The answer is to use AWS CodeDeploy with a canary deployment configuration. This strategy is correct because it shifts a small, defined percentage of traffic—typically 10%—to the new Lambda version, allowing you to monitor for errors before routing the remaining 90% of traffic. If errors are detected during this initial canary window, CodeDeploy can automatically trigger a rollback to the previous stable version, preventing widespread impact. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of deployment strategies for serverless applications, often appearing as a scenario where immediate rollback on error detection is required. A common trap is confusing canary with linear deployments, but linear shifts traffic in equal increments without automatic rollback, while canary explicitly supports error-driven rollbacks. Remember the memory tip: “Canary catches errors early, linear just goes steady.”
DVA-C02 Troubleshooting and Optimization Practice Question
This DVA-C02 practice question tests your understanding of troubleshooting and optimization. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 and wants to roll back immediately if errors are detected. Which deployment strategy should the developer use?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "immediately / without restart"
Why it matters: Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use AWS CodeDeploy with a canary deployment configuration
Option A is correct because canary deployments allow shifting a small percentage of traffic to the new version and monitoring before full rollout. Option B is wrong because linear deployments shift traffic in increments but do not have automatic rollback. Option C is wrong because rolling updates are for EC2, not Lambda. Option D is wrong because immutable updates replace all instances and do not support gradual traffic shifting.
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 AWS CodeDeploy with a canary deployment configuration
Why this is correct
Canary deployments allow you to route a small percentage of traffic to the new version and monitor for errors.
Clue confirmation
The clue word "immediately / without restart" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an EC2 rolling update strategy
Why it's wrong here
This is not applicable to Lambda functions.
✗
Use AWS CodeDeploy with a linear deployment configuration
Why it's wrong here
Linear deployments shift traffic in equal increments but do not automatically rollback.
✗
Use an immutable update strategy
Why it's wrong here
Immutable updates replace all instances at once and do not support gradual traffic shifting.
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.
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 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.
What to study next
Got this wrong? Here's your next step.
Identify which DVA-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.
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: Use AWS CodeDeploy with a canary deployment configuration — Option A is correct because canary deployments allow shifting a small percentage of traffic to the new version and monitoring before full rollout. Option B is wrong because linear deployments shift traffic in increments but do not have automatic rollback. Option C is wrong because rolling updates are for EC2, not Lambda. Option D is wrong because immutable updates replace all instances and do not support gradual traffic shifting.
What should I do if I get this DVA-C02 question wrong?
Identify which DVA-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: "immediately / without restart". Time or reboot constraint — the correct answer must take effect right away without requiring a reboot or reload.
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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