AWS Certified SysOps Administrator – Associate (legacy) — Question 569

A company's web application runs on Amazon EC2 instances behind an ELB Application Load Balancer. The EC2 instances run in an EC2 Auto Scaling group across multiple Availability Zones. Data is stored in an Amazon ElastiCache for Redis cluster and an Amazon RDS DB instance. Company policy requires all system patching to take place at midnight on Tuesday.
Which resources will need to have a maintenance window configured for midnight on Tuesday? (Choose two.)

Answer options

• A. Elastic Load Balancer
• B. EC2 instances
• C. RDS instance
• D. ElastiCache cluster
• E. Auto Scaling group

Correct answer: C, D

Explanation

Amazon RDS and Amazon ElastiCache are AWS-managed services that require user-defined maintenance windows to perform crucial system updates, database engine patching, and software modifications. On the other hand, Elastic Load Balancers and Auto Scaling groups do not utilize traditional maintenance windows, and EC2 instance OS-level patching is managed directly by the customer using tools like AWS Systems Manager Patch Manager.