About This Domain
Domain 2 — Design Resilient Architectures — accounts for 26% of the SAA-C03 certification exam. This domain evaluates your understanding of multi-tier architecture design with loose coupling, high availability and fault tolerance patterns, disaster recovery strategies (backup/restore, pilot light, warm standby, active-active), and related concepts. Domain 2 focuses on designing multi-tier architectures, highly available and fault-tolerant systems, and implementing appropriate decoupling mechanisms. To pass this section you need practical knowledge of how these services and patterns work together in real-world architectures.
What You'll Be Tested On
- Multi-tier architecture design with loose coupling
- High availability and fault tolerance patterns
- Disaster recovery strategies (backup/restore, pilot light, warm standby, active-active)
- Decoupling with SQS, SNS, and EventBridge
- Database high availability (RDS Multi-AZ, Aurora Global)
- Infrastructure as code with CloudFormation
Key AWS Services in This Domain
Study Strategy for Domain 2
This domain represents 26% of the total exam, making it a significant scoring area. Balance theoretical study with hands-on practice. Use practice quizzes to identify weak spots and review the topics where you score below 75%.
Exam Tips for Domain 2
Know the RPO/RTO tradeoffs for each DR strategy.
Multi-AZ provides high availability; multi-region provides disaster recovery.
Use SQS to decouple components and handle traffic spikes gracefully.
Aurora Global Database enables cross-region disaster recovery with <1s replication lag.
Frequently Asked Questions
How many questions on the SAA-C03 exam come from Domain 2?
Domain 2 (Design Resilient Architectures) makes up 26% of the SAA-C03 exam. The exam has 65 scored questions, so approximately 17 questions will come from this domain.
What services should I focus on for Domain 2?
The key services for this domain include ELB, Auto Scaling, RDS, SQS, SNS, Route 53, CloudFormation, S3, EFS. Make sure you understand how each service works, its use cases, and how they integrate with one another.
How should I prepare for Design Resilient Architectures questions?
Start by reviewing the key topics listed above, then practice with domain-specific questions. Focus on understanding real-world scenarios rather than memorizing facts. Use our practice quizzes to test your knowledge and review explanations for any questions you get wrong.
What's the best order to study the SAA-C03 domains?
Many candidates start with the highest-weighted domains first. For the SAA-C03 exam, the domains in order of weight are: Design Secure Architectures (30%), Design Resilient Architectures (26%), Design High-Performing Architectures (24%), Design Cost-Optimized Architectures (20%). However, start with whichever domain aligns best with your existing experience.
Practice Domain 2 Questions
Test your knowledge of Design Resilient Architectures with practice questions from our SAA-C03 question bank.
Start Practice Quiz →