- A
Create an Auto Scaling group with the instance in multiple Availability Zones
An Auto Scaling group with instances in multiple AZs and a desired capacity of 1 will automatically launch a new instance in another AZ if the existing one fails.
- B
Create a placement group and launch the instance in it
Why wrong: Placement groups control the physical placement of instances but do not provide automatic replacement or recovery.
- C
Place the instance behind an Elastic Load Balancer
Why wrong: An Elastic Load Balancer distributes incoming traffic, but it does not automatically launch new instances.
- D
Configure an Amazon Route 53 health check with failover routing
Why wrong: Amazon Route 53 health checks can reroute traffic away from a failed endpoint but cannot provision new EC2 instances.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 runs a critical application on a single Amazon EC2 instance. The SysOps administrator needs to ensure that if the instance fails, a new instance is automatically provisioned in a different Availability Zone. Which configuration should the administrator implement?
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 an Auto Scaling group with the instance in multiple Availability Zones
Option A is correct because an Auto Scaling group (ASG) can be configured with a minimum, desired, and maximum size of 1, spanning multiple Availability Zones (AZs). When the EC2 instance fails, the ASG health check replacement mechanism automatically terminates the unhealthy instance and launches a new one in a different AZ, ensuring the application remains available across AZ boundaries without manual intervention.
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 an Auto Scaling group with the instance in multiple Availability Zones
Why this is correct
An Auto Scaling group with instances in multiple AZs and a desired capacity of 1 will automatically launch a new instance in another AZ if the existing one fails.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
Create a placement group and launch the instance in it
Why it's wrong here
Placement groups control the physical placement of instances but do not provide automatic replacement or recovery.
- ✗
Place the instance behind an Elastic Load Balancer
Why it's wrong here
An Elastic Load Balancer distributes incoming traffic, but it does not automatically launch new instances.
- ✗
Configure an Amazon Route 53 health check with failover routing
Why it's wrong here
Amazon Route 53 health checks can reroute traffic away from a failed endpoint but cannot provision new EC2 instances.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse the health-check and failover capabilities of Route 53 or ELB with the automatic instance provisioning provided by Auto Scaling groups, mistakenly thinking DNS or load balancer health checks alone can replace a failed instance.
Detailed technical explanation
How to think about this question
Under the hood, an Auto Scaling group uses EC2 health checks (status checks) or custom ELB health checks to determine instance health. When an instance fails, the ASG's termination policy (e.g., 'Default' which selects the AZ with the most instances) and the 'ReplaceUnhealthy' process trigger a new instance launch in a different AZ if the ASG spans multiple AZs. This behavior is governed by the ASG's 'HealthCheckGracePeriod' (default 300 seconds) and the 'HealthCheckType' parameter, which can be set to 'EC2' or 'ELB'.
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
An e-commerce site experiences heavy traffic on Black Friday and near-zero traffic during off-peak weeks. Rather than provisioning permanent large VMs, the team uses auto-scaling groups that add capacity automatically under load and reduce it overnight. Questions like this test whether you understand elasticity, availability zones, and cloud compute scaling patterns.
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.
- →
Reliability and Business Continuity — study guide chapter
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
Reliability and Business Continuity — This question tests Reliability and Business Continuity — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Create an Auto Scaling group with the instance in multiple Availability Zones — Option A is correct because an Auto Scaling group (ASG) can be configured with a minimum, desired, and maximum size of 1, spanning multiple Availability Zones (AZs). When the EC2 instance fails, the ASG health check replacement mechanism automatically terminates the unhealthy instance and launches a new one in a different AZ, ensuring the application remains available across AZ boundaries without manual intervention.
What should I do if I get this SOA-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: Jun 11, 2026
This SOA-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 SOA-C02 exam.
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