This DOP-C02 practice question tests your understanding of configuration management and iac. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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. They have a production stack that creates an Auto Scaling group. They want to update the launch configuration to use a new Amazon Machine Image (AMI) ID without causing downtime. Which update policy should they set on the Auto Scaling group?
AutoScalingScheduledAction
Why wrong: ScheduledAction is for scaling based on time, not for updates.
AutoScalingReplacingUpdate
Why wrong: Replaces the entire group, causing potential downtime.
AutoScalingRollingUpdate
Rolling update updates instances in batches, minimizing downtime.
AutoScalingBatchUpdate
Why wrong: No such update policy exists in CloudFormation.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
AutoScalingRollingUpdate
Option C is correct because the AutoScalingRollingUpdate policy allows CloudFormation to update the Auto Scaling group's launch configuration by gradually replacing instances in batches, ensuring that a minimum number of instances remain in service throughout the update. This prevents downtime by terminating old instances and launching new ones with the updated AMI in a controlled, rolling fashion.
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.
AutoScalingScheduledAction
Why it's wrong here
ScheduledAction is for scaling based on time, not for updates.
AutoScalingReplacingUpdate
Why it's wrong here
Replaces the entire group, causing potential downtime.
AutoScalingRollingUpdate
Why this is correct
Rolling update updates instances in batches, minimizing downtime.
Related concept
Read the scenario before looking for a memorised answer.
AutoScalingBatchUpdate
Why it's wrong here
No such update policy exists in CloudFormation.
Common exam traps
The trap here is that candidates often confuse 'AutoScalingReplacingUpdate' (a non-existent policy) with the actual 'AutoScalingRollingUpdate' policy, or they mistakenly think 'AutoScalingScheduledAction' can handle launch configuration updates, when it only manages scheduled scaling events.
Detailed technical explanation
Under the hood, the AutoScalingRollingUpdate policy uses the 'MinInstancesInService' and 'MaxBatchSize' parameters to control the number of instances replaced per batch and the minimum healthy instance count. For example, setting MinInstancesInService=2 and MaxBatchSize=1 ensures that at least two instances remain operational while one instance is terminated and replaced, preventing total capacity loss. This is critical for stateful applications or when the new AMI introduces breaking changes that require careful validation.
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: AutoScalingRollingUpdate — Option C is correct because the AutoScalingRollingUpdate policy allows CloudFormation to update the Auto Scaling group's launch configuration by gradually replacing instances in batches, ensuring that a minimum number of instances remain in service throughout the update. This prevents downtime by terminating old instances and launching new ones with the updated AMI in a controlled, rolling fashion.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 24, 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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