Domain 2: Design Resilient Architectures

Weight: 26% of Scored Content

This domain covers designing scalable, loosely coupled, highly available, and fault-tolerant architectures on AWS.

Task Statements

TaskDescription
Task 2.1Design scalable and loosely coupled architectures
Task 2.2Design highly available and/or fault-tolerant architectures

Key AWS Services

  • Amazon API Gateway, SQS, SNS, EventBridge
  • Elastic Load Balancing (ALB, NLB)
  • Amazon EC2 Auto Scaling
  • AWS Lambda, Fargate, ECS, EKS
  • Amazon Route 53
  • Amazon RDS (Multi-AZ, Read Replicas), RDS Proxy
  • Amazon S3, EBS, EFS
  • AWS Step Functions
  • AWS X-Ray

Key Concepts

  • Horizontal vs vertical scaling
  • Loose coupling via queues and events
  • Disaster recovery strategies (Backup/Restore, Pilot Light, Warm Standby, Active-Active)
  • RPO and RTO
  • Multi-AZ and multi-Region architectures
  • Immutable infrastructure