QuestionQ272

Network Management and Operation

A company uses Amazon Route 53 to host a public hosted zone for example.com. A network engineer recently lowered the TTL on several records to 60 seconds. The network engineer wants to determine whether this change has increased the number of Route 53 queries beyond the expected levels the company established before the change. The network engineer must obtain the number of queries made to the example.com public hosted zone.

Which solution provides this information?

  • A Create a new trail in AWS CloudTrail to include Route 53 data events. Send logs to Amazon CloudWatch Logs. Set up a CloudWatch metric filter to count the number of queries and create graphs.
  • B Use Amazon CloudWatch to access the AWS/Route 53 namespace and to check the DNSQueries metric for the public hosted zone.
  • C Use Amazon CloudWatch to access the AWS/Route 53 Resolver namespace and to check the InboundQueryVolume metric for a specific endpoint.
  • D Configure logging to Amazon CloudWatch for the public hosted zone. Set up a CloudWatch metric filter to count the number of queries and create graphs.
Explanation

Amazon Route 53 automatically sends the query count for every public hosted zone to Amazon CloudWatch. The DNSQueries metric in the AWS/Route53 namespace reports the number of DNS queries Route 53 responds to for a hosted zone, using the HostedZoneId dimension. A shorter TTL can cause resolvers to forward more queries after cached records expire, which this metric can be used to assess. Monitoring hosted zones using Amazon CloudWatch

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