This DOP-C02 practice question tests your understanding of sdlc automation. 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.
A company uses AWS CodeDeploy to deploy a web application to an Auto Scaling group. After a deployment, some instances fail the health check and are terminated by the Auto Scaling group. What should the DevOps engineer do to prevent this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Update the deployment group to use an Elastic Load Balancer and configure health checks.
Option C is correct because configuring an Elastic Load Balancer (ELB) with health checks in the CodeDeploy deployment group allows CodeDeploy to monitor instance health during deployment. If an instance fails the ELB health check, CodeDeploy can automatically roll back or stop the deployment, preventing the Auto Scaling group from terminating unhealthy instances. This integrates the deployment lifecycle with load balancer health signals, ensuring only healthy instances serve traffic.
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.
✗
Configure a CloudWatch alarm to stop the deployment if instances are unhealthy.
Why it's wrong here
CloudWatch alarms can monitor but not automatically fix the issue.
✗
Modify the deployment configuration to deploy to only one instance at a time.
Why it's wrong here
This does not address the health check failure.
✓
Update the deployment group to use an Elastic Load Balancer and configure health checks.
Why this is correct
ELB health checks automatically replace unhealthy instances and work with CodeDeploy.
Related concept
Read the scenario before looking for a memorised answer.
✗
Increase the desired capacity of the Auto Scaling group to tolerate failures.
Why it's wrong here
This only masks the problem, not prevents it.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse Auto Scaling group health checks (which terminate instances) with CodeDeploy's deployment health checks (which can stop or roll back deployments), leading them to choose options that only address symptoms rather than integrating the two services properly.
Detailed technical explanation
How to think about this question
Under the hood, CodeDeploy uses the ELB's health check endpoint (e.g., HTTP 200 on a specific path) to determine instance health. When an instance fails, CodeDeploy can automatically reroute traffic away from it and initiate a rollback. In real-world scenarios, this is critical for blue/green deployments where traffic shifting must be gated by health checks to avoid serving errors to users.
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.
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: Update the deployment group to use an Elastic Load Balancer and configure health checks. — Option C is correct because configuring an Elastic Load Balancer (ELB) with health checks in the CodeDeploy deployment group allows CodeDeploy to monitor instance health during deployment. If an instance fails the ELB health check, CodeDeploy can automatically roll back or stop the deployment, preventing the Auto Scaling group from terminating unhealthy instances. This integrates the deployment lifecycle with load balancer health signals, ensuring only healthy instances serve traffic.
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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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.
Question Discussion
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