Monitoring and Metrics

1. A company runs a web application across three AWS Regions. They want traffic automatically routed away from any Region where the application becomes unhealthy. Which AWS service and feature combination best achieves this?

• A.Amazon Route 53 with health checks and failover routing policy configured for each regional endpoint.✓ Correct
• B.AWS CloudFront with origin failover groups pointing to secondary origins in each Region.
• C.An Application Load Balancer with cross-zone load balancing and target group health checks enabled.
• D.AWS Global Accelerator with endpoint weights manually adjusted by an operations team on failure.

2. An Application Load Balancer (ALB) is sending traffic to an EC2 target group. Some instances are returning HTTP 500 errors. What ALB feature ensures those instances stop receiving new requests until they recover?

• A.Target group health checks that mark instances unhealthy after a configurable threshold of failed checks.✓ Correct
• B.CloudWatch alarms that trigger a Lambda function to deregister failing instances from the target group.
• C.Auto Scaling policies that terminate unhealthy instances and replace them with new ones automatically.
• D.Sticky sessions that pin each user to a specific instance so 500 errors are isolated per session.

3. An EC2 instance hosts a critical database. The operations team wants AWS to automatically restart the instance on the same host or a new host if an underlying hardware failure is detected. What is the simplest way to configure this?

• A.Create a CloudWatch alarm on the StatusCheckFailed_System metric with the EC2 Recover action as the alarm action.✓ Correct
• B.Configure an Auto Scaling group with a minimum capacity of 1 so a replacement instance launches on failure.
• C.Enable EC2 Instance Connect so administrators can remotely reboot the instance if hardware issues occur.
• D.Use AWS Systems Manager Automation to run a document that stops and restarts the instance on a schedule.

4. After configuring EC2 auto-recovery, a solutions architect wants to confirm which instance attributes are preserved during a recovery event. Which of the following is CORRECT?

• A.The instance ID, private IP addresses, Elastic IP addresses, and EBS volume attachments are all preserved after recovery.✓ Correct
• B.The instance ID is preserved but a new private IP address is assigned from the subnet CIDR range after recovery.
• C.All instance attributes are preserved except Elastic IP addresses, which must be reassociated manually after recovery.
• D.The instance is terminated and a new instance is launched from the AMI, so no attributes are preserved.

5. A DevOps engineer wants to receive an SNS notification when average CPU utilization across a fleet of EC2 instances exceeds 80% for two consecutive 5-minute periods. What should they configure?

• A.A CloudWatch alarm on the CPUUtilization metric with a threshold of 80%, a period of 300 seconds, and 2 evaluation periods required to trigger.✓ Correct
• B.A CloudWatch Events rule that matches EC2 CPU utilization events above 80% and routes them to an SNS topic.
• C.An AWS Config rule that evaluates EC2 CPU utilization against the desired threshold and notifies SNS on non-compliance.
• D.A CloudWatch Logs metric filter on EC2 system logs that counts CPU utilization entries exceeding 80% and sends an SNS alert.