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 has an AWS Lambda function that processes S3 events. The function is critical and must be available even if one Availability Zone fails. How can a SysOps administrator ensure high availability for the Lambda function?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
No action is required; Lambda functions are inherently highly available within a region.
Option D is correct because AWS Lambda automatically runs across multiple Availability Zones in a region; no additional configuration is needed. Option A is wrong because Lambda is inherently multi-AZ. Option B is wrong because Lambda functions are not tied to AZs. Option C is wrong because the Lambda service itself handles availability.
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 an Application Load Balancer to distribute events to multiple Lambda functions.
Why it's wrong here
Not necessary; Lambda is highly available by design.
✓
No action is required; Lambda functions are inherently highly available within a region.
Configure the Lambda function to run in two subnets in different Availability Zones.
Why it's wrong here
Lambda functions are not associated with subnets unless using VPC, but even then multi-AZ is automatic.
✗
Deploy the Lambda function in two separate regions and use Route 53 failover.
Why it's wrong here
Overkill; single region is sufficient.
Common exam traps
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: No action is required; Lambda functions are inherently highly available within a region. — Option D is correct because AWS Lambda automatically runs across multiple Availability Zones in a region; no additional configuration is needed. Option A is wrong because Lambda is inherently multi-AZ. Option B is wrong because Lambda functions are not tied to AZs. Option C is wrong because the Lambda service itself handles availability.
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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