ANS-C01 Question #39: Real Exam Question with Answer & Explanation

Question

A data analytics company has a 100-node high performance computing (HPC) cluster. The HPC cluster is for parallel data processing and is hosted in a VPC in the AWS Cloud. As part of the data processing workflow, the HPC cluster needs to perform several DNS queries to resolve and connect to Amazon RDS databases, Amazon S3 buckets, and on-premises data stores that are accessible through AWS Direct Connect. The HPC cluster can increase in size by five to seven times during the company's peak event at the end of the year. The company is using two Amazon EC2 instances as primary DNS servers for the VPC. The EC2 instances are configured to forward queries to the default VPC resolver for Amazon Route 53 hosted domains and to the on-premises DNS servers for other on-premises hosted domain names. The company notices job failures and finds that DNS queries from the HPC cluster nodes failed when the nodes tried to resolve RDS and S3 bucket endpoints. Which architectural change should a network engineer implement to provide the DNS service in the MOST scalable way?

Options

• AScale out the DNS service by adding two additional EC2 instances in the VPC. Reconfigure half
• BScale up the existing EC2 instances that the company is using as DNS servers. Change the
• CCreate Route 53 Resolver outbound endpoints. Create Route 53 Resolver rules to forward
• DCreate Route 53 Resolver inbound endpoints. Create rules on the on-premises DNS servers to