A solutions architect needs to maintain a fleet of Amazon EC2 instances so that any impaired instances are replaced with new ones. Which AWS service should the solutions architect use?

Question

Options

• AAmazon Elastic Container Service (Amazon ECS)
• BAmazon GuardDuty
• CAWS Shield
• DAWS Auto Scaling

• A
  5% (2)
• B
  3% (1)
• C
  8% (3)
• D
  85% (34)

Explanation

AWS Auto Scaling (D) is the correct choice because it continuously monitors EC2 instances for health and automatically replaces any impaired or unhealthy instances with new ones, ensuring the fleet maintains the desired capacity and availability without manual intervention.

Why the distractors are wrong:

• A (Amazon ECS) is a container orchestration service used to run and manage Docker containers - it doesn't manage raw EC2 instance fleets for health replacement purposes.
• B (Amazon GuardDuty) is a threat detection and security monitoring service that identifies malicious activity; it has no capability to replace EC2 instances.
• C (AWS Shield) is a DDoS protection service designed to defend applications against distributed denial-of-service attacks, not to manage EC2 fleet health.

Memory Tip: Think of AWS Auto Scaling as a "self-healing fleet manager" - whenever an instance fails a health check, Auto Scaling automatically terminates and replaces it. The word "scaling" is a hint that it actively manages instance counts, including maintaining minimums by replacing failed instances.

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