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 runs a stateful web application on a single EC2 instance. The SysOps Administrator wants to improve fault tolerance. Which design should they implement?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Place instances in an Auto Scaling group across two Availability Zones, use an Application Load Balancer, and store session state in ElastiCache.
Option A is correct because a Multi-AZ deployment with an ALB and Auto Scaling group distributes traffic across instances in multiple AZs, and using ElastiCache for session state provides fault tolerance. Option B is wrong because it still has a single point of failure. Option C is wrong because it lacks load balancing and auto scaling. Option D is wrong because it uses instance store for session state, which is ephemeral.
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 a Multi-AZ RDS instance and attach it to the existing EC2 instance.
Why it's wrong here
Does not address EC2 fault tolerance.
✗
Add a second EC2 instance in the same Availability Zone and use a Network Load Balancer.
Why it's wrong here
Single AZ is a single point of failure.
✗
Use an Auto Scaling group with a launch configuration that stores session data on instance store.
Why it's wrong here
Instance store is ephemeral and lost on instance termination.
✓
Place instances in an Auto Scaling group across two Availability Zones, use an Application Load Balancer, and store session state in ElastiCache.
Why this is correct
Provides high availability and fault tolerance.
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: Place instances in an Auto Scaling group across two Availability Zones, use an Application Load Balancer, and store session state in ElastiCache. — Option A is correct because a Multi-AZ deployment with an ALB and Auto Scaling group distributes traffic across instances in multiple AZs, and using ElastiCache for session state provides fault tolerance. Option B is wrong because it still has a single point of failure. Option C is wrong because it lacks load balancing and auto scaling. Option D is wrong because it uses instance store for session state, which is ephemeral.
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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Question Discussion
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