This DVA-C02 practice question tests your understanding of deployment. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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 CodeDeploy deployment to Lambda should shift 10 percent of traffic for 10 minutes before full rollout and automatically roll back on alarms. Which configuration should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Canary deployment preference with CloudWatch alarms
A is correct because CodeDeploy's canary deployment preference shifts 10% of traffic to the new Lambda version for 10 minutes, then automatically shifts the remaining 90% after the specified interval. CloudWatch alarms are configured to trigger an automatic rollback if the alarm state is breached during the canary period, meeting the requirement for a gradual shift with automated rollback on failure.
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.
✓
Canary deployment preference with CloudWatch alarms
Why this is correct
Correct for the stated requirement.
Related concept
Read the scenario before looking for a memorised answer.
✗
All-at-once deployment without alarms
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✗
Manual alias update after deployment
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
✗
S3 static website deployment
Why it's wrong here
This does not meet the stated requirement as directly as the correct option.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may confuse 'canary' with 'linear' deployments, or assume that any gradual shift (like 'linear10PercentEvery10Minutes') is equivalent, but the requirement specifies a single 10% shift for 10 minutes before full rollout, which matches the canary preference, not a linear incremental shift.
Detailed technical explanation
How to think about this question
CodeDeploy's canary deployment uses the Lambda alias to route traffic between two versions: the original (serving 90%) and the new (serving 10%). After the canary interval, CodeDeploy automatically updates the alias to route 100% traffic to the new version. CloudWatch alarms integrated with CodeDeploy can trigger a rollback by reverting the alias to the previous version if metrics like error rate or latency breach thresholds, ensuring minimal impact during the gradual shift.
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.
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.
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Canary deployment preference with CloudWatch alarms — A is correct because CodeDeploy's canary deployment preference shifts 10% of traffic to the new Lambda version for 10 minutes, then automatically shifts the remaining 90% after the specified interval. CloudWatch alarms are configured to trigger an automatic rollback if the alarm state is breached during the canary period, meeting the requirement for a gradual shift with automated rollback on failure.
What should I do if I get this DVA-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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