Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A team uses AWS CodeDeploy with a deployment configuration of CodeDeployDefault.OneAtATime to deploy a web application to an Auto Scaling group. Instances are behind an Application Load Balancer. The deployment fails with 'The overall deployment failed because too many individual instances failed deployment.' What is the most likely cause?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
The health check grace period on the Auto Scaling group is too short.
Correct. A short grace period causes instances to be considered unhealthy before the deployment finishes, triggering Auto Scaling to replace them and causing repeated failures.
B
Distractor review
The target group deregistration delay is too long.
Incorrect. Deregistration delay affects how long in-flight requests are served, but it does not cause instances to fail the deployment health check.
C
Distractor review
The CodeDeploy agent is not installed on the instances.
Incorrect. If the agent were missing, the first instance would fail immediately, not 'too many individual instances' over time.
D
Distractor review
The deployment group is configured to skip the ELB health check.
Incorrect. Skipping the ELB health check would prevent health check failures from impacting the deployment, so this would not cause the error.
Common exam trap
Common exam trap: answer the scenario, not the keyword
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.
Technical deep dive
How to think about this question
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.
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.
- Use explanations to understand the rule behind the answer.
TExam Day Tips
- Underline the problem statement mentally.
- 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.
Related practice questions
Related SOA-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A company uses Amazon CloudFront to deliver content to a global audience. The origin is an Application Load Balancer in us-east-1. The SysOps administrator wants to reduce costs by minimizing the number of requests that reach the origin server. Which action should the administrator take?
Question 2
A company runs a batch processing application on Amazon EC2 that runs for 2 hours every night. The workload can tolerate interruptions. Which EC2 purchasing option provides the lowest cost for this use case?
Question 3
A SysOps administrator needs to monitor the CPU utilization of an Amazon RDS DB instance and receive an alarm when CPU utilization exceeds 80% for 5 consecutive minutes. Which AWS service should be used to create this alarm?
Question 4
A company runs a critical web application on Amazon EC2 instances in an Auto Scaling group behind an Application Load Balancer (ALB). The application uses session stickiness (sticky sessions) to maintain user sessions. The SysOps administrator notices that when instances are replaced during a scale-in or failure event, users lose their session data. The administrator needs to preserve session data across instance failures without losing stickiness benefits. What should the administrator do?
Question 5
A company runs a production web application on a single Amazon EC2 instance. The application experiences a predictable and steady workload 24/7. The SysOps administrator wants to minimize compute costs for this instance while ensuring it remains available during the expected workload. Which EC2 purchasing option should the administrator use?
Question 6
A company has a VPC with public and private subnets. The private subnets host application servers that need to make outbound HTTPS connections to the internet. The SysOps administrator must implement a solution that provides outbound internet connectivity while preventing inbound connections from the internet. Additionally, the solution must allow the company to control which domains the application servers can access. Which solution should the administrator implement?
FAQ
Questions learners often ask
What does this SOA-C02 question test?
Read the scenario before looking for a memorised answer.
What is the correct answer to this question?
The correct answer is: The health check grace period on the Auto Scaling group is too short. — In a OneAtATime deployment, only one instance is updated at a time. If the health check grace period on the Auto Scaling group is too short, the instance may be marked unhealthy before the deployment completes, causing CodeDeploy to stop traffic to it. This can lead to cascading failures if each new instance also fails. The deregistration delay affects how long the ELB waits before stopping traffic to a deregistering instance, but it does not directly cause deployment failures. If the CodeDeploy agent is missing, the first instance would fail immediately. Skipping ELB health checks would avoid this issue entirely.
What should I do if I get this SOA-C02 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
Discussion
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