The answer is to deploy EC2 instances in at least two Availability Zones. This design ensures that if an entire AZ fails, your application remains available because the instances in the other AZs continue to run, and an Auto Scaling group configured across multiple AZs will automatically distribute new instances and replace any that are lost. On the AWS Certified DevOps Engineer Professional DOP-C02 exam, this concept tests your understanding of high-availability architecture and fault isolation, often appearing in questions that try to trap you with single-AZ solutions or irrelevant details like instance types or CloudWatch alarms. A common mistake is thinking that monitoring alone can survive an AZ failure, but resilience requires physical redundancy, not just alerting. Remember the mnemonic: "Two AZs keep the app at ease."
DOP-C02 Resilient Cloud Solutions Practice Question
This DOP-C02 practice question tests your understanding of resilient cloud solutions. 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.
Which TWO actions can help ensure that an application running on EC2 instances can survive the loss of an entire Availability Zone?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Use an Auto Scaling group with multiple Availability Zones
Deploying instances in multiple AZs ensures that if one AZ fails, instances in other AZs continue to run. Using an Auto Scaling group with multiple AZs automatically distributes instances and replaces failed ones. Option B is wrong because a single AZ is vulnerable. Option D is wrong because instance type does not affect AZ resilience. Option E is wrong because CloudWatch alarms do not distribute instances.
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.
✗
Deploy all instances in a single Availability Zone for consistency
Why it's wrong here
Single AZ is a single point of failure.
✓
Use an Auto Scaling group with multiple Availability Zones
Why this is correct
Auto Scaling distributes instances across AZs and replaces failed ones.
Related concept
Read the scenario before looking for a memorised answer.
✓
Deploy EC2 instances in at least two Availability Zones
Why this is correct
Ensures application runs in multiple AZs.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use a larger instance type to handle more load
Why it's wrong here
Instance size does not provide AZ resilience.
✗
Use CloudWatch alarms to monitor instance health
Why it's wrong here
Monitoring alone does not provide AZ resilience.
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 DOP-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.
Resilient Cloud Solutions — This question tests Resilient Cloud Solutions — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Use an Auto Scaling group with multiple Availability Zones — Deploying instances in multiple AZs ensures that if one AZ fails, instances in other AZs continue to run. Using an Auto Scaling group with multiple AZs automatically distributes instances and replaces failed ones. Option B is wrong because a single AZ is vulnerable. Option D is wrong because instance type does not affect AZ resilience. Option E is wrong because CloudWatch alarms do not distribute instances.
What should I do if I get this DOP-C02 question wrong?
Identify which DOP-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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