Answer: Configure an S3 gateway endpoint.

## Explanation **Correct Answer: A - Configure an S3 gateway endpoint.** **Why this is correct:** 1. **S3 Gateway Endpoint** is a VPC endpoint specifically designed for Amazon S3 that enables private connectivity between your VPC and S3 without requiring an internet gateway, NAT device, VPN connection, or AWS Direct Connect. 2. **No internet traffic**: When you configure an S3 gateway endpoint, traffic between your VPC and S3 stays within the AWS network and never traverses the public internet, meeting the security requirement. 3. **Direct VPC-to-S3 routing**: The gateway endpoint creates a route in your VPC route table that directs S3 traffic through the AWS private network. **Why other options are incorrect:** **B. Create an S3 bucket in a private subnet.** - S3 buckets are not deployed in subnets; they are regional services accessible via endpoints. - S3 buckets exist at the regional level, not within VPC subnets. **C. Create an S3 bucket in the same AWS Region as the EC2 instances.** - While this reduces latency, it doesn't prevent internet traffic. EC2 instances would still need to traverse the internet to reach S3 unless a VPC endpoint is configured. **D. Configure a NAT gateway in the same subnet as the EC2 instances.** - A NAT gateway allows outbound internet access for private instances, but traffic still goes through the internet to reach S3. - This would violate the requirement of "no traffic from the applications is allowed to travel across the internet." **Key AWS Concepts:** - **VPC Endpoints**: Provide private connectivity to AWS services without internet access. - **Gateway Endpoints**: Specifically for S3 and DynamoDB, using route table entries. - **Interface Endpoints**: For other AWS services, using ENIs in your VPC. **Security Benefits:** - Eliminates exposure to internet threats - Maintains data privacy within AWS network - Complies with strict security regulations - No additional cost for data transfer within the same region

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