Reliability and business continuity
Practise only this domain. 96 questions with explanations, 20 at a time.
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- An RDS for MySQL database must survive an Availability Zone failure with automatic failover and no changes to application connection code. Which configuration meets that?Easy
- A Route 53 health check should report unhealthy only when a specific CloudWatch alarm is in the ALARM state. Which health check type should be created?Medium
- An operator accidentally deleted rows in an Aurora MySQL cluster two hours ago. The team must return the cluster to a point before the mistake without restoring a snapshot or creating a new cluster. Which feature applies?Hard
- An Auto Scaling group must add capacity quickly when CPU passes 70 percent, but must remove capacity slowly to avoid flapping. How should scaling be configured?Medium
- A three-year Standard Reserved Instance for a steady production workload expires in two weeks. The workload will stay on the same instance family in the same Region for at least three more years, and the company wants maximum savings. What should it purchase?Medium
- What is the key availability benefit of Amazon EFS compared with a single EBS volume?Easy
- A company publishes an application at www.example.com through Route 53 failover routing, with a health check attached to the primary endpoint. The check starts reporting failures. Where do new DNS resolutions for the site go?Easy
- The monthly AWS bill jumps by 300 percent overnight. What should you check first to find which service and usage type is responsible?Easy
- A Spot Instance receives a two-minute interruption notice. What should the application do?Medium
- A CloudWatch alarm that already combines several metrics is maintained in this account. Route 53 should mark a health check unhealthy only when that alarm enters the ALARM state, and the health check should not probe any endpoint directly. What should be configured?Medium
- A healthcare company must back up EBS volumes, RDS databases, EFS file systems, and DynamoDB tables in two Regions. Recovery points must be undeletable for seven years, even by administrators with full account rights. Which setup satisfies this?Hard
- Among disaster recovery strategies, which one delivers the shortest recovery time and the smallest data loss, while also carrying the greatest ongoing expense?Easy
- An RDS Multi-AZ DB cluster runs one writer and two readable standby instances, each in a different Availability Zone. When the writer fails, what failover time does AWS state for this deployment?Hard