High Availability, Fault Tolerance, and Auto Scaling Flashcards

Which AWS feature enables an RDS database to automatically fail over to a standby replica in another Availability Zone?

Answer: RDS Multi-AZ

RDS Multi-AZ deployments maintain a synchronous standby replica in a different AZ and automatically fail over to it if the primary instance fails.

Which S3 feature allows you to automatically replicate objects to buckets in other AWS regions for disaster recovery?

Answer: Cross-Region Replication

S3 Cross-Region Replication automatically copies objects to a destination bucket in a different AWS region, supporting disaster recovery and latency reduction.

Which AWS service uses health checks to automatically route traffic away from unhealthy endpoints?

Answer: All of the above

ELB, Route 53, and Auto Scaling all perform health checks and route or terminate traffic away from unhealthy instances or endpoints.

What is the primary benefit of deploying resources across multiple AWS Availability Zones?

Answer: Protection against the failure of a single data center location

Distributing resources across multiple AZs ensures that if one AZ experiences an outage, other AZs continue serving traffic without interruption.

Which Auto Scaling scaling type lets you schedule capacity changes at specific times, such as before a known traffic surge?

Answer: Scheduled Scaling

Scheduled Scaling lets you set specific times and dates for Auto Scaling to automatically increase or decrease the desired capacity of your group.

What is the purpose of an Application Load Balancer's target group?

Answer: To route requests to registered targets like EC2 instances, containers, or IP addresses

A target group routes requests to one or more registered targets using a specified protocol and port, performing health checks on those targets.