← SOA-C02·Amazon Web Services

Question 35 of 1,546

Reliability and Business Continuity →hardMultiple SelectObjective-mapped

Multi-AZ Resilience — Surviving an Availability Zone Failure | AWS SysOps Associate Explained

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 runs a stateless web application on EC2 instances behind an Application Load Balancer. The SysOps Administrator needs to ensure the application can withstand the loss of an entire Availability Zone. Which THREE steps should be taken? (Choose THREE.)

A
Enable cross-zone load balancing on the ALB.
Why wrong: Cross-zone load balancing distributes traffic evenly across all AZs, which is desirable, but not enabling it would limit traffic to one AZ at a time.
B
Configure the Auto Scaling group to launch instances in at least two Availability Zones.
Ensures instances are distributed across AZs.
C
Ensure the ALB is configured to route traffic to all enabled AZs.
ALB can route to instances in any AZ.
D
Configure the Auto Scaling group to use a dynamic scaling policy based on CPU utilization.
Auto Scaling across AZs maintains capacity even if an AZ fails.
E
Use an Elastic IP address for each EC2 instance.
Why wrong: Elastic IPs are not needed with ALB and do not help with AZ failure.

Full breakdown with real-world context →

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 launch instances in at least two Availability Zones.

Option B is correct because configuring the Auto Scaling group to launch instances in at least two Availability Zones (AZs) ensures that if one entire AZ fails, the remaining AZ(s) still have running instances to serve traffic. This is a fundamental pattern for high availability and fault tolerance in AWS, as it distributes the application across physically separate data centers within a region.

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.

✗
Enable cross-zone load balancing on the ALB.
Why it's wrong here
Cross-zone load balancing distributes traffic evenly across all AZs, which is desirable, but not enabling it would limit traffic to one AZ at a time.
✓
Configure the Auto Scaling group to launch instances in at least two Availability Zones.
Why this is correct
Ensures instances are distributed across AZs.
Related concept
Read the scenario before looking for a memorised answer.
✓
Ensure the ALB is configured to route traffic to all enabled AZs.
Why this is correct
ALB can route to instances in any AZ.
Related concept
Read the scenario before looking for a memorised answer.
✓
Configure the Auto Scaling group to use a dynamic scaling policy based on CPU utilization.
Why this is correct
Auto Scaling across AZs maintains capacity even if an AZ fails.
Related concept
Read the scenario before looking for a memorised answer.
✗
Use an Elastic IP address for each EC2 instance.
Why it's wrong here
Elastic IPs are not needed with ALB and do not help with AZ failure.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often confuse cross-zone load balancing (which optimizes traffic distribution within healthy AZs) with multi-AZ deployment (which ensures instance availability across AZs), leading them to incorrectly select Option A as a solution for AZ failure.

Detailed technical explanation

How to think about this question

Under the hood, an ALB operates at the application layer (Layer 7) and uses a DNS-based endpoint to route traffic to healthy targets in all enabled AZs. When an Auto Scaling group spans multiple AZs, it launches instances in each AZ based on the subnets specified, and the ALB health checks automatically stop sending traffic to unhealthy instances. In a real-world scenario, if an AZ fails, the ALB continues to route traffic only to the healthy AZ(s), and the Auto Scaling group can launch replacement instances in the remaining AZ(s) if the scaling policy is configured appropriately.

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.

Related SOA-C02 practice-question pages

Use these pages to review the topic behind this question. This is how one missed question becomes focused revision.

Monitoring, Logging, and Remediation practice questions

Practise SOA-C02 questions linked to Monitoring, Logging, and Remediation.

Reliability and Business Continuity practice questions

Practise SOA-C02 questions linked to Reliability and Business Continuity.

Deployment, Provisioning, and Automation practice questions

Practise SOA-C02 questions linked to Deployment, Provisioning, and Automation.

Security and Compliance practice questions

Practise SOA-C02 questions linked to Security and Compliance.

Networking and Content Delivery practice questions

Practise SOA-C02 questions linked to Networking and Content Delivery.

Cost and Performance Optimization practice questions

Practise SOA-C02 questions linked to Cost and Performance Optimization.

SOA-C02 fundamentals practice questions

Practise SOA-C02 questions linked to SOA-C02 fundamentals.

SOA-C02 scenario practice questions

Practise SOA-C02 questions linked to SOA-C02 scenario.

SOA-C02 troubleshooting practice questions

Practise SOA-C02 questions linked to SOA-C02 troubleshooting.

Practice this exam

Start a free SOA-C02 practice session

Short sessions build daily habit. Longer sessions build exam-day stamina. Try a timed session to simulate real conditions.

10 questions 20 questions 30 questions 50 questions Timed 30

SOA-C02 practice-test guide →Study guide →Browse all practice tests

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: Configure the Auto Scaling group to launch instances in at least two Availability Zones. — Option B is correct because configuring the Auto Scaling group to launch instances in at least two Availability Zones (AZs) ensures that if one entire AZ fails, the remaining AZ(s) still have running instances to serve traffic. This is a fundamental pattern for high availability and fault tolerance in AWS, as it distributes the application across physically separate data centers within a region.

What should I do if I get this SOA-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 →

How Courseiva writes practice questions · Editorial policy

Same concept, more angles

1 more ways this is tested on SOA-C02

These questions test the same concept from different angles. Work through them to make sure you can recognise it however the exam phrases it.

Variation 1. A company is designing a highly available architecture for a web application using AWS services. Which TWO actions should the SysOps administrator take to improve reliability? (Choose TWO.)

medium

A.Use a single large EC2 instance to eliminate complexity.
✓ B.Use an Auto Scaling group with an Elastic Load Balancer.
C.Use a single NAT gateway for outbound traffic.
✓ D.Deploy EC2 instances in multiple Availability Zones.
E.Store application data on a single EBS volume.

Why B: Option B is correct because an Auto Scaling group combined with an Elastic Load Balancer automatically distributes incoming traffic across healthy EC2 instances and replaces any failed instances, ensuring the application remains available even during instance failures or traffic spikes. This architecture is a core AWS best practice for building highly available and resilient web applications.

Keep practising

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.

Loading comments…

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.