This DOP-C02 practice question tests your understanding of sdlc automation. 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.
A DevOps engineer is creating a CodePipeline service role. The above IAM policy is attached to the role. The pipeline fails when trying to download artifacts from the S3 bucket. What is the issue?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The policy is missing s3:ListBucket permission on the bucket.
The pipeline fails because the IAM policy grants s3:GetObject on the object ARN but lacks s3:ListBucket on the bucket ARN. CodePipeline's S3 artifact download action first calls ListBucket to verify the bucket exists and the object key is accessible before performing the GetObject call. Without s3:ListBucket, the initial validation fails, causing the pipeline to error out even though GetObject is allowed.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 Resource for S3 actions should be the bucket ARN, not the object ARN.
Why it's wrong here
The object ARN is correct for object-level operations.
✓
The policy is missing s3:ListBucket permission on the bucket.
Why this is correct
ListBucket is required to list objects in the bucket.
Related concept
Read the scenario before looking for a memorised answer.
✗
The CodeDeploy actions require a specific resource ARN instead of '*'.
Why it's wrong here
'*' is acceptable for CodeDeploy actions that are not resource-specific.
✗
The Action list is missing s3:GetObjectVersion.
Why it's wrong here
If versioning is not used, GetObjectVersion is not required.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates assume only s3:GetObject is needed for downloading artifacts, overlooking that CodePipeline's S3 action internally requires s3:ListBucket to resolve the object location before retrieval.
Detailed technical explanation
How to think about this question
Under the hood, CodePipeline uses the S3 GetObject API to download artifacts, but the AWS SDK or CLI first performs a HeadBucket or ListObjectsV2 call to validate the bucket and key path. Without s3:ListBucket, the pipeline receives an AccessDenied error during the validation step, which is logged as a 'permission denied' failure. In real-world scenarios, this often occurs when engineers grant only object-level permissions (s3:GetObject) and forget the bucket-level list permission, especially when using cross-account S3 buckets where bucket policies also require explicit ListBucket grants.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
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
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The policy is missing s3:ListBucket permission on the bucket. — The pipeline fails because the IAM policy grants s3:GetObject on the object ARN but lacks s3:ListBucket on the bucket ARN. CodePipeline's S3 artifact download action first calls ListBucket to verify the bucket exists and the object key is accessible before performing the GetObject call. Without s3:ListBucket, the initial validation fails, causing the pipeline to error out even though GetObject is allowed.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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