- A
Use Amazon Route53 weighted routing to shift traffic
Why wrong: Weighted routing can be used but is not a built-in rollback mechanism
- B
Use AWS CodeDeploy with an in-place deployment
Why wrong: In-place deployment may cause downtime and does not automatically rollback
- C
Use a blue/green deployment strategy with two S3 buckets
Blue/green allows switching traffic to the new version after validation
- D
Configure AWS CloudFormation stack with automatic rollback on failure
CloudFormation can automatically roll back changes if deployment fails
- E
Enable S3 bucket versioning to keep multiple versions
Why wrong: Versioning helps with rollback but not zero-downtime deployment
Question 1,371 of 1,750
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 a source stage from Amazon S3. The pipeline deploys a static website to an S3 bucket. The deployment must ensure that the website is always available and that rollbacks happen automatically if the deployment fails. Which TWO actions should the company take?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"always"Why it matters: Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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
✓
Use a blue/green deployment strategy with two S3 buckets
Option C is correct because a blue/green deployment strategy with two S3 buckets allows the company to maintain the current (blue) bucket serving the live website while deploying the new version to a separate (green) bucket. This ensures zero-downtime deployments and, if the deployment fails, traffic can simply remain pointed to the blue bucket, providing an automatic rollback without any manual intervention. Option D is correct because AWS CloudFormation can be configured with automatic rollback on failure, which will revert the stack to its last known good state if the deployment fails, ensuring the website remains available.
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.
- ✗
Use Amazon Route53 weighted routing to shift traffic
Why it's wrong here
Weighted routing can be used but is not a built-in rollback mechanism
- ✗
Use AWS CodeDeploy with an in-place deployment
Why it's wrong here
In-place deployment may cause downtime and does not automatically rollback
- ✓
Use a blue/green deployment strategy with two S3 buckets
Why this is correct
Blue/green allows switching traffic to the new version after validation
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure AWS CloudFormation stack with automatic rollback on failure
Why this is correct
CloudFormation can automatically roll back changes if deployment fails
Clue confirmation
The clue word "always" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Enable S3 bucket versioning to keep multiple versions
Why it's wrong here
Versioning helps with rollback but not zero-downtime deployment
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse S3 bucket versioning (Option E) with a deployment rollback strategy, but versioning only provides object-level version history and does not automate traffic switching or infrastructure rollback on failure.
Detailed technical explanation
How to think about this question
In a blue/green deployment with S3, the pipeline typically uses AWS CloudFormation to manage two stacks (blue and green) each pointing to a separate S3 bucket. The Route53 DNS record is updated via a CloudFormation custom resource or a Lambda function to switch traffic from the blue bucket to the green bucket after successful validation. CloudFormation's automatic rollback on failure works by monitoring stack creation or update events; if any resource fails to create or update, CloudFormation triggers a rollback that reverts all resources to their previous state, including the DNS record pointing back to the blue bucket, ensuring the website remains available.
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: Use a blue/green deployment strategy with two S3 buckets — Option C is correct because a blue/green deployment strategy with two S3 buckets allows the company to maintain the current (blue) bucket serving the live website while deploying the new version to a separate (green) bucket. This ensures zero-downtime deployments and, if the deployment fails, traffic can simply remain pointed to the blue bucket, providing an automatic rollback without any manual intervention. Option D is correct because AWS CloudFormation can be configured with automatic rollback on failure, which will revert the stack to its last known good state if the deployment fails, ensuring the website remains available.
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: "always". Absolute qualifier. An answer using 'always' is only correct if there are genuinely no exceptions — absolute statements are often wrong in networking.
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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