- A
The SQS queue is configured to use a single AZ for message storage.
Why wrong: Incorrect: SQS automatically stores messages in multiple AZs.
- B
SQS messages in the failed AZ are temporarily unavailable until they are replicated to other AZs.
Correct: SQS stores messages redundantly across AZs, but if an AZ fails, messages in that AZ may be temporarily unavailable until replication completes, causing a brief latency spike.
- C
The application is not configured to process messages from multiple AZs.
Why wrong: Incorrect: The application processes messages from the queue, which is agnostic to AZs.
- D
The Auto Scaling group's minimum size is too low to handle the load after the AZ failure.
Why wrong: Incorrect: The question states the Auto Scaling group spans three AZs; latency increase is due to message unavailability, not compute capacity.
Quick Answer
The correct answer is that SQS messages in the failed Availability Zone are temporarily unavailable until they are replicated to other AZs. This latency occurs because Amazon SQS is a regional service that distributes messages across multiple Availability Zones for durability, but when one AZ fails, any messages stored in that specific zone become inaccessible until the service automatically replicates them to the remaining healthy zones. This tests your understanding that SQS provides eventual consistency across AZs, not instant failover—a key distinction for the AWS Certified SysOps Administrator Associate SOA-C02 exam. A common trap is assuming the Auto Scaling group’s multi-AZ configuration alone prevents latency, but the bottleneck is the replication delay for messages already in the failed zone. Remember: SQS messages are like books on three shelves—if one shelf collapses, you must wait for the librarian to copy those books to the other shelves before you can read them.
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 runs on EC2 instances in an Auto Scaling group. The instances process messages from an SQS queue. To ensure high availability, the SysOps administrator has configured the Auto Scaling group to span three Availability Zones. However, during a recent failure of one AZ, the application experienced a temporary increase in processing latency. What is the MOST likely cause of this latency?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue:
"most likely"Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SQS messages in the failed AZ are temporarily unavailable until they are replicated to other AZs.
Option D is correct because the SQS queue is a regional service, but the messages are distributed across AZs. When one AZ fails, messages in that AZ may become temporarily unavailable until they are replicated, causing a delay in processing. Option A is wrong because the Auto Scaling group is already configured to span three AZs. Option B is wrong because SQS automatically replicates across AZs. Option C is wrong because the application should be able to process messages from remaining AZs.
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.
- ✗
The SQS queue is configured to use a single AZ for message storage.
Why it's wrong here
Incorrect: SQS automatically stores messages in multiple AZs.
- ✓
SQS messages in the failed AZ are temporarily unavailable until they are replicated to other AZs.
Why this is correct
Correct: SQS stores messages redundantly across AZs, but if an AZ fails, messages in that AZ may be temporarily unavailable until replication completes, causing a brief latency spike.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
- ✗
The application is not configured to process messages from multiple AZs.
Why it's wrong here
Incorrect: The application processes messages from the queue, which is agnostic to AZs.
- ✗
The Auto Scaling group's minimum size is too low to handle the load after the AZ failure.
Why it's wrong here
Incorrect: The question states the Auto Scaling group spans three AZs; latency increase is due to message unavailability, not compute capacity.
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 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.
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 — study guide chapter
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Reliability and Business Continuity practice questions
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FAQ
Questions learners often ask
What does this SOA-C02 question test?
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: SQS messages in the failed AZ are temporarily unavailable until they are replicated to other AZs. — Option D is correct because the SQS queue is a regional service, but the messages are distributed across AZs. When one AZ fails, messages in that AZ may become temporarily unavailable until they are replicated, causing a delay in processing. Option A is wrong because the Auto Scaling group is already configured to span three AZs. Option B is wrong because SQS automatically replicates across AZs. Option C is wrong because the application should be able to process messages from remaining AZs.
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: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
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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Last reviewed: Jun 20, 2026
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.
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