- A
Use the Lambda function's provisioned concurrency to pre-warm the new version.
Why wrong: Provisioned concurrency reduces cold starts but does not handle automatic rollback.
- B
Manually revert the alias to point back to the old version.
Why wrong: Manual rollback is slower and error-prone; automation is better.
- C
Configure the alias with a canary deployment and an error rate alarm for automatic rollback.
Canary deployment with alarm-based rollback minimizes impact.
- D
Delete the new version and redeploy after fixing the issue.
Why wrong: Deleting may cause downtime; gradual rollback is preferred.
Question 1,207 of 1,616
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. 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.
A developer is deploying a new version of a Lambda function using an alias for blue/green deployment. Traffic is gradually shifted to the new version. During the shift, a high error rate is observed. What should the developer do to minimize impact?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"minimum / minimize"Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
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
✓
Configure the alias with a canary deployment and an error rate alarm for automatic rollback.
Option C is correct because it automates the rollback process using AWS CodeDeploy's canary deployment with an Amazon CloudWatch alarm on the error rate. When the alarm triggers, CodeDeploy automatically shifts traffic back to the previous version, minimizing impact without manual intervention. This is the recommended approach for safe blue/green deployments with Lambda aliases.
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 the Lambda function's provisioned concurrency to pre-warm the new version.
Why it's wrong here
Provisioned concurrency reduces cold starts but does not handle automatic rollback.
- ✗
Manually revert the alias to point back to the old version.
Why it's wrong here
Manual rollback is slower and error-prone; automation is better.
- ✓
Configure the alias with a canary deployment and an error rate alarm for automatic rollback.
Why this is correct
Canary deployment with alarm-based rollback minimizes impact.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Delete the new version and redeploy after fixing the issue.
Why it's wrong here
Deleting may cause downtime; gradual rollback is preferred.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates may think manual reversion (Option B) is the simplest fix, but the exam emphasizes automated rollback strategies (like canary deployments with alarms) as the best practice for minimizing impact during blue/green deployments.
Detailed technical explanation
How to think about this question
Under the hood, AWS CodeDeploy uses a weighted alias to gradually shift traffic between two Lambda function versions. When you configure a canary deployment with a CloudWatch alarm, CodeDeploy monitors the error rate metric (e.g., `Errors` or `Throttles`) and, if the alarm breaches the threshold, it automatically updates the alias to point 100% to the previous version. This leverages the Lambda alias routing configuration, which supports up to two versions with traffic weights that sum to 100%.
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 cloud solutions architect for a retail company is evaluating services for a new workload. The correct answer here reflects best practice for the specific scenario described — not a general cloud recommendation. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Cloud exam questions reward reading the constraint carefully: the same technology can be right or wrong depending on the use case.
Quick reference
Cloud Service Model Comparison
| Model | You Manage | Provider Manages | Examples |
|---|---|---|---|
| IaaS | OS, runtime, apps, data | Hardware, hypervisor, networking | EC2, Azure VMs, GCP Compute Engine |
| PaaS | Apps and data | OS, runtime, middleware, hardware | Elastic Beanstalk, Azure App Service |
| SaaS | Data and settings only | Everything else | Microsoft 365, Salesforce, Workday |
| FaaS / Serverless | Function code only | Infra, scaling, runtime | Lambda, Azure Functions, Cloud Run |
| CaaS | Containers and apps | Kubernetes, OS, hardware | EKS, AKS, GKE |
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.
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Troubleshooting and Optimization — study guide chapter
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
Troubleshooting and Optimization — This question tests Troubleshooting and Optimization — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Configure the alias with a canary deployment and an error rate alarm for automatic rollback. — Option C is correct because it automates the rollback process using AWS CodeDeploy's canary deployment with an Amazon CloudWatch alarm on the error rate. When the alarm triggers, CodeDeploy automatically shifts traffic back to the previous version, minimizing impact without manual intervention. This is the recommended approach for safe blue/green deployments with Lambda aliases.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 2026
This DVA-C02 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DVA-C02 exam.
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