Quick Answer
The answer is the immutable update deployment policy. This is correct because immutable updates in AWS Elastic Beanstalk launch a completely new environment running the new application version, and if that environment fails health checks, Elastic Beanstalk automatically terminates it, leaving the original environment fully intact and serving traffic. This guarantees zero downtime and a safe, automatic rollback, directly matching the requirement to preserve the old environment upon failure. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of deployment policies that prioritize safety over speed; a common trap is confusing immutable updates with rolling updates, which update instances in-place and can still cause partial downtime or require manual rollback. Remember the key distinction: immutable means “replace the whole environment,” while rolling means “update in batches.” A useful memory tip is to think of immutable as “swap the entire house, not just the furniture.”
This DOP-C02 practice question tests your understanding of configuration management and iac. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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.
An organization uses AWS Elastic Beanstalk for application deployments. They want to implement immutable updates to minimize downtime and ensure that if the new environment fails health checks, the old environment remains intact. Which deployment policy should they choose?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Traffic splitting.
Why wrong: Traffic splitting is for canary deployments, not immutable.
Immutable update.
Immutable updates create a completely new environment and only swap when healthy.
All at once.
Why wrong: All at once replaces all instances at once, causing full downtime if it fails.
Rolling update based on health.
Why wrong: Rolling updates can cause partial downtime and do not fully preserve the old environment.
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 update.
Immutable updates in AWS Elastic Beanstalk launch a completely new environment with the new application version. If the new environment fails health checks, Elastic Beanstalk automatically terminates it, leaving the original environment untouched. This ensures zero downtime and a safe rollback, which matches the requirement to keep the old environment intact if health checks fail.
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.
Traffic splitting.
Why it's wrong here
Traffic splitting is for canary deployments, not immutable.
Immutable update.
Why this is correct
Immutable updates create a completely new environment and only swap when healthy.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
All at once.
Why it's wrong here
All at once replaces all instances at once, causing full downtime if it fails.
Rolling update based on health.
Why it's wrong here
Rolling updates can cause partial downtime and do not fully preserve the old environment.
Common exam traps
The trap here is that candidates confuse 'immutable update' with 'traffic splitting' because both involve a new environment, but traffic splitting does not automatically terminate the new environment on health check failure—it requires manual intervention or additional automation to roll back.
Detailed technical explanation
Under the hood, immutable updates use Auto Scaling groups to launch a new set of EC2 instances in a separate Auto Scaling group, then swap the environment's CNAME record to point to the new group only after all health checks pass. If health checks fail, Elastic Beanstalk performs an automatic rollback by terminating the new Auto Scaling group and keeping the original CNAME mapping. This approach is ideal for critical production workloads where even brief degradation from partial rolling updates is unacceptable.
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
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FAQ
Configuration Management and IaC — This question tests Configuration Management and IaC — Read the scenario before looking for a memorised answer..
The correct answer is: Immutable update. — Immutable updates in AWS Elastic Beanstalk launch a completely new environment with the new application version. If the new environment fails health checks, Elastic Beanstalk automatically terminates it, leaving the original environment untouched. This ensures zero downtime and a safe rollback, which matches the requirement to keep the old environment intact if health checks fail.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 11, 2026
This DOP-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 DOP-C02 exam.
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