Danh sách quiz

High Availability & Resilience

Multi-AZ, Multi-Region, fault tolerance, and resilience patterns.

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  1. Câu 1. A company runs a web application on EC2 instances in a single Availability Zone behind an Application Load Balancer. They want to improve availability in case the AZ experiences an outage. What is the SIMPLEST change to improve resilience?
  2. Câu 2. A company uses Amazon Aurora MySQL as their primary database. They need the database to survive an AZ failure with automatic failover in under 30 seconds. Which Aurora feature provides this?
  3. Câu 3. A global SaaS company needs their application to remain available even if an entire AWS Region goes down. They require read-write capability in multiple Regions with sub-second replication lag for their Aurora PostgreSQL database. Which solution meets these requirements?
  4. Câu 4. A company has web servers in two AWS Regions. They want Route 53 to direct users to the Region that provides the lowest latency. Which routing policy should they use?
  5. Câu 5. A company uses Route 53 with health checks for their multi-Region application. They want to implement a cascading failover: primary in us-east-1, secondary in eu-west-1, and tertiary in ap-southeast-1. Which Route 53 configuration achieves this?
  6. Câu 6. A company has endpoints in multiple AWS Regions and wants to improve availability and performance for global users. They need static anycast IP addresses and automatic failover between Regions in under 30 seconds. Which service should they use?
  7. Câu 7. A gaming company needs to route UDP traffic from global players to the nearest healthy game server with minimal latency. DNS-based routing is too slow due to client-side DNS caching causing 5-minute failover delays. Which solution eliminates this problem?
  8. Câu 8. A company uses Aurora MySQL and wants to ensure that their application automatically reconnects to the new primary instance after a failover without changing connection strings. Which Aurora feature enables this?
  9. Câu 9. A company processes orders through an SQS queue. Occasionally, malformed orders cause the processing Lambda function to fail repeatedly. These poison messages block the queue and delay processing of valid orders. How should they handle this?
  10. Câu 10. An Auto Scaling group is configured with a minimum of 4 instances across 2 Availability Zones. If one AZ experiences a complete failure, how many instances will the Auto Scaling group maintain?
  11. Câu 11. A company runs an active-passive multi-Region setup. During a DR drill, they discover that Route 53 failover takes several minutes because some clients cache the DNS response. How can they minimize failover time?
  12. Câu 12. A company uses Amazon ElastiCache for Redis as a session store for their web application. They need the cache to survive an AZ failure without data loss. Which ElastiCache configuration provides this?
  13. Câu 13. A company needs to replicate S3 objects across three AWS Regions for compliance. They require that all replicas are kept in sync within 15 minutes of the source write. Which S3 feature should they use?
  14. Câu 14. A company wants to ensure their Application Load Balancer distributes traffic evenly across instances in all Availability Zones, even when the number of instances per AZ is unequal. Which ALB feature should they enable?
  15. Câu 15. A company operates a Warm Standby DR setup with the primary Region in us-east-1 and a scaled-down environment in eu-west-1. During failover, they need to scale up the DR environment quickly. Which AWS service automates this scaling?