- A
Use a bucket policy with aws:PrincipalTag condition
This is correct. The 'aws:PrincipalTag' condition key in a bucket policy evaluates the tags attached to the IAM principal (user or role) making the request, allowing fine-grained access control based on those tags.
- B
Use S3 object tags and a bucket policy condition
Why wrong: This is incorrect. S3 object tags are metadata for objects, not principals. The bucket policy can use 's3:ExistingObjectTag' or 's3:RequestObjectTag' conditions, but these relate to object tags, not the requester's tags.
- C
Attach an IAM policy to each user with the tag
Why wrong: This is incorrect in the context of the question, which asks for enforcing access via an S3 bucket policy. While attaching an IAM policy per user can work, it is not the approach described (it would require managing individual policies). The bucket policy is more centralized.
- D
Use S3 Object Lambda to check user tags
Why wrong: This is incorrect. S3 Object Lambda is used to transform data as it is retrieved, not to evaluate user tags for access control purposes.
DEA-C01 aws:PrincipalTag Practice Question
This DEA-C01 practice question tests your understanding of data security and governance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. A key principle to apply: aws:PrincipalTag. 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 wants to ensure that only users with a specific tag (e.g., "Department": "DataEngineering") can access an S3 bucket. How can this be enforced?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Use a bucket policy with aws:PrincipalTag condition
S3 bucket policies support condition keys like aws:PrincipalTag, which allow access control based on tags attached to IAM principals (users or roles). Option A is correct because it uses aws:PrincipalTag in the bucket policy to restrict access to users with the specific tag. Option B is incorrect because S3 object tags are for objects, not principals, and cannot be used to filter users. Option C is incorrect because attaching an IAM policy to each user is less scalable and does not leverage the bucket policy's centralized control. Option D is incorrect because S3 Object Lambda is for modifying data during retrieval, not for access control decisions.
Key principle: aws:PrincipalTag
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Use a bucket policy with aws:PrincipalTag condition
Why this is correct
This is correct. The 'aws:PrincipalTag' condition key in a bucket policy evaluates the tags attached to the IAM principal (user or role) making the request, allowing fine-grained access control based on those tags.
Related concept
aws:PrincipalTag
- ✗
Use S3 object tags and a bucket policy condition
Why it's wrong here
This is incorrect. S3 object tags are metadata for objects, not principals. The bucket policy can use 's3:ExistingObjectTag' or 's3:RequestObjectTag' conditions, but these relate to object tags, not the requester's tags.
- ✗
Attach an IAM policy to each user with the tag
Why it's wrong here
This is incorrect in the context of the question, which asks for enforcing access via an S3 bucket policy. While attaching an IAM policy per user can work, it is not the approach described (it would require managing individual policies). The bucket policy is more centralized.
- ✗
Use S3 Object Lambda to check user tags
Why it's wrong here
This is incorrect. S3 Object Lambda is used to transform data as it is retrieved, not to evaluate user tags for access control purposes.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Be careful not to confuse principal tags with resource tags. The condition 'aws:PrincipalTag' checks the requester's IAM user/role tags, while 's3:ExistingObjectTag' checks tags on the S3 object itself. This question tests the distinction.
Detailed technical explanation
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
- aws:PrincipalTag
- S3 bucket policy
- IAM user tags
- S3 object tags
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
aws:PrincipalTag
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.
Quick reference
AWS S3 Storage Class Comparison
| Storage Class | Min Duration | Retrieval | Use Case |
|---|---|---|---|
| S3 Standard | None | Immediate | Frequently accessed data |
| S3 Standard-IA | 30 days | Immediate | Infrequent access, rapid retrieval |
| S3 One Zone-IA | 30 days | Immediate | Non-critical infrequent data |
| S3 Intelligent-Tiering | None | Immediate–hours | Unknown or changing access patterns |
| S3 Glacier Instant | 90 days | Milliseconds | Archive with instant retrieval |
| S3 Glacier Flexible | 90 days | Minutes–hours | Archive, flexible retrieval |
| S3 Glacier Deep Archive | 180 days | Hours | Long-term compliance archive |
What to study next
Got this wrong? Here's your next step.
Review aws:PrincipalTag, then practise related DEA-C01 questions on the same topic to reinforce the concept.
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FAQ
Questions learners often ask
What does this DEA-C01 question test?
Data Security and Governance — This question tests Data Security and Governance — aws:PrincipalTag.
What is the correct answer to this question?
The correct answer is: Use a bucket policy with aws:PrincipalTag condition — S3 bucket policies support condition keys like aws:PrincipalTag, which allow access control based on tags attached to IAM principals (users or roles). Option A is correct because it uses aws:PrincipalTag in the bucket policy to restrict access to users with the specific tag. Option B is incorrect because S3 object tags are for objects, not principals, and cannot be used to filter users. Option C is incorrect because attaching an IAM policy to each user is less scalable and does not leverage the bucket policy's centralized control. Option D is incorrect because S3 Object Lambda is for modifying data during retrieval, not for access control decisions.
What should I do if I get this DEA-C01 question wrong?
Review aws:PrincipalTag, then practise related DEA-C01 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
aws:PrincipalTag
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Last reviewed: Jun 20, 2026
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