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Reliability and Business Continuity →mediumMultiple ChoiceObjective-mapped

Quick Answer

The correct answer is to create an AMI from the instance, store data on an Amazon EFS file system, and use an Auto Scaling group with a lifecycle hook to associate the Elastic IP. This solution works because it decouples the stateful data from the compute layer—EFS provides a persistent, shared file system that survives instance termination, while the AMI captures the OS and application configuration for rapid relaunch. The Auto Scaling group automates instance replacement, and the lifecycle hook ensures the new instance automatically re-associates the Elastic IP, enabling seamless failover with minimal manual intervention. On the AWS Certified SysOps Administrator Associate SOA-C02 exam, this scenario tests your understanding of stateless architecture patterns and the distinction between instance store, EBS, and EFS for data persistence. A common trap is choosing an EBS-backed solution with a static Elastic IP, which fails because EBS volumes are tied to a specific Availability Zone and cannot be reattached automatically. Memory tip: think “EFS for state, AMI for shape, ASG for fate”—the file system holds the data, the image holds the configuration, and scaling handles recovery.

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. A key principle to apply: aMIs capture instance configuration for consistent launches.. 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 stateful web application on a single Amazon EC2 instance with an Elastic IP address. The SysOps administrator needs to increase availability so that if the instance fails, a new instance can be launched quickly with the same configuration and the same IP address. The administrator also needs to ensure data is not lost. Which solution meets these requirements with the least operational overhead?

Clue words in this question

Noticing these words before you look at the options changes how you read each choice.

  • Clue: "least"

    Why it matters: You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

Question 1mediummultiple choice
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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

✓

Create an AMI from the instance, store data on an Amazon EFS file system, and use an Auto Scaling group with a lifecycle hook to associate the Elastic IP

Option B is correct because it separates the stateful data (stored on Amazon EFS) from the compute instance, ensuring data persistence even if the instance fails. Creating an AMI from the instance captures the configuration, and an Auto Scaling group with a lifecycle hook can associate the Elastic IP to the new instance automatically, providing a quick failover with minimal operational overhead.

Key principle: AMIs capture instance configuration for consistent launches.

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 an Application Load Balancer with an Auto Scaling group and a launch configuration that includes the Elastic IP

    Why it's wrong here

    Elastic IPs cannot be associated with an auto-scaled instance via a launch configuration. Additionally, an ALB expects dynamic IPs; using an EIP for the instances behind the ALB is not standard and adds complexity.

  • ✓

    Create an AMI from the instance, store data on an Amazon EFS file system, and use an Auto Scaling group with a lifecycle hook to associate the Elastic IP

    Why this is correct

    The AMI provides a pre-configured launch template. EFS provides durable, shared storage for application data. The Auto Scaling group automatically launches a new instance if the current one fails, and the lifecycle hook script associates the Elastic IP to the new instance, ensuring continuity with the same IP.

    Clue confirmation

    The clue word "least" in the question point toward this answer.

    Related concept

    AMIs capture instance configuration for consistent launches.

  • ✗

    Create a CloudFormation template that launches a new instance and associates the Elastic IP

    Why it's wrong here

    While CloudFormation can launch a new instance and associate the EIP, it does not provide automatic failure detection and recovery. Manual or scheduled intervention would be required to detect failure and launch the replacement.

  • ✗

    Place the instance in an Auto Scaling group with a minimum of 1 and a maximum of 1, and set the health check to replace unhealthy instances

    Why it's wrong here

    This would replace the instance if it fails, but it does not address data persistence. The new instance would be launched from the original AMI, losing any data that was not on persistent storage. It also does not automatically reassociate the Elastic IP.

Common exam traps

Common exam trap: answer the scenario, not the keyword

The trap here is that candidates often assume an Auto Scaling group alone can handle Elastic IP association, but without a lifecycle hook or custom script, the new instance will not automatically receive the Elastic IP, leading to IP address changes and potential downtime.

Detailed technical explanation

How to think about this question

Under the hood, an Auto Scaling group lifecycle hook can trigger a custom action (e.g., via AWS Lambda or a script) during instance launch to associate a pre-allocated Elastic IP address using the AWS CLI or SDK. Amazon EFS provides a shared, scalable file system that can be mounted by multiple EC2 instances, ensuring that stateful data (e.g., session data, uploads) is not tied to a single instance's ephemeral storage. This architecture is commonly used for stateful web applications that require a static IP for client whitelisting or legacy integrations.

KKey Concepts to Remember

  • AMIs capture instance configuration for consistent launches.
  • Amazon EFS provides shared, durable, and highly available file storage.
  • Auto Scaling groups automatically replace unhealthy instances.
  • Lifecycle hooks enable custom actions during ASG instance transitions, like EIP reassociation.

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

AMIs capture instance configuration for consistent launches.

Real-world example

How this comes up in practice

A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.

What to study next

Got this wrong? Here's your next step.

Review aMIs capture instance configuration for consistent launches., then practise related SOA-C02 questions on the same topic to reinforce the concept.

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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 — AMIs capture instance configuration for consistent launches..

What is the correct answer to this question?

The correct answer is: Create an AMI from the instance, store data on an Amazon EFS file system, and use an Auto Scaling group with a lifecycle hook to associate the Elastic IP — Option B is correct because it separates the stateful data (stored on Amazon EFS) from the compute instance, ensuring data persistence even if the instance fails. Creating an AMI from the instance captures the configuration, and an Auto Scaling group with a lifecycle hook can associate the Elastic IP to the new instance automatically, providing a quick failover with minimal operational overhead.

What should I do if I get this SOA-C02 question wrong?

Review aMIs capture instance configuration for consistent launches., then practise related SOA-C02 questions on the same topic to reinforce the concept.

Are there clue words in this question I should notice?

Yes — watch for: "least". You want the option with minimum overhead, fewest steps, or lowest impact — not the most feature-rich or comprehensive answer.

What is the key concept behind this question?

AMIs capture instance configuration for consistent launches.

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Last reviewed: Jun 11, 2026

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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.