The correct actions are to configure a bucket policy that denies requests not using aws:SecureTransport and to enable bucket default encryption with SSE-S3 or SSE-KMS. This pairing addresses both halves of the requirement: the bucket policy enforces encryption in transit by blocking any HTTP requests, while default encryption ensures all objects stored at rest are automatically encrypted. On the AWS Certified Security Specialty SCS-C02 exam, this scenario tests your understanding that default encryption alone does not protect data in motion—a common trap is assuming enabling SSE-S3 covers both states. The exam often pairs these two controls to satisfy compliance mandates like HIPAA for PHI, and a frequent mistake is selecting CloudHSM or Kinesis Firehose, which are unnecessary here. Remember the mnemonic: "Policy for the pipe, default for the pile"—the bucket policy secures the data pipe (in transit), and default encryption secures the data pile (at rest).
SCS-C02 Data Protection Practice Question
This SCS-C02 practice question tests your understanding of data protection. 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 security engineer is designing a data protection strategy for a healthcare application that stores Protected Health Information (PHI) in an S3 bucket. The bucket is accessed by multiple AWS services, including Athena and SageMaker. Which TWO actions should the engineer take to ensure encryption at rest and in transit? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Enable S3 bucket default encryption using AES-256.
Option A is wrong because while default encryption provides at-rest encryption, it does not enforce encryption in transit. Option B is correct because a bucket policy that denies requests without HTTPS ensures encryption in transit. Option C is correct because enabling bucket default encryption with SSE-S3 or SSE-KMS ensures encryption at rest. Option D (CloudHSM) is not necessary for S3 encryption and adds complexity. Option E is wrong because Kinesis Data Firehose is not directly relevant to S3 encryption.
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.
✗
Enable default encryption on the S3 bucket using SSE-S3.
Why it's wrong here
Default encryption only encrypts data at rest, not in transit.
✓
Enable S3 bucket default encryption using AES-256.
Why this is correct
AES-256 encryption (SSE-S3) encrypts data at rest.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use AWS CloudHSM to generate and store encryption keys for S3.
Why it's wrong here
CloudHSM is not required; SSE-S3 or SSE-KMS is sufficient for S3 encryption.
✗
Set up Kinesis Data Firehose to encrypt data before writing to S3.
Why it's wrong here
Kinesis Firehose is not the standard way to enforce S3 encryption; bucket policies and default encryption are more direct.
✓
Configure a bucket policy that denies requests not using aws:SecureTransport.
Why this is correct
This ensures all requests are made over HTTPS, enforcing encryption in transit.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→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 SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Data Protection — This question tests Data Protection — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Enable S3 bucket default encryption using AES-256. — Option A is wrong because while default encryption provides at-rest encryption, it does not enforce encryption in transit. Option B is correct because a bucket policy that denies requests without HTTPS ensures encryption in transit. Option C is correct because enabling bucket default encryption with SSE-S3 or SSE-KMS ensures encryption at rest. Option D (CloudHSM) is not necessary for S3 encryption and adds complexity. Option E is wrong because Kinesis Data Firehose is not directly relevant to S3 encryption.
What should I do if I get this SCS-C02 question wrong?
Identify which SCS-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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