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High Availability and Fault Tolerance Flashcards
AWS Certified CloudOps Engineer Associate SOA-C03 Flashcards
| Front | Back |
| Difference between RTO and RPO | Recovery Time Objective focuses on downtime while Recovery Point Objective focuses on data loss tolerance. |
| How do EC2 status checks contribute to fault tolerance | By monitoring instance health and automatically recovering unhealthy instances. |
| How do Route 53 health checks support High Availability | By monitoring resources and routing traffic away from failed endpoints. |
| How does Amazon DynamoDB achieve high availability | By replicating data across multiple zones and offering eventually consistent reads. |
| How does Amazon SQS achieve fault tolerance | Queue messages are replicated and durable across multiple Availability Zones. |
| How does Elastic Load Balancing support High Availability | By distributing incoming traffic across multiple targets in multiple Availability Zones. |
| How does S3 cross-region replication help in disaster recovery | By automatically copying objects across regions for redundancy. |
| Key benefit of Elastic File System (EFS) for fault tolerance | EFS provides scalable, multi-AZ file storage that persists even during failures. |
| Key difference between Multi-AZ and Read Replica in RDS | Multi-AZ enhances availability; Read Replica is primarily for scaling workloads. |
| Use of AWS Lambda for Fault Tolerance | Lambda's automatic scaling and multi-AZ availability ensure high fault tolerance for applications. |
| What does AWS Auto Scaling do | Automatically adjusts capacity to maintain consistent performance and availability. |
| What does AWS CloudFormation ensure in high availability setups | Automated resource creation and updates across multiple regions/zones. |
| What is a quorum-based failover in databases | A failover model requiring a majority vote from nodes to confirm decision-making. |
| What is AWS Global Accelerator | A service that improves application availability through intelligent routing and global endpoints. |
| What is Fault Tolerance | The ability of a system to continue functioning even when one or more components fail. |
| What is High Availability | The ability of a system to remain operational and accessible for maximum time with minimal downtime. |
| What is Multi-AZ in AWS RDS | A deployment configuration that provides automatic failover to a secondary database in a different availability zone. |
| What is Pilot Light Disaster Recovery | A minimal backup environment with essential services ready to scale when needed. |
| What is the principle of a hot standby for disaster recovery | Maintaining a fully operational secondary environment that can take over instantly. |
| Why use AWS Backup | To centralize and automate backup for resources across various AWS services ensuring data resilience. |
This deck explores ensuring business continuity through strategies for high availability, disaster recovery, and fault-tolerant architectures within AWS.