AWS Certified Advanced Networking – Specialty (ANS-C01) — Question 148

A real estate company is using Amazon Workspaces to provide corporate managed desktop service to its real estate agents around the world. These Workspaces are deployed in seven VPCs. Each VPC is in a different AWS Region.

According to a new requirement, the company’s cloud-hosted security information and events management (SIEM) system needs to analyze DNS queries generated by the Workspaces to identify the target domains that are connected to the Workspaces. The SIEM system supports poll and push methods for data and log collection.

Which solution should a network engineer implement to meet these requirements MOST cost-effectively?

Answer options

• A. Create VPC flow logs in each VPC that is connected to the Workspaces instances. Publish the log data to a central Amazon S3 bucket. Configure the SIEM system to poll the S3 bucket periodically.
• B. Configure an Amazon CloudWatch agent to log all DNS requests in Amazon CloudWatch Logs. Configure a subscription filter in CloudWatch Logs. Push the logs to the SIEM system by using Amazon Kinesis Data Firehose.
• C. Configure VPC Traffic Mirroring to copy network traffic from each Workspace and to send the traffic to the SIEM system probes for analysis.
• D. Configure Amazon Route 53 query logging. Set the destination as an Amazon Kinesis Data Firehose delivery stream that is configured to push data to the SIEM system.

Correct answer: D

Explanation

The correct answer is D because configuring Amazon Route 53 query logging directly captures and pushes DNS query logs efficiently to the SIEM system, fulfilling the requirement. Options A and B involve additional steps and may incur higher costs due to S3 storage and CloudWatch usage. Option C, while effective for traffic analysis, is more complex and potentially more expensive than necessary for simply analyzing DNS queries.