AWS Certified Solutions Architect – Associate (SAA-C03) — Question 197

A company needs to move data from an Amazon EC2 instance to an Amazon S3 bucket. The company must ensure that no API calls and no data are routed through public internet routes. Only the EC2 instance can have access to upload data to the S3 bucket.

Which solution will meet these requirements?

Answer options

• A. Create an interface VPC endpoint for Amazon S3 in the subnet where the EC2 instance is located. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
• B. Create a gateway VPC endpoint for Amazon S3 in the Availability Zone where the EC2 instance is located. Attach appropriate security groups to the endpoint. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
• C. Run the nslookup tool from inside the EC2 instance to obtain the private IP address of the S3 bucket’s service API endpoint. Create a route in the VPC route table to provide the EC2 instance with access to the S3 bucket. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.
• D. Use the AWS provided, publicly available ip-ranges.json file to obtain the private IP address of the S3 bucket’s service API endpoint. Create a route in the VPC route table to provide the EC2 instance with access to the S3 bucket. Attach a resource policy to the S3 bucket to only allow the EC2 instance’s IAM role for access.

Correct answer: A

Explanation

Option A is correct because creating an interface VPC endpoint allows secure communication between the EC2 instance and S3 without going through the public internet. Option B involves a gateway endpoint, which is not necessary for this use case, and options C and D suggest using DNS lookups or public IP ranges, which contradicts the requirement of avoiding public internet routes.