- A
Configure the Auto Scaling group to launch instances in a single AZ with a larger instance type.
Why wrong: Single AZ is not resilient to AZ failure.
- B
Deploy a single large EC2 instance in one AZ and use an Elastic IP for failover.
Why wrong: Single instance is a single point of failure.
- C
Use a Network Load Balancer instead of an ALB and deploy instances in two AZs.
Why wrong: Two AZs provide less resilience than three, and NLB does not add resilience by itself.
- D
Configure the Auto Scaling group to span at least three AZs and set the ALB to route traffic to all AZs.
Multi-AZ deployment ensures resilience.
Question 1,111 of 1,750
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.
A company runs a critical e-commerce application on Amazon EC2 instances behind an Application Load Balancer (ALB) with Auto Scaling. The application must be resilient to an Availability Zone (AZ) failure. What is the MOST resilient configuration?
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
✓
Configure the Auto Scaling group to span at least three AZs and set the ALB to route traffic to all AZs.
Option D is correct because spanning the Auto Scaling group across at least three Availability Zones (AZs) and routing traffic from the ALB to all AZs ensures that if one AZ fails, the remaining AZs can handle the load without interruption. This configuration leverages the ALB's native cross-zone load balancing and Auto Scaling's ability to maintain desired capacity across multiple AZs, providing fault isolation and high availability for the critical e-commerce application.
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.
- ✗
Configure the Auto Scaling group to launch instances in a single AZ with a larger instance type.
Why it's wrong here
Single AZ is not resilient to AZ failure.
- ✗
Deploy a single large EC2 instance in one AZ and use an Elastic IP for failover.
Why it's wrong here
Single instance is a single point of failure.
- ✗
Use a Network Load Balancer instead of an ALB and deploy instances in two AZs.
Why it's wrong here
Two AZs provide less resilience than three, and NLB does not add resilience by itself.
- ✓
Configure the Auto Scaling group to span at least three AZs and set the ALB to route traffic to all AZs.
Why this is correct
Multi-AZ deployment ensures resilience.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse high availability with fault tolerance, mistakenly thinking that a single large instance or a single AZ with a larger instance type provides resilience, when in fact distributing workloads across multiple AZs is the only way to survive an AZ failure without manual intervention.
Detailed technical explanation
How to think about this question
Under the hood, the ALB performs cross-zone load balancing by default, distributing traffic evenly across healthy targets in all enabled AZs, while Auto Scaling groups maintain a balanced number of instances per AZ when configured with multiple AZs. In a real-world scenario, if an AZ experiences a complete outage, the ALB automatically stops routing traffic to that AZ's targets, and the Auto Scaling group launches replacement instances in the remaining AZs to maintain capacity, ensuring the application remains available with minimal latency impact.
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.
TExam Day Tips
- 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 exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
- →
Resilient Cloud Solutions — study guide chapter
Learn the concepts, then practise the questions
- →
Resilient Cloud Solutions practice questions
Targeted practice on this topic area only
- →
All DOP-C02 questions
1,750 questions across all exam domains
- →
AWS Certified DevOps Engineer Professional DOP-C02 study guide
Full concept coverage aligned to exam objectives
- →
DOP-C02 practice test guide
How to use practice tests most effectively before exam day
Related practice questions
Related DOP-C02 practice-question pages
Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.
Configuration Management and IaC practice questions
Practise DOP-C02 questions linked to Configuration Management and IaC.
Resilient Cloud Solutions practice questions
Practise DOP-C02 questions linked to Resilient Cloud Solutions.
Monitoring and Logging practice questions
Practise DOP-C02 questions linked to Monitoring and Logging.
Incident and Event Response practice questions
Practise DOP-C02 questions linked to Incident and Event Response.
Security and Compliance practice questions
Practise DOP-C02 questions linked to Security and Compliance.
SDLC Automation practice questions
Practise DOP-C02 questions linked to SDLC Automation.
DOP-C02 fundamentals practice questions
Practise DOP-C02 questions linked to DOP-C02 fundamentals.
DOP-C02 scenario practice questions
Practise DOP-C02 questions linked to DOP-C02 scenario.
DOP-C02 troubleshooting practice questions
Practise DOP-C02 questions linked to DOP-C02 troubleshooting.
Practice this exam
Start a free DOP-C02 practice session
Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.
FAQ
Questions learners often ask
What does this DOP-C02 question test?
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: Configure the Auto Scaling group to span at least three AZs and set the ALB to route traffic to all AZs. — Option D is correct because spanning the Auto Scaling group across at least three Availability Zones (AZs) and routing traffic from the ALB to all AZs ensures that if one AZ fails, the remaining AZs can handle the load without interruption. This configuration leverages the ALB's native cross-zone load balancing and Auto Scaling's ability to maintain desired capacity across multiple AZs, providing fault isolation and high availability for the critical e-commerce application.
What should I do if I get this DOP-C02 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
About these practice questions
Courseiva creates original exam-style practice questions with explanations and wrong-answer analysis. It does not publish real exam questions, exam dumps, or protected exam content. Learn why practice questions differ from exam dumps →
Keep practising
More DOP-C02 practice questions
- A company uses AWS CodePipeline with a multi-branch strategy. A new feature branch triggers a pipeline that runs unit te…
- A development team uses AWS CodeBuild to compile a Java application and run unit tests. The build takes 30 minutes, but…
- A company uses AWS CodePipeline with multiple stages: Source (Amazon S3), Build (AWS CodeBuild), and Deploy (AWS CodeDep…
- A company uses AWS CodeCommit for source control. Developers frequently push large binary files (e.g., compiled JARs) to…
- A company runs a Stateful application on EC2 that requires sticky sessions. They use an ALB with duration-based stickine…
- An organization uses AWS CodePipeline to orchestrate deployments to multiple environments (dev, test, prod). Each enviro…
Last reviewed: Jul 4, 2026
This DOP-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 DOP-C02 exam.
Question Discussion
Share a tip, memory trick, or ask about the reasoning behind this question. Do not post real exam questions, leaked content, braindumps, or copyrighted exam material. Comments are moderated and may be removed without notice.
Sign in to join the discussion.