The correct actions are to create IAM policies that grant least privilege access to users and to use S3 bucket policies to enforce encryption at rest and control access. This combination ensures that sensitive financial data in the data lake is both encrypted server-side and only accessible by authorized principals, aligning with the principle of defense in depth. On the AWS Certified Data Engineer Associate DEA-C01 exam, this scenario tests your understanding of how IAM and resource-based policies work together to meet security requirements, with a common trap being the selection of SSE-C or ACLs—SSE-C forces you to manage your own keys, which is not recommended for a managed service, while ACLs are legacy and lack the granularity of modern policies. Remember the memory tip: “IAM for who, bucket policy for what”—IAM policies define user permissions, while bucket policies enforce conditions like encryption on the resource itself.
DEA-C01 Data Store Management Practice Question
This DEA-C01 practice question tests your understanding of data store management. 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 data engineer is designing a data lake on Amazon S3 that will store sensitive financial data. The engineer needs to implement encryption at rest and ensure that only authorized users can access the data. Which TWO actions should the engineer take to meet these requirements? (Choose TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure a bucket policy that denies writes if the object is not encrypted.
Option A is correct because S3 bucket policies can be used to enforce encryption and control access. Option C is correct because IAM policies define user permissions. Option B is incorrect because SSE-C is not recommended as it requires managing your own keys. Option D is incorrect because S3 Transfer Acceleration is for speed, not security. Option E is incorrect because ACLs are legacy and not recommended for access control.
Key principle: Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 writes if the object is not encrypted.
Why this is correct
Bucket policies can enforce encryption and control access.
Related concept
Authentication checks who the user is.
✗
Use server-side encryption with customer-provided keys (SSE-C).
Why it's wrong here
SSE-C requires managing your own keys, which is not recommended for simplicity.
✗
Enable S3 Transfer Acceleration for the bucket.
Why it's wrong here
Transfer Acceleration improves upload speed, not security.
✗
Enable object-level access control lists (ACLs).
Why it's wrong here
ACLs are legacy; bucket policies and IAM are recommended.
✓
Create IAM policies that grant least privilege access to users.
Why this is correct
IAM policies define who can access S3 resources.
Related concept
Authentication checks who the user is.
Common exam traps
Common exam trap: authentication is not authorization
Logging in proves the user can authenticate. It does not automatically mean the user is allowed to enter privileged or configuration mode. Watch for AAA authorization, privilege level and command authorization details.
Detailed technical explanation
How to think about this question
This kind of question is testing the difference between identity and permission. A user may successfully log in to a router because authentication is working, but still fail to enter configuration mode because authorization is missing, misconfigured or mapped to a lower privilege level.
KKey Concepts to Remember
Authentication checks who the user is.
Authorization controls what the user is allowed to do after login.
Privilege levels affect access to EXEC and configuration commands.
AAA, TACACS+ and RADIUS can separate login success from command access.
TExam Day Tips
→Do not assume successful login means full administrative access.
→Look for words such as cannot enter configuration mode, privilege level, authorization or command access.
→Separate login problems from permission problems before choosing the answer.
Key takeaway
Authentication proves identity; authorization controls what that identity can do after login. Both must work for full privileged access.
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 Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DEA-C01 questions on access control and AAA configuration.
Data Store Management — This question tests Data Store Management — Authentication checks who the user is..
What is the correct answer to this question?
The correct answer is: Configure a bucket policy that denies writes if the object is not encrypted. — Option A is correct because S3 bucket policies can be used to enforce encryption and control access. Option C is correct because IAM policies define user permissions. Option B is incorrect because SSE-C is not recommended as it requires managing your own keys. Option D is incorrect because S3 Transfer Acceleration is for speed, not security. Option E is incorrect because ACLs are legacy and not recommended for access control.
What should I do if I get this DEA-C01 question wrong?
Review Cisco AAA concepts — authentication, authorization, and accounting. Study privilege levels (0–15), command authorization under TACACS+, and how RADIUS differs. Then practise related DEA-C01 questions on access control and AAA configuration.
What is the key concept behind this question?
Authentication checks who the user is.
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Question Discussion
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