Quick Answer
The answer is immutable deployment, which is the correct choice for achieving zero downtime when deploying a new version of a Node.js application on AWS Elastic Beanstalk. Immutable deployment works by launching a completely new set of instances in a separate Auto Scaling group, deploying the new application version to them, and then swapping the environment’s CNAME record to point to the new group—all without affecting the existing instances until the swap is complete. On the AWS Certified Developer Associate DVA-C02 exam, this question tests your understanding of deployment policies and their impact on availability; a common trap is confusing “rolling with additional batch” with true zero-downtime, but only immutable guarantees no capacity reduction or service interruption. Remember the memory tip: “Immutable means untouchable—old instances stay untouched until the new fleet is ready, then the CNAME flips.”
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 development team uses AWS Elastic Beanstalk for a Node.js application. They want to deploy a new version with zero downtime. Which deployment policy should they choose?
Immutable
Launches new instances and swaps CNAME, zero downtime.
All at once
Why wrong: Causes downtime as all instances are updated simultaneously.
Rolling
Why wrong: Updates instances in batches; may reduce capacity.
Rolling with additional batch
Why wrong: Similar to rolling, not true zero downtime.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
Immutable
The correct answer is C. Immutable deployment launches new instances in a new Auto Scaling group, then swaps the CNAME, ensuring zero downtime. Option A (All at once) causes downtime. Option B (Rolling) has a brief window with old and new versions but may reduce capacity. Option D (Rolling with additional batch) is similar to rolling but adds instances, still not zero downtime.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Immutable
Why this is correct
Launches new instances and swaps CNAME, zero downtime.
Related concept
Read the scenario before looking for a memorised answer.
All at once
Why it's wrong here
Causes downtime as all instances are updated simultaneously.
Rolling
Why it's wrong here
Updates instances in batches; may reduce capacity.
Rolling with additional batch
Why it's wrong here
Similar to rolling, not true zero downtime.
Common exam traps
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.
Trap categories for this question
Similar concept trap
Similar to rolling, not true zero downtime.
Detailed technical explanation
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.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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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FAQ
Deployment — This question tests Deployment — Read the scenario before looking for a memorised answer..
The correct answer is: Immutable — The correct answer is C. Immutable deployment launches new instances in a new Auto Scaling group, then swaps the CNAME, ensuring zero downtime. Option A (All at once) causes downtime. Option B (Rolling) has a brief window with old and new versions but may reduce capacity. Option D (Rolling with additional batch) is similar to rolling but adds instances, still not zero downtime.
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.
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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