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 Amazon ECS with the Fargate launch type. The application must remain available if a single Availability Zone fails. The SysOps administrator needs to configure the ECS service for high availability. Which configuration should be used?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use a spread placement strategy across multiple Availability Zones.
Option B is correct because using a spread placement strategy across multiple Availability Zones ensures that ECS tasks are distributed across distinct zones, so the application remains available if a single zone fails. With Fargate, the spread strategy can be applied at the Availability Zone level, and ECS automatically manages task placement to maintain the desired distribution. This configuration meets the high availability requirement by eliminating a single point of failure at the zone level.
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.
✗
Place tasks in a single Availability Zone.
Why it's wrong here
This creates a single point of failure; if that AZ goes down, the entire application becomes unavailable.
✓
Use a spread placement strategy across multiple Availability Zones.
Why this is correct
Spreading tasks across multiple AZs ensures continuity if one AZ fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a binpack placement strategy.
Why it's wrong here
Binpack maximizes resource usage but does not guarantee distribution across AZs; it may place tasks in a single AZ.
✗
Increase the desired task count to 10.
Why it's wrong here
A higher task count does not ensure they are spread across AZs; all tasks could still be in the same AZ.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse increasing task count with achieving high availability, failing to realize that without a placement strategy that spans multiple Availability Zones, all tasks could still reside in a single zone and be lost during a zone failure.
Detailed technical explanation
How to think about this question
Under the hood, ECS with Fargate uses the placement strategy 'spread' with the field 'attribute:ecs.availability-zone' to distribute tasks evenly across zones; ECS maintains this distribution during deployments and scaling events. A subtle behavior is that if a zone becomes unhealthy, ECS will automatically replace tasks in that zone with tasks in healthy zones, but only if the service is configured with a spread strategy and the desired count is maintained. In a real-world scenario, combining a spread strategy with a multi-AZ Application Load Balancer target group ensures traffic is routed only to healthy tasks, providing end-to-end high availability.
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 — 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: Use a spread placement strategy across multiple Availability Zones. — Option B is correct because using a spread placement strategy across multiple Availability Zones ensures that ECS tasks are distributed across distinct zones, so the application remains available if a single zone fails. With Fargate, the spread strategy can be applied at the Availability Zone level, and ECS automatically manages task placement to maintain the desired distribution. This configuration meets the high availability requirement by eliminating a single point of failure at the zone level.
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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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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