Architecting on AWS Certification High Availability & Fault Tolerance Flashcards
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Which AWS service enables you to distribute incoming application traffic across multiple targets, such as EC2 instances, in multiple Availability Zones?
Answer: Elastic Load Balancing
Elastic Load Balancing automatically distributes incoming traffic across multiple targets in one or more Availability Zones to increase fault tolerance.
What is the minimum number of Availability Zones recommended when designing a highly available architecture on AWS?
Answer: 2
AWS recommends deploying across at least 2 Availability Zones so that if one AZ fails, the application continues running in the other.
Which Amazon RDS feature automatically creates a standby replica in a different Availability Zone and promotes it if the primary fails?
Answer: Multi-AZ deployment
RDS Multi-AZ maintains a synchronous standby replica in a different AZ and automatically fails over to it during outages.
An architect wants an S3-based static website to withstand the failure of an entire AWS Region. Which feature should be configured?
Answer: S3 Cross-Region Replication
S3 Cross-Region Replication asynchronously copies objects to a bucket in another Region, enabling region-level fault tolerance.
Which Route 53 routing policy sends traffic to the healthiest endpoint and can automatically failover when a primary endpoint becomes unhealthy?
Answer: Failover routing
Route 53 Failover routing directs traffic to a primary resource and automatically routes to a secondary resource when health checks detect a failure.
What AWS feature allows an Auto Scaling group to replace unhealthy EC2 instances automatically without manual intervention?
Answer: Health check replacement
Auto Scaling groups perform periodic health checks and automatically terminate and replace any instance that fails the check.