- A
The IAM execution role for the Lambda function does not have permission to invoke the new version.
Why wrong: Permissions are not version-specific; if the alias points to the new version, it should work.
- B
The alias was not updated to point to the new version after deployment.
An alias is a pointer to a specific version. If the alias still points to the old version, new invocations will use the old code.
- C
The Lambda function's reserved concurrency is set to 0, preventing new invocations.
Why wrong: Reserved concurrency of 0 would cause throttling, not invocation of old version.
- D
The function name in the invocation request is different from the deployed function.
Why wrong: If the function name is different, the invocation would fail with ResourceNotFoundException.
Why Does My Lambda Function Keep Invoking the Old Version After Deployment?
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 deployed a new version of a Lambda function using an alias that points to the new version. However, the function continues to invoke the old version. What is the MOST likely cause?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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
The alias was not updated to point to the new version after deployment.
Option B is correct because if the alias is not updated to point to the new version, it still invokes the old version. Option A is incorrect because IAM execution role permissions do not affect which version is invoked; they affect whether the function can be invoked at all. Option C is incorrect because reserved concurrency set to 0 would cause throttle errors, not invocation of old code. Option D is incorrect because a different function name would result in a resource not found error, not invoking old code.
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.
- ✗
The IAM execution role for the Lambda function does not have permission to invoke the new version.
Why it's wrong here
Permissions are not version-specific; if the alias points to the new version, it should work.
- ✓
The alias was not updated to point to the new version after deployment.
Why this is correct
An alias is a pointer to a specific version. If the alias still points to the old version, new invocations will use the old code.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The Lambda function's reserved concurrency is set to 0, preventing new invocations.
Why it's wrong here
Reserved concurrency of 0 would cause throttling, not invocation of old version.
- ✗
The function name in the invocation request is different from the deployed function.
Why it's wrong here
If the function name is different, the invocation would fail with ResourceNotFoundException.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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 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.
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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: The alias was not updated to point to the new version after deployment. — Option B is correct because if the alias is not updated to point to the new version, it still invokes the old version. Option A is incorrect because IAM execution role permissions do not affect which version is invoked; they affect whether the function can be invoked at all. Option C is incorrect because reserved concurrency set to 0 would cause throttle errors, not invocation of old code. Option D is incorrect because a different function name would result in a resource not found error, not invoking old code.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 20, 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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