The correct answer is to increase the desired task count to ensure sufficient capacity across Availability Zones. This works because Amazon ECS Fargate distributes tasks evenly across the specified AZs, and by raising the task count, you guarantee that enough healthy tasks remain in the surviving zones to absorb the full workload when an entire AZ fails. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of high-availability design for serverless containers, specifically that Fargate tasks are AZ-aware but do not automatically rebalance load—you must provision extra capacity to tolerate zone loss. A common trap is confusing subnets or placement groups with reliability; remember that Fargate ignores placement groups and simply adding more subnets does not increase task count. For a memory tip, think “more tasks, more tolerance”—just as a herd needs extra members to survive losing a pasture, your Fargate service needs extra tasks to survive losing an AZ.
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.
An application running on Amazon ECS with Fargate launch type is experiencing intermittent failures. The tasks are spread across multiple Availability Zones. The SysOps administrator notices that failures occur only when an entire AZ becomes unavailable. What should the administrator do to improve the reliability of the application?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Increase the desired task count to ensure sufficient capacity across AZs.
Option A is correct because increasing the number of tasks ensures that even if one AZ fails, tasks in other AZs can handle the load. Option B is incorrect because using more subnets does not necessarily improve availability. Option C is incorrect because placement groups are not applicable to Fargate. Option D is incorrect because EFS is for shared storage, not compute reliability.
Key principle: Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
Use multiple subnets in the same AZ.
Why it's wrong here
Multiple subnets in the same AZ do not protect against AZ failure.
✗
Use a cluster placement group.
Why it's wrong here
Placement groups are for EC2 instances, not Fargate tasks.
✗
Attach an Amazon EFS filesystem to all tasks.
Why it's wrong here
EFS provides shared storage, not compute redundancy.
✓
Increase the desired task count to ensure sufficient capacity across AZs.
Why this is correct
More tasks distributed across AZs provide redundancy.
Common exam trap: usable hosts are not the same as total addresses
Subnetting questions often tempt you into counting all addresses. In normal IPv4 subnets, the network and broadcast addresses are not usable host addresses.
Detailed technical explanation
How to think about this question
Subnetting questions test whether you can identify the network, broadcast address, usable range, mask and correct subnet. Slow down enough to calculate the block size correctly.
KKey Concepts to Remember
CIDR notation defines the prefix length.
Block size helps identify subnet boundaries.
Network and broadcast addresses are not usable hosts in normal IPv4 subnets.
The required host count determines the smallest suitable subnet.
TExam Day Tips
→Write the block size before choosing the subnet.
→Check whether the question asks for hosts, subnets or a specific address range.
→Do not confuse /24, /25, /26 and /27 host counts.
Key takeaway
Count usable hosts — not total addresses — and remember that the network and broadcast addresses are not available to hosts in standard IPv4 subnets.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
Reliability and Business Continuity — This question tests Reliability and Business Continuity — CIDR notation defines the prefix length..
What is the correct answer to this question?
The correct answer is: Increase the desired task count to ensure sufficient capacity across AZs. — Option A is correct because increasing the number of tasks ensures that even if one AZ fails, tasks in other AZs can handle the load. Option B is incorrect because using more subnets does not necessarily improve availability. Option C is incorrect because placement groups are not applicable to Fargate. Option D is incorrect because EFS is for shared storage, not compute reliability.
What should I do if I get this SOA-C02 question wrong?
Review block sizes, usable host formulas (2^n − 2), and how to find network and broadcast addresses for /24 through /30. Then practise related SOA-C02 subnetting questions on CIDR, address ranges, and subnet selection.
What is the key concept behind this question?
CIDR notation defines the prefix length.
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Question Discussion
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