Quick Answer
The answer is to add a bucket policy that denies requests without encryption in transit, alongside enabling default encryption for data at rest and using server-side encryption with KMS (SSE-KMS) or AES-256 (SSE-S3). This is correct because enforcing encryption in transit requires a bucket policy with a condition key like `aws:SecureTransport` set to `false` to deny HTTP requests, ensuring all data travels over HTTPS/TLS; for encryption at rest, you configure the bucket’s default encryption settings or apply an object-level policy requiring the `x-amz-server-side-encryption` header. On the AWS Certified Developer Associate DVA-C02 exam, this scenario tests your understanding of S3 security policies versus default encryption settings—a common trap is confusing bucket policies with bucket settings, as policies enforce conditions on client behavior while settings apply server-side. Remember the memory tip: “Policy for the pipe, settings for the store”—the bucket policy secures the transmission pipe (in transit), while default encryption secures the stored data (at rest).
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 company stores sensitive data in an S3 bucket. The security team requires that all data be encrypted at rest and in transit. Which THREE measures should be implemented?
Use HTTPS for all requests to S3
Encrypts data in transit.
Enable server-side encryption (SSE) on the S3 bucket
Encrypts data at rest.
Add a bucket policy that denies requests without encryption in transit
Enforces HTTPS.
Use client-side encryption
Why wrong: Not required; server-side encryption suffices.
Enable MFA Delete on the bucket
Why wrong: MFA Delete protects against accidental deletion, not encryption.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use HTTPS for all requests to S3
Option A is correct because HTTPS encrypts data in transit between the client and S3 using TLS, ensuring confidentiality and integrity during transmission. This satisfies the requirement for encryption in transit, as HTTP requests would send data in plaintext.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Use HTTPS for all requests to S3
Why this is correct
Encrypts data in transit.
Related concept
Read the scenario before looking for a memorised answer.
Enable server-side encryption (SSE) on the S3 bucket
Why this is correct
Encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
Add a bucket policy that denies requests without encryption in transit
Why this is correct
Enforces HTTPS.
Related concept
Read the scenario before looking for a memorised answer.
Use client-side encryption
Why it's wrong here
Not required; server-side encryption suffices.
Enable MFA Delete on the bucket
Why it's wrong here
MFA Delete protects against accidental deletion, not encryption.
Common exam traps
The trap here is that candidates may confuse client-side encryption as a bucket-level security measure, but it is an application-side implementation that does not enforce encryption at the S3 bucket level, and MFA Delete is a red herring unrelated to encryption requirements.
Detailed technical explanation
Server-side encryption (SSE) can be configured with SSE-S3, SSE-KMS, or SSE-C, each using different key management approaches; SSE-S3 uses AES-256 managed by AWS, while SSE-KMS provides additional control and audit trails via AWS KMS. The bucket policy condition 'aws:SecureTransport' checks if the request uses HTTPS, and setting it to 'false' denies any HTTP requests, effectively enforcing encryption in transit at the bucket policy level.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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
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FAQ
Security — This question tests Security — Read the scenario before looking for a memorised answer..
The correct answer is: Use HTTPS for all requests to S3 — Option A is correct because HTTPS encrypts data in transit between the client and S3 using TLS, ensuring confidentiality and integrity during transmission. This satisfies the requirement for encryption in transit, as HTTP requests would send data in plaintext.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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