AWS Certified Solutions Architect – Professional (SAP-C02) — Question 112

A team collects and routes behavioral data for an entire company. The company runs a Multi-AZ VPC environment with public subnets, private subnets, and in internet gateway. Each public subnet also contains a NAT gateway. Most of the company’s applications read from and write to Amazon Kinesis Data Streams. Most of the workloads run in private subnets.

A solutions architect must review the infrastructure. The solution architect needs to reduce costs and maintain the function of the applications. The solutions architect uses Cost Explorer and notices that the cost in the EC2-Other category is consistently high. A further review shows that NatGateway-Bytes charges are increasing the cost in the EC2-Other category.

What should the solutions architect do to meet these requirements?

Answer options

• A. Enable VPC Flow Logs. Use Amazon Athena to analyze the logs for traffic that can be removed. Ensure that security groups are blocking traffic that is responsible for high costs.
• B. Add an interface VPC endpoint for Kinesis Data Streams to the VPC. Ensure that applications have the correct IAM permissions to use the interface VPC endpoint.
• C. Enable VPC Flow Logs and Amazon Detective. Review Detective findings for traffic that is not related to Kinesis Data Streams. Configure security groups to block that traffic.
• D. Add an interface VPC endpoint for Kinesis Data Streams to the VPC. Ensure that the VPC endpoint policy allows traffic from the applications.

Correct answer: D

Explanation

The correct answer is D because adding an interface VPC endpoint for Kinesis Data Streams allows the applications in private subnets to access Kinesis without incurring NAT gateway charges, thus reducing costs. Options A and C focus on analyzing and blocking traffic, which does not directly address the high NAT costs. Option B suggests adding an interface endpoint but does not mention ensuring proper permissions, making it less complete than D.