- A
Use a single Availability Zone to reduce latency.
Why wrong: Single AZ is a single point of failure.
- B
Use Spot Instances to reduce costs.
Why wrong: Spot instances can be interrupted, compromising availability.
- C
Use a Classic Load Balancer to distribute traffic.
Why wrong: CLB does not support cross-zone load balancing without additional configuration.
- D
Place an Application Load Balancer in front of the Auto Scaling group.
ALB distributes traffic across AZs and instances.
- E
Configure the Auto Scaling group to launch instances in multiple Availability Zones.
Multiple AZs provide fault tolerance.
Question 622 of 1,750
DOP-C02 Incident and Event Response Practice Question
This DOP-C02 practice question tests your understanding of incident and event response. 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 EC2 instances in an Auto Scaling group. The application must be highly available across multiple Availability Zones. Which TWO configurations are necessary to achieve this? (Choose TWO.)
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
✓
Place an Application Load Balancer in front of the Auto Scaling group.
To achieve high availability across multiple Availability Zones (AZs), two key configurations are required. First, the Auto Scaling group must be configured to launch instances in multiple AZs (Option E). This ensures that if one AZ fails, the application can continue serving traffic from instances in other AZs. Second, an Application Load Balancer (ALB) should be placed in front of the Auto Scaling group (Option D). The ALB distributes incoming traffic across instances in all AZs where the Auto Scaling group has launched instances. It also performs health checks and automatically routes traffic away from unhealthy instances. Option A is incorrect because using a single AZ would create a single point of failure, undermining high availability. Option B is incorrect because Spot Instances can be terminated with little notice, which is unsuitable for a critical application requiring consistent availability. Option C is incorrect because a Classic Load Balancer lacks advanced features like path-based routing and native cross-zone load balancing, making the ALB a better choice for modern applications.
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.
- ✗
Use a single Availability Zone to reduce latency.
Why it's wrong here
Single AZ is a single point of failure.
- ✗
Use Spot Instances to reduce costs.
Why it's wrong here
Spot instances can be interrupted, compromising availability.
- ✗
Use a Classic Load Balancer to distribute traffic.
Why it's wrong here
CLB does not support cross-zone load balancing without additional configuration.
- ✓
Place an Application Load Balancer in front of the Auto Scaling group.
Why this is correct
ALB distributes traffic across AZs and instances.
Related concept
Read the scenario before looking for a memorised answer.
- ✓
Configure the Auto Scaling group to launch instances in multiple Availability Zones.
Why this is correct
Multiple AZs provide fault tolerance.
Related concept
Read the scenario before looking for a memorised answer.
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 startup's cloud architect reviews their monthly bill and notices costs are higher than expected for a long-running batch job. Switching from on-demand instances to Reserved Instances — or using Spot/Preemptible VMs — can reduce compute costs by up to 72 %. Questions like this test whether you understand the tradeoffs between commitment, flexibility, and cost across cloud pricing models.
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.
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Incident and Event Response — study guide chapter
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FAQ
Questions learners often ask
What does this DOP-C02 question test?
Incident and Event Response — This question tests Incident and Event Response — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Place an Application Load Balancer in front of the Auto Scaling group. — To achieve high availability across multiple Availability Zones (AZs), two key configurations are required. First, the Auto Scaling group must be configured to launch instances in multiple AZs (Option E). This ensures that if one AZ fails, the application can continue serving traffic from instances in other AZs. Second, an Application Load Balancer (ALB) should be placed in front of the Auto Scaling group (Option D). The ALB distributes incoming traffic across instances in all AZs where the Auto Scaling group has launched instances. It also performs health checks and automatically routes traffic away from unhealthy instances. Option A is incorrect because using a single AZ would create a single point of failure, undermining high availability. Option B is incorrect because Spot Instances can be terminated with little notice, which is unsuitable for a critical application requiring consistent availability. Option C is incorrect because a Classic Load Balancer lacks advanced features like path-based routing and native cross-zone load balancing, making the ALB a better choice for modern applications.
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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Last reviewed: Jun 20, 2026
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