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DOP-C02 Domain 6: Reliability and Resilience

A stateless web tier on EC2 behind an ALB uses Amazon RDS for MySQL Multi-AZ. DR in a second Region must achieve RTO under 2 hours and RPO under 10 minutes, cost-effectively. Which DR design fits?

Multiple choice — select one answer

Answer choices

  1. a. Multi-AZ worker nodes and pod topology spread
  2. b. Maintain current AMIs for the web tier in the DR Region; cross-Region RDS read replica; on disaster launch a CloudFormation stack, promote the replica, update DNS to the new load balancer.
  3. c. Multi-Region active-passive or active-active
  4. d. AWS Fault Injection Simulator experiment templates

Architectural breakdown & explanation

Cross-Region read replicas meet tight RPO; AMIs plus IaC in DR meet RTO without full active-active cost.

Correct answer(s): b. Maintain current AMIs for the web tier in the DR Region; cross-Region RDS read replica; on disaster launch a CloudFormation stack, promote the replica, update DNS to the new load balancer.

Exam domain: Domain 6: Reliability and Resilience (14% weight on the official guide).

Official documentation & study links

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