- A
aws s3 ls | grep my-stack
Why wrong: This lists all S3 buckets and filters for 'my-stack', but it is not reliable and not based on the CloudFormation stack.
- B
aws cloudformation describe-stack-resources --stack-name my-stack --logical-resource-id BucketName --query "StackResources[0].PhysicalResourceId" --output text
Why wrong: This command retrieves the physical resource ID of the resource with logical ID 'BucketName', which is the bucket name. However, the exhibit shows outputs, not resources. Both could work, but the question asks based on the exhibit which shows outputs. Option A is more direct given the exhibit.
- C
aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[?OutputKey=='BucketName'].OutputValue" --output text
This command correctly filters the outputs array for the OutputKey equal to 'BucketName' and returns the OutputValue as text.
- D
aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[OutputKey='BucketName'].OutputValue" --output text
Why wrong: The syntax for JMESPath filtering uses [? ...] not just brackets. This would cause an error.
Retrieve CloudFormation Stack Output with AWS CLI
This DOP-C02 practice question tests your understanding of sdlc automation. 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. 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. A CloudFormation stack has been deployed. A developer wants to use the S3 bucket name in a subsequent AWS CLI command. Which command will correctly retrieve the bucket name?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"which command"Why it matters: Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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
aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[?OutputKey=='BucketName'].OutputValue" --output text
The developer can use the --query parameter with the describe-stacks command to extract the OutputValue for the specific OutputKey 'BucketName'. Option C uses the correct JMESPath syntax with the filter [?OutputKey=='BucketName'] to select the matching output and then retrieves its OutputValue. Option A attempts to list all S3 buckets and grep for 'my-stack', which is unreliable and not the intended method. Option B uses describe-stack-resources but incorrectly assumes the bucket name is a physical resource ID when it is actually an output value. Option D uses incorrect JMESPath syntax (single bracket with equality) which is invalid.
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.
- ✗
aws s3 ls | grep my-stack
Why it's wrong here
This lists all S3 buckets and filters for 'my-stack', but it is not reliable and not based on the CloudFormation stack.
- ✗
aws cloudformation describe-stack-resources --stack-name my-stack --logical-resource-id BucketName --query "StackResources[0].PhysicalResourceId" --output text
Why it's wrong here
This command retrieves the physical resource ID of the resource with logical ID 'BucketName', which is the bucket name. However, the exhibit shows outputs, not resources. Both could work, but the question asks based on the exhibit which shows outputs. Option A is more direct given the exhibit.
- ✓
aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[?OutputKey=='BucketName'].OutputValue" --output text
Why this is correct
This command correctly filters the outputs array for the OutputKey equal to 'BucketName' and returns the OutputValue as text.
Clue confirmation
The clue word "which command" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[OutputKey='BucketName'].OutputValue" --output text
Why it's wrong here
The syntax for JMESPath filtering uses [? ...] not just brackets. This would cause an error.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Trap categories for this question
Command / output trap
This command retrieves the physical resource ID of the resource with logical ID 'BucketName', which is the bucket name. However, the exhibit shows outputs, not resources. Both could work, but the question asks based on the exhibit which shows outputs. Option A is more direct given the exhibit.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
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.
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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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: aws cloudformation describe-stacks --stack-name my-stack --query "Stacks[0].Outputs[?OutputKey=='BucketName'].OutputValue" --output text — The developer can use the --query parameter with the describe-stacks command to extract the OutputValue for the specific OutputKey 'BucketName'. Option C uses the correct JMESPath syntax with the filter [?OutputKey=='BucketName'] to select the matching output and then retrieves its OutputValue. Option A attempts to list all S3 buckets and grep for 'my-stack', which is unreliable and not the intended method. Option B uses describe-stack-resources but incorrectly assumes the bucket name is a physical resource ID when it is actually an output value. Option D uses incorrect JMESPath syntax (single bracket with equality) which is invalid.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Are there clue words in this question I should notice?
Yes — watch for: "which command". Tests specific CLI syntax. Recall the exact command and its required context — near-synonyms and partial matches are common distractors.
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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