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SOA-C02 Practice Question: S3 bucket policy for cross-account read access…
This SOA-C02 practice question tests your understanding of s3 bucket policy for cross-account read access…. 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. A key principle to apply: s3 bucket policy. 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.
Account A owns an S3 bucket containing shared artifacts. Account B needs to read objects from the bucket. The Account A team wants to grant access without creating IAM users, sharing access keys, or creating a role in Account A that Account B assumes. How should the bucket be configured to allow Account B's IAM roles to read objects?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
Enable S3 Access Points on the bucket and create an access point that allows Account B's VPC to connect via PrivateLink
S3 Access Points simplify access management for large shared datasets and can restrict access to specific VPCs. However, cross-account access through an access point still requires a bucket policy delegation to the access point and a VPC endpoint setup — more configuration than a direct bucket policy grant, and PrivateLink is not strictly required for cross-account S3 access.
B
Best answer
Add an S3 bucket policy on Account A's bucket with Principal set to Account B's account ID and s3:GetObject permission; ensure Account B's roles have s3:GetObject in their identity policies
Cross-account S3 access requires both a resource-based policy (bucket policy) that grants Account B access, and identity-based policies in Account B that allow the action. The bucket policy's Principal field specifies Account B's account root ARN or specific role ARNs. When both sides allow, the call succeeds without any role chaining or credential sharing.
C
Distractor review
Create an IAM role in Account A with s3:GetObject permission and a trust policy allowing Account B's roles to assume it
This approach works (role chaining) but requires Account B's services to call sts:AssumeRole before each S3 operation, adding latency and complexity. The question asks for access without requiring Account B to assume a role in Account A.
D
Distractor review
Generate a presigned URL for each object in Account A and share the URLs with Account B's services
Presigned URLs expire and must be regenerated regularly. They are appropriate for temporary, unauthenticated object access (e.g., browser downloads) but are not suitable for an ongoing programmatic access pattern where Account B's services read many objects on demand.
Common exam trap
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.
Technical deep dive
How to think about this question
Treat this as a scenario question. Identify the problem, the constraint, and the best action. Then compare each option against those facts.
KKey Concepts to Remember
- S3 bucket policy
- cross-account access
- Principal account ID
- resource-based policy
TExam Day Tips
- 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
S3 bucket policy
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
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Question 2
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Question 3
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Question 4
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Question 5
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Question 6
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
S3 bucket policy
What is the correct answer to this question?
The correct answer is: Add an S3 bucket policy on Account A's bucket with Principal set to Account B's account ID and s3:GetObject permission; ensure Account B's roles have s3:GetObject in their identity policies — S3 resource-based bucket policies can grant cross-account access directly to principals from another account. By specifying Account B's account ARN (arn:aws:iam::ACCOUNT_B_ID:root) or specific role ARNs from Account B in the Principal field, Account A grants s3:GetObject permission. Account B's IAM roles still need an identity-based policy that allows s3:GetObject on the bucket ARN. No role assumption in Account A and no shared credentials are needed — the cross-account grant is entirely in the bucket policy.
What should I do if I get this SOA-C02 question wrong?
Review s3 bucket policy, then practise related SOA-C02 questions on the same topic to reinforce the concept.
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