A network engineer has configured a private hosted zone using Amazon Route 53. The engineer needs to configure health checks for record sets within the zone that are associated with instances. How can the engineer meet the requirements?
A.
Configure a Route 53 health check to a private IP associated with the instances inside the VPC to be checked.
B.
Configure a Route 53 health check pointing to an Amazon SNS topic that notifies an Amazon CloudWatch alarm when the Amazon EC2 StatusCheckFailed metric fails.
C.
Create a CloudWatch metric that checks the status of the EC2 StatusCheckFailed metric, add an alarm to the metric, and then create a health check that is based on the state of the alarm.
D.
Create a CloudWatch alarm for the StatusCheckFailed metric and choose Recover this instance, selecting a threshold value of 1.
C is the only correct answer.
A is wrong. Route 53 health checkers are outside the VPC. To check the health of an endpoint within a VPC by IP address, you must assign a public IP address to the instance in the VPC.
https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/dns-failover-private-hosted-zones.html
A - (Health checks that monitor an endpoint) - can be a solution but is not scalable and prone to error, as the question says "instances" - its not a single instance.
C - Health checks that monitor CloudWatch alarms - Correct Answer
C . You can create a CloudWatch metric, associate an alarm with the metric, and then create a health check that is based on the data stream for the alarm. For example, you might create a CloudWatch metric that checks the status of the EC2 StatusCheckFailed metric, add an alarm to the metric, and then create a health check that is based on the data stream for the alarm.
A. A. Configure a Route 53 health check to a private IP associated with the instances inside the VPC to be checked.
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