- A
Create a new Auto Scaling group with the new instance type and attach it to the load balancer, then delete the old group.
Blue/green deployment avoids downtime.
- B
Modify the RDS instance type to match the new EC2 instance type for consistency.
Why wrong: RDS instance type is independent of EC2 instance type.
- C
Update the Auto Scaling group's launch template or launch configuration to specify the new instance type.
The launch template defines the instance type for new instances.
- D
Terminate all instances in the Auto Scaling group before updating the launch configuration.
Why wrong: Terminating all instances causes downtime.
- E
Perform a rolling update with a batch size of 1 and a pause time.
Rolling update with small batches minimizes impact.
Question 1,107 of 1,750
DOP-C02 SDLC Automation Practice Question
This DOP-C02 practice question tests your understanding of sdlc automation. 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 DevOps team is using AWS CloudFormation to deploy a three-tier web application. The stack includes an Application Load Balancer, an Auto Scaling group, and an RDS database. They want to update the stack to change the instance type of the Auto Scaling group without downtime. Which three steps should they take? (Choose THREE.)
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
✓
Create a new Auto Scaling group with the new instance type and attach it to the load balancer, then delete the old group.
Option A is correct because creating a new Auto Scaling group with the new instance type and attaching it to the same Application Load Balancer allows traffic to be gradually shifted to the new instances without interrupting existing connections. Once the new group is healthy and serving traffic, the old group can be safely deleted, achieving a zero-downtime migration. This approach avoids modifying the existing Auto Scaling group's launch configuration while it is still running instances.
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.
- ✓
Create a new Auto Scaling group with the new instance type and attach it to the load balancer, then delete the old group.
Why this is correct
Blue/green deployment avoids downtime.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Modify the RDS instance type to match the new EC2 instance type for consistency.
Why it's wrong here
RDS instance type is independent of EC2 instance type.
- ✓
Update the Auto Scaling group's launch template or launch configuration to specify the new instance type.
Why this is correct
The launch template defines the instance type for new instances.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Terminate all instances in the Auto Scaling group before updating the launch configuration.
Why it's wrong here
Terminating all instances causes downtime.
- ✓
Perform a rolling update with a batch size of 1 and a pause time.
Why this is correct
Rolling update with small batches minimizes impact.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often think they must terminate all instances first (Option D) or modify unrelated resources like RDS (Option B), when in fact AWS supports multiple strategies (new ASG + ALB swap or rolling update) that avoid downtime entirely.
Detailed technical explanation
How to think about this question
Under the hood, the Application Load Balancer uses target groups to route traffic to registered instances. By attaching the new Auto Scaling group to the same target group, you can leverage the ALB's connection draining feature (default 300 seconds) to gracefully shift traffic. The rolling update in Option E uses CloudFormation's UpdatePolicy with AutoScalingRollingUpdate, which replaces instances one at a time (batch size 1) and waits for health checks before proceeding, ensuring no more than one instance is unavailable at any moment.
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 media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
SDLC Automation — This question tests SDLC Automation — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create a new Auto Scaling group with the new instance type and attach it to the load balancer, then delete the old group. — Option A is correct because creating a new Auto Scaling group with the new instance type and attaching it to the same Application Load Balancer allows traffic to be gradually shifted to the new instances without interrupting existing connections. Once the new group is healthy and serving traffic, the old group can be safely deleted, achieving a zero-downtime migration. This approach avoids modifying the existing Auto Scaling group's launch configuration while it is still running instances.
What should I do if I get this DOP-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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Last reviewed: Jul 4, 2026
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