DEA-C01 Data Operations and Support Practice Question
This DEA-C01 practice question tests your understanding of data operations and support. 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 needs to set up a cross-account access for an S3 bucket so that users in Account B can read objects. The bucket in Account A has a bucket policy that grants access. What additional step is required?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Create an IAM role in Account B and attach a policy that allows s3:GetObject for the bucket.
Option C is correct because cross-account access requires both a bucket policy in the source account and an IAM user/role in the target account with permissions. Option A (disable block public access) is not needed if the bucket policy is not public. Option B (ACLs) are legacy and not recommended. Option D (lifecycle policy) is unrelated.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 S3 object ACLs on the bucket.
Why it's wrong here
ACLs are not required for cross-account access; bucket policies and IAM are the modern approach.
✓
Create an IAM role in Account B and attach a policy that allows s3:GetObject for the bucket.
Why this is correct
Users in Account B need an IAM role or user with explicit permissions to access the bucket.
Related concept
Standard ACLs match source addresses.
✗
Disable S3 Block Public Access settings on the bucket.
Why it's wrong here
Block Public Access applies to public access, not cross-account access via bucket policies.
✗
Set up an S3 Lifecycle policy to replicate objects to Account B.
Why it's wrong here
Replication is for copying objects, not granting access.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
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 ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
Data Operations and Support — This question tests Data Operations and Support — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Create an IAM role in Account B and attach a policy that allows s3:GetObject for the bucket. — Option C is correct because cross-account access requires both a bucket policy in the source account and an IAM user/role in the target account with permissions. Option A (disable block public access) is not needed if the bucket policy is not public. Option B (ACLs) are legacy and not recommended. Option D (lifecycle policy) is unrelated.
What should I do if I get this DEA-C01 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related DEA-C01 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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Question Discussion
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