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.
Which TWO deployment methods can be used to update an AWS Lambda function with no downtime? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a weighted alias to gradually shift traffic to a new version.
Option B is correct because a weighted alias allows you to route a small percentage of traffic to a new Lambda version while keeping the majority on the current version, enabling canary deployments with zero downtime. Option C is correct because creating a new version and updating the alias to point to it performs an instant, atomic switch, ensuring all traffic is served by the new version without any interruption.
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.
✗
Update the function code using update-function-code.
Why it's wrong here
Direct update causes brief downtime.
✓
Use a weighted alias to gradually shift traffic to a new version.
Why this is correct
Canary deployment with no downtime.
Related concept
Read the scenario before looking for a memorised answer.
✓
Create a new version and update the alias to point to the new version.
Why this is correct
Alias switch is atomic.
Related concept
Read the scenario before looking for a memorised answer.
✗
Create a new Lambda function and delete the old one.
Why it's wrong here
Causes downtime during deletion.
✗
Update the function configuration to increase memory.
Why it's wrong here
Does not update code.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think update-function-code is a safe deployment method, but it modifies the mutable $LATEST version, which can cause downtime if an alias points to $LATEST and the update is not atomic.
Detailed technical explanation
How to think about this question
Under the hood, Lambda versions are immutable snapshots of code and configuration, and aliases are pointers to specific versions that can be updated atomically. Weighted aliases use a traffic-shifting mechanism where the Lambda service distributes invocations based on the configured weights, allowing you to monitor errors and roll back instantly by adjusting the weights. In a real-world scenario, you might use a weighted alias to gradually shift 5% of traffic to a new version, monitor for increased error rates or latency, and then shift 100% once validated, all without any client-side changes.
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.
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: Use a weighted alias to gradually shift traffic to a new version. — Option B is correct because a weighted alias allows you to route a small percentage of traffic to a new Lambda version while keeping the majority on the current version, enabling canary deployments with zero downtime. Option C is correct because creating a new version and updating the alias to point to it performs an instant, atomic switch, ensuring all traffic is served by the new version without any interruption.
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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