The correct answer is to configure the ALB to be internet-facing and enable cross-zone load balancing, and to configure the Auto Scaling group to span multiple Availability Zones. Enabling cross-zone load balancing allows the ALB to distribute incoming traffic evenly across all registered targets in all enabled AZs, meaning if one AZ fails, the load balancer can still route requests to healthy instances in other zones. Meanwhile, distributing the Auto Scaling group across multiple AZs ensures that EC2 instances are provisioned in separate failure domains, so an AZ outage does not wipe out the entire application fleet. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this pair of steps tests your understanding that high availability requires both a load balancer that can reach across zones and a compute layer that is physically spread out. A common trap is thinking that increasing the minimum instance size in a single AZ or using a single instance type provides resilience—it does not. Memory tip: “Cross-zone for traffic, multi-AZ for compute” to remember that both the ALB and the Auto Scaling group must be AZ-aware.
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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 is designing a highly available architecture for a web application. The application uses an Application Load Balancer (ALB) and an Auto Scaling group of EC2 instances. Which TWO steps should the company take to ensure the architecture is resilient to an Availability Zone failure? (Select TWO.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Auto Scaling group to launch instances in at least two Availability Zones.
Options A and C are correct. Option A ensures the ALB can route traffic to targets in other AZs. Option C ensures EC2 instances are distributed across AZs. Option B is wrong because a single instance type does not improve availability. Option D is wrong because increasing min size in one AZ does not protect against AZ failure. Option E is wrong because CloudWatch alarms do not provide AZ redundancy.
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.
✗
Set the Auto Scaling group's desired capacity to a high number.
Why it's wrong here
High capacity in one AZ does not protect against AZ failure.
✗
Create a CloudWatch alarm that triggers if the ALB has elevated 5xx errors.
Why it's wrong here
Alarms detect issues but do not prevent AZ failure impact.
✓
Configure the Auto Scaling group to launch instances in at least two Availability Zones.
Why this is correct
Distributing instances across AZs ensures availability if one AZ fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a single EC2 instance type for all instances.
Why it's wrong here
Instance type does not affect AZ resilience.
✓
Configure the ALB to be internet-facing and enable cross-zone load balancing.
Why this is correct
Cross-zone load balancing allows the ALB to distribute traffic across instances in multiple AZs.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
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.
Detailed technical explanation
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.
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 SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
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: Configure the Auto Scaling group to launch instances in at least two Availability Zones. — Options A and C are correct. Option A ensures the ALB can route traffic to targets in other AZs. Option C ensures EC2 instances are distributed across AZs. Option B is wrong because a single instance type does not improve availability. Option D is wrong because increasing min size in one AZ does not protect against AZ failure. Option E is wrong because CloudWatch alarms do not provide AZ redundancy.
What should I do if I get this SOA-C02 question wrong?
Identify which SOA-C02 exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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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.
Question Discussion
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