The correct answer is to ensure the load balancer has cross-zone load balancing enabled and the Auto Scaling group has a sufficient maximum size to handle the load of a failed AZ. This works because cross-zone load balancing allows the load balancer to distribute incoming traffic evenly across all healthy instances in every Availability Zone, rather than routing traffic only to instances in the same AZ as the requesting client. Without it, if an AZ fails, the remaining instances in other AZs would be overwhelmed by traffic intended for the failed zone. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of how Auto Scaling and Elastic Load Balancing interact to achieve high availability—a common trap is assuming that simply spanning multiple AZs is enough, but you must also configure cross-zone balancing and a maximum size large enough to absorb the full load when one AZ is lost. Remember the mnemonic: “Cross-zone spreads the load, max size holds the load.”
SOA-C02 Reliability and Business Continuity Practice Question
This SOA-C02 practice question tests your understanding of reliability and business continuity. 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 company runs a stateless web application on EC2 instances in an Auto Scaling group. The application is deployed in us-east-1 with three Availability Zones. The SysOps administrator wants to ensure that the application remains available even if an entire Availability Zone becomes unavailable. The Auto Scaling group is configured with a minimum of 3, maximum of 9, and desired capacity of 3. The instances are distributed evenly across the three AZs. What additional configuration is required to ensure the application can survive an AZ failure?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "minimum / minimize"
Why it matters: Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
Increase the desired capacity to 6 to ensure enough capacity if one AZ fails.
Why wrong: Without cross-zone distribution, increasing capacity may not help.
B
Ensure the load balancer is cross-zone load balancing enabled and the Auto Scaling group has a sufficient maximum size to handle the load of a failed AZ.
Cross-zone balancing distributes traffic across healthy instances in all AZs.
C
Configure the Auto Scaling group to launch instances in only two AZs to reduce costs.
Why wrong: Reduces availability.
D
Place the Auto Scaling group in a single AZ to simplify management.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Ensure the load balancer is cross-zone load balancing enabled and the Auto Scaling group has a sufficient maximum size to handle the load of a failed AZ.
Option C is correct. The Auto Scaling group already spans multiple AZs, but to survive an AZ failure, the group should be configured with a sufficient buffer and the load balancer should be cross-zone enabled. However, the simplest answer is to ensure that the Auto Scaling group has a balanced distribution and the load balancer is configured to distribute traffic across all AZs. Option A is wrong because increasing the desired capacity does not necessarily protect against AZ failure if all instances are in one AZ. Option B is wrong because the group already spans multiple AZs. Option D is wrong because distributing instances evenly is already done.
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.
✗
Increase the desired capacity to 6 to ensure enough capacity if one AZ fails.
Why it's wrong here
Without cross-zone distribution, increasing capacity may not help.
✓
Ensure the load balancer is cross-zone load balancing enabled and the Auto Scaling group has a sufficient maximum size to handle the load of a failed AZ.
Why this is correct
Cross-zone balancing distributes traffic across healthy instances in all AZs.
Clue confirmation
The clue word "minimum / minimize" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
✗
Configure the Auto Scaling group to launch instances in only two AZs to reduce costs.
Why it's wrong here
Reduces availability.
✗
Place the Auto Scaling group in a single AZ to simplify management.
Why it's wrong here
Increases risk of failure.
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
A startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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: Ensure the load balancer is cross-zone load balancing enabled and the Auto Scaling group has a sufficient maximum size to handle the load of a failed AZ. — Option C is correct. The Auto Scaling group already spans multiple AZs, but to survive an AZ failure, the group should be configured with a sufficient buffer and the load balancer should be cross-zone enabled. However, the simplest answer is to ensure that the Auto Scaling group has a balanced distribution and the load balancer is configured to distribute traffic across all AZs. Option A is wrong because increasing the desired capacity does not necessarily protect against AZ failure if all instances are in one AZ. Option B is wrong because the group already spans multiple AZs. Option D is wrong because distributing instances evenly is already done.
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.
Are there clue words in this question I should notice?
Yes — watch for: "minimum / minimize". Asks for the least resource use — fewest addresses, smallest subnet, lowest overhead. Eliminate over-provisioned options even if they would technically work.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
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These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.
Variation 1. A company runs a stateless web application on EC2 instances in an Auto Scaling group. The application is deployed across multiple Availability Zones. The SysOps administrator wants to ensure that the application remains available even if an entire Availability Zone fails. What is the MOST effective way to achieve this?
easy
✓ A.Configure the Auto Scaling group to launch instances in at least two Availability Zones.
B.Create a CloudWatch alarm to reboot instances when they become unhealthy.
C.Use a single Availability Zone to reduce complexity.
D.Use a larger instance type to handle more traffic.
Why A: Configuring the Auto Scaling group to use multiple Availability Zones ensures that instances are distributed, so failure of one AZ does not affect all instances. Option A is wrong because it does not provide redundancy. Option B is wrong because it does not automatically recover. Option D is wrong because a single AZ does not protect against AZ failure.
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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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