DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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.
Network Topology
A company configures AWS CloudTrail to deliver logs to S3 bucket 'my-app-logs'. However, no log files appear. The DevOps engineer runs the above command and sees the bucket policy. What is the issue?
Network Topology
A
The bucket policy requires bucket-owner-full-control ACL, but CloudTrail does not support ACLs.
Why wrong: CloudTrail supports the ACL condition.
B
The bucket policy does not allow the s3:PutObject action.
Why wrong: The policy does allow PutObject.
C
The service principal in the bucket policy is incorrect; it should be 'cloudtrail.amazonaws.com'.
CloudTrail requires its own service principal.
D
The bucket does not exist; the policy retrieval failed silently.
Why wrong: The policy was retrieved successfully, so the bucket exists.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The service principal in the bucket policy is incorrect; it should be 'cloudtrail.amazonaws.com'.
Option C is correct because CloudTrail requires the S3 bucket policy to grant the service principal 'cloudtrail.amazonaws.com' for delivering logs. The bucket policy shown likely contains 'delivery.logs.amazonaws.com' which is incorrect and prevents log delivery. Option A is wrong because the policy does allow s3:PutObject. Option B is wrong because CloudTrail can deliver to buckets with various ACL settings as long as the policy is correct. Option D is wrong because the bucket exists and the policy retrieval succeeded.
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 bucket policy requires bucket-owner-full-control ACL, but CloudTrail does not support ACLs.
The bucket policy does not allow the s3:PutObject action.
Why it's wrong here
The policy does allow PutObject.
✓
The service principal in the bucket policy is incorrect; it should be 'cloudtrail.amazonaws.com'.
Why this is correct
CloudTrail requires its own service principal.
Related concept
Standard ACLs match source addresses.
✗
The bucket does not exist; the policy retrieval failed silently.
Why it's wrong here
The policy was retrieved successfully, so the bucket exists.
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.
Visual reference
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 DOP-C02 ACL questions on filtering logic and placement.
Incident and Event Response — This question tests Incident and Event Response — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: The service principal in the bucket policy is incorrect; it should be 'cloudtrail.amazonaws.com'. — Option C is correct because CloudTrail requires the S3 bucket policy to grant the service principal 'cloudtrail.amazonaws.com' for delivering logs. The bucket policy shown likely contains 'delivery.logs.amazonaws.com' which is incorrect and prevents log delivery. Option A is wrong because the policy does allow s3:PutObject. Option B is wrong because CloudTrail can deliver to buckets with various ACL settings as long as the policy is correct. Option D is wrong because the bucket exists and the policy retrieval succeeded.
What should I do if I get this DOP-C02 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 DOP-C02 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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