SOA-C02 · Question #590
A company hosts a critical legacy application on two Amazon EC2 instances that are in one Availability Zone. The instances run behind an Application Load Balancer (ALB). The company uses Amazon…
The correct answer is B. Increase the size of each instance. Create an Amazon EventBridge rule. Configure the. Note: The answer choices are truncated in your question, which makes a precise explanation difficult. Based on what's visible and common AWS exam patterns, here's my best explanation: Option B is likely correct because it combines automated remediation (via Amazon EventBridge…
Question
A company hosts a critical legacy application on two Amazon EC2 instances that are in one Availability Zone. The instances run behind an Application Load Balancer (ALB). The company uses Amazon CloudWatch alarms to send Amazon Simple Notification Service (Amazon SNS) notifications when the ALB health checks detect an unhealthy instance. After a notification, the company's engineers manually restart the unhealthy instance. A SysOps administrator must configure the application to be highly available and more resilient to failures. Which solution will meet these requirements?
Options
- ACreate an Amazon Machine Image (AMI) from a healthy instance. Launch additional instances
- BIncrease the size of each instance. Create an Amazon EventBridge rule. Configure the
- CCreate an Amazon Machine Image (AMI) from a healthy instance. Launch an additional instance
- DCreate an Amazon Machine Image (AMI) from a healthy instance. Create a launch template that
How the community answered
(26 responses)- A4% (1)
- B81% (21)
- C12% (3)
- D4% (1)
Explanation
Note: The answer choices are truncated in your question, which makes a precise explanation difficult. Based on what's visible and common AWS exam patterns, here's my best explanation:
Option B is likely correct because it combines automated remediation (via Amazon EventBridge triggering an automated action - such as an SSM automation or Lambda - to replace/restart unhealthy instances) with infrastructure changes that improve availability, removing the manual engineer intervention that creates downtime risk. EventBridge integrating with CloudWatch alarms enables event-driven, hands-off recovery, which directly addresses the "more resilient to failures" requirement.
Options A and C both involve creating AMIs and launching additional instances, but based on their truncated text, they likely deploy those instances within the same single Availability Zone - this replicates capacity but does not eliminate the single point of failure, leaving the application vulnerable to an AZ-level outage.
Option D creates a launch template, which is a good building block, but the truncated text suggests it may be missing the automated remediation component (EventBridge + action) that removes the dependency on manual restarts.
Memory tip: For AWS HA questions, think "2 things must be true" - span multiple AZs (fault isolation) AND automate recovery (no manual steps). If an answer only does one of those, it's incomplete. EventBridge + automated action = the "automation" half of that checklist.
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