- A
Create a change set and execute it after the current stack is deleted.
Why wrong: Deleting the stack causes downtime; change sets are applied to existing stacks.
- B
Update the CloudFormation stack with the new function code and deploy the stack update.
CloudFormation updates handle resource replacement; using Lambda aliases can ensure zero downtime.
- C
Manually update the Lambda function code in the console and then update the stack.
Why wrong: Manual updates diverge from CloudFormation; the stack would not reflect the changes and next update could overwrite.
- D
Create a new CloudFormation stack for the new function and delete the old stack.
Why wrong: This causes downtime during switchover and does not use CloudFormation's update mechanism.
Question 200 of 1,616
Update Lambda Function Without Downtime in CloudFormation
This DVA-C02 practice question tests your understanding of deployment. 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 company uses AWS CloudFormation to manage infrastructure. The development team wants to deploy a new version of a Lambda function without downtime. The function is part of a stack. Which action should the team take?
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
✓
Update the CloudFormation stack with the new function code and deploy the stack update.
Updating the CloudFormation stack with the new Lambda function code and deploying the stack update is the correct approach because CloudFormation performs a rolling update on the Lambda function, replacing the old version with the new one without deleting the stack. This ensures zero downtime as the update is applied in place, and the function remains available throughout the process.
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.
- ✗
Create a change set and execute it after the current stack is deleted.
Why it's wrong here
Deleting the stack causes downtime; change sets are applied to existing stacks.
- ✓
Update the CloudFormation stack with the new function code and deploy the stack update.
Why this is correct
CloudFormation updates handle resource replacement; using Lambda aliases can ensure zero downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Manually update the Lambda function code in the console and then update the stack.
Why it's wrong here
Manual updates diverge from CloudFormation; the stack would not reflect the changes and next update could overwrite.
- ✗
Create a new CloudFormation stack for the new function and delete the old stack.
Why it's wrong here
This causes downtime during switchover and does not use CloudFormation's update mechanism.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates mistakenly think manual changes (Option C) or creating a new stack (Option D) are safer, but CloudFormation's stack update is designed for zero-downtime deployments, and manual edits cause drift that CloudFormation will revert.
Detailed technical explanation
How to think about this question
CloudFormation stack updates use a change set to orchestrate resource modifications, and for Lambda functions, the update replaces the function code by publishing a new version while keeping the existing alias (if configured) pointing to the old version until the update completes, ensuring no interruption. In real-world scenarios, teams often combine this with Lambda aliases and traffic shifting to gradually route traffic to the new version, but a direct stack update without aliases still avoids downtime because the function's ARN remains the same and invocations are handled seamlessly.
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.
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FAQ
Questions learners often ask
What does this DVA-C02 question test?
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: Update the CloudFormation stack with the new function code and deploy the stack update. — Updating the CloudFormation stack with the new Lambda function code and deploying the stack update is the correct approach because CloudFormation performs a rolling update on the Lambda function, replacing the old version with the new one without deleting the stack. This ensures zero downtime as the update is applied in place, and the function remains available throughout the process.
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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Last reviewed: Jul 4, 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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