Difference Between S3 ListBucket and ListObjects Permissions
This SCS-C02 practice question tests your understanding of identity and access 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. A key principle to apply: s3:ListBucket. 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.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The instance can list objects in the bucket
The bucket policy grants `s3:ListBucket` action, which allows listing the objects in the bucket (i.e., the `ListObjects` API). The EC2 instance with that role can therefore list objects in the bucket. However, to upload objects, `s3:PutObject` would be required, which is not granted. Thus, option D is correct.
Key principle: s3:ListBucket
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The instance can list the bucket but not the objects
Why it's wrong here
Incorrect. The `s3:ListBucket` action actually permits listing objects (ListObjects API), so the instance can list objects in the bucket.
✗
The instance cannot assume the role because the principal is ec2.amazonaws.com
Why it's wrong here
Incorrect. The principal `ec2.amazonaws.com` is allowed to assume the role; there is no issue with the principal.
✗
The instance can upload objects to the bucket
Why it's wrong here
Incorrect. The policy does not grant `s3:PutObject`, so the instance cannot upload objects.
✓
The instance can list objects in the bucket
Why this is correct
Correct. The `s3:ListBucket` action allows listing the objects in the bucket.
Related concept
s3:ListBucket
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often mistakenly believe that `s3:ListBucket` only allows listing the bucket itself (e.g., in a list of buckets) rather than understanding it grants the `ListObjects` API on the bucket.
Detailed technical explanation
How to think about this question
S3 permissions are divided into bucket-level actions (e.g., `s3:ListBucket`, `s3:GetBucketLocation`) and object-level actions (e.g., `s3:GetObject`, `s3:PutObject`, `s3:ListObjects`). The `s3:ListBucket` action only returns the bucket's metadata and a list of object keys if the request is a GET on the bucket endpoint, but it does not grant access to the objects themselves. This distinction is critical when designing least-privilege policies, as granting `s3:ListBucket` alone can leak object key names but not object content.
KKey Concepts to Remember
s3:ListBucket
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:ListBucket
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 s3:ListBucket, then practise related SCS-C02 questions on the same topic to reinforce the concept.
Identity and Access Management — This question tests Identity and Access Management — s3:ListBucket.
What is the correct answer to this question?
The correct answer is: The instance can list objects in the bucket — The bucket policy grants `s3:ListBucket` action, which allows listing the objects in the bucket (i.e., the `ListObjects` API). The EC2 instance with that role can therefore list objects in the bucket. However, to upload objects, `s3:PutObject` would be required, which is not granted. Thus, option D is correct.
What should I do if I get this SCS-C02 question wrong?
Review s3:ListBucket, then practise related SCS-C02 questions on the same topic to reinforce the concept.
What is the key concept behind this question?
s3:ListBucket
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Question Discussion
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