocks any HTTP requests to the S3 bucket, ensuring all traffic uses encrypted connections. This is a standard approach for enforcing TLS on S3 buckets, including those used for static website hosting.
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.
✓
"aws:SecureTransport": "false"
Why this is correct
The condition aws:SecureTransport with value 'false' matches requests that are not using HTTPS. Adding a Deny effect with this condition enforces HTTPS.
Related concept
Read the scenario before looking for a memorised answer.
✗
"aws:SecureTransport": "true"
Why it's wrong here
This condition matches requests that use HTTPS. Using it in a Deny statement would deny HTTPS requests, which is the opposite of the desired policy.
✗
"aws:SourceVpc": "true"
Why it's wrong here
This condition checks the VPC from which the request originated; it does not enforce HTTPS.
✗
"aws:Referer": "https"
Why it's wrong here
This condition checks the HTTP Referer header; it does not enforce encryption in transit.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse `aws:SecureTransport` with `aws:SourceVpc` or `aws:Referer`, or mistakenly think setting the condition to `true` in a Deny statement will block non-HTTPS traffic, when in fact it would block HTTPS traffic instead.
Detailed technical explanation
How to think about this question
The `aws:SecureTransport` condition key checks whether the request was sent over TLS (HTTPS) by inspecting the underlying transport layer; it is a global condition key available for all AWS services that support HTTPS. For S3 static website hosting, the bucket policy must explicitly deny HTTP requests because the website endpoint (e.g., `bucket-name.s3-website-region.amazonaws.com`) supports both HTTP and HTTPS by default. A common real-world scenario is compliance with PCI DSS or HIPAA, which require encryption in transit, making this condition critical for security audits.
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.
Security — This question tests Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: "aws:SecureTransport": "false" — Option A is correct because the `aws:SecureTransport` condition key evaluates to `false` when the request is not sent over HTTPS (TLS). By using a Deny effect with this condition set to `false`, the policy blocks any HTTP requests to the S3 bucket, ensuring all traffic uses encrypted connections. This is a standard approach for enforcing TLS on S3 buckets, including those used for static website hosting.
What should I do if I get this DVA-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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