- A
The deployment group name contains a typo in the pipeline definition.
Why wrong: If there was a typo, the error would occur every time, not intermittently.
- B
The IAM role for CodePipeline does not have sufficient permissions in all regions.
Why wrong: IAM roles are region-agnostic; permissions are global. The error is about group existence, not permissions.
- C
The pipeline's cross-region action configuration references the deployment group in a different region without specifying the region.
If the pipeline uses a cross-region action and the region is not specified, it defaults to the pipeline region, which may not have the deployment group, causing intermittent failures when the region changes.
- D
The pipeline was recreated without specifying the deployment group.
Why wrong: The pipeline is not being recreated; the error occurs intermittently.
DOP-C02 SDLC Automation Practice Question
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 company uses AWS CodePipeline with an Amazon S3 source, AWS CodeBuild, and AWS CodeDeploy. The deployment stage fails intermittently with the error 'Deployment failed because the deployment group does not exist'. The pipeline has been working for months. 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 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
The pipeline's cross-region action configuration references the deployment group in a different region without specifying the region.
The intermittent failure with 'deployment group does not exist' indicates a cross-region configuration issue. When a CodePipeline action references a deployment group in a different region, the pipeline definition must explicitly specify the region for that action. If the region is omitted, CodePipeline defaults to the pipeline's home region, which may not contain the deployment group, causing intermittent failures depending on regional routing or caching.
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 deployment group name contains a typo in the pipeline definition.
Why it's wrong here
If there was a typo, the error would occur every time, not intermittently.
- ✗
The IAM role for CodePipeline does not have sufficient permissions in all regions.
Why it's wrong here
IAM roles are region-agnostic; permissions are global. The error is about group existence, not permissions.
- ✓
The pipeline's cross-region action configuration references the deployment group in a different region without specifying the region.
Why this is correct
If the pipeline uses a cross-region action and the region is not specified, it defaults to the pipeline region, which may not have the deployment group, causing intermittent failures when the region changes.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The pipeline was recreated without specifying the deployment group.
Why it's wrong here
The pipeline is not being recreated; the error occurs intermittently.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume the error is due to a typo or missing resource, but the intermittent nature points to a cross-region configuration issue where the region is not explicitly set in the action definition.
Detailed technical explanation
How to think about this question
CodePipeline's cross-region actions require the 'Region' field to be set in the action configuration; if omitted, the action executes in the same region as the pipeline. The deployment group is a regional resource, so referencing it from a different region without specifying the region causes CodePipeline to look for the group in the pipeline's region, which may not exist, leading to intermittent failures if the pipeline is re-run or if regional endpoints are load-balanced. This is a common misconfiguration when pipelines are cloned or migrated across regions.
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.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
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 pipeline's cross-region action configuration references the deployment group in a different region without specifying the region. — The intermittent failure with 'deployment group does not exist' indicates a cross-region configuration issue. When a CodePipeline action references a deployment group in a different region, the pipeline definition must explicitly specify the region for that action. If the region is omitted, CodePipeline defaults to the pipeline's home region, which may not contain the deployment group, causing intermittent failures depending on regional routing or caching.
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.
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?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jul 4, 2026
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