The answer is the `aws:SecureTransport` condition set to `false` in a `Bool` block. This condition key checks whether the request was sent over SSL/TLS, and by denying access when it is `false`, you effectively enforce encrypted connections in transit to S3. On the AWS Certified Data Engineer Associate DEA-C01 exam, this tests your understanding of S3 bucket policy conditions for network security, often appearing in scenario-based questions where a company must prevent unencrypted HTTP traffic. A common trap is confusing `aws:SecureTransport` with `s3:x-amz-server-side-encryption`, which controls encryption at rest, not in transit. Remember the mnemonic: "Secure Transport for the trip, Server-Side Encryption for the ship"—the first protects data while moving, the second while stored.
DEA-C01 Data Security and Governance Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. 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 wants to ensure that only encrypted connections are used when data is transferred to S3. Which policy condition should be used in an S3 bucket policy?
Option B is correct because aws:SecureTransport checks if the request is sent over SSL/TLS. Option A is wrong because aws:SourceIp checks IP address. Option C is wrong because s3:x-amz-server-side-encryption checks encryption at rest. Option D is wrong because s3:signatureversion checks the signature version, not encryption in transit.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
Denying requests where SecureTransport is false enforces HTTPS.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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 the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
Data Security and Governance — This question tests Data Security and Governance — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Condition: { Bool: { aws:SecureTransport: false } } — Option B is correct because aws:SecureTransport checks if the request is sent over SSL/TLS. Option A is wrong because aws:SourceIp checks IP address. Option C is wrong because s3:x-amz-server-side-encryption checks encryption at rest. Option D is wrong because s3:signatureversion checks the signature version, not encryption in transit.
What should I do if I get this DEA-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related DEA-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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