PAS-C01 Operations and Maintenance Practice Question
This PAS-C01 practice question tests your understanding of operations and maintenance. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
Refer to the exhibit. An SAP administrator has created this IAM policy for a backup user. The user can list and download backups but cannot delete them. However, the user is unable to list the objects in the bucket. What is the most likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
There is an additional bucket policy that denies s3:ListBucket to this user.
The IAM policy shown grants s3:ListBucket permission on the bucket, so the user should be able to list objects. However, the user cannot list objects, indicating an additional bucket policy explicitly denies s3:ListBucket for this user. Bucket policies override IAM permissions when a Deny is present. Option A is incorrect because the policy does include s3:ListBucket. Option C is incorrect because s3:GetObjectVersion is not required to list objects. Option D is incorrect because the Deny statement only affects s3:DeleteObject, not s3:ListBucket.
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.
✗
The IAM policy does not include s3:ListBucket for the bucket.
Why it's wrong here
Incorrect. The IAM policy explicitly includes s3:ListBucket for the bucket, so this is not the cause.
✓
There is an additional bucket policy that denies s3:ListBucket to this user.
Why this is correct
Correct. The user has the necessary IAM permissions to list, so the inability to list must be due to a bucket policy that denies s3:ListBucket.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Standard ACLs match source addresses.
✗
The user needs s3:GetObjectVersion permission to list objects.
Why it's wrong here
Incorrect. s3:GetObjectVersion is used to retrieve a specific version of an object, not to list objects.
✗
The Deny statement also denies s3:ListBucket because of the wildcard resource.
Why it's wrong here
Incorrect. The Deny statement only denies s3:DeleteObject, not s3:ListBucket. The wildcard resource does not affect ListBucket.
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.
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 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 PAS-C01 ACL questions on filtering logic and placement.
Operations and Maintenance — This question tests Operations and Maintenance — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: There is an additional bucket policy that denies s3:ListBucket to this user. — The IAM policy shown grants s3:ListBucket permission on the bucket, so the user should be able to list objects. However, the user cannot list objects, indicating an additional bucket policy explicitly denies s3:ListBucket for this user. Bucket policies override IAM permissions when a Deny is present. Option A is incorrect because the policy does include s3:ListBucket. Option C is incorrect because s3:GetObjectVersion is not required to list objects. Option D is incorrect because the Deny statement only affects s3:DeleteObject, not s3:ListBucket.
What should I do if I get this PAS-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 PAS-C01 ACL questions on filtering logic and placement.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Standard ACLs match source addresses.
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