Answer: Set up a gateway VPC endpoint for Amazon S3 in the VPC.

## Explanation **Correct Answer: B - Set up a gateway VPC endpoint for Amazon S3 in the VPC.** **Why this is correct:** 1. **VPC Endpoints for S3**: AWS provides VPC endpoints specifically for Amazon S3 that allow EC2 instances within a VPC to access S3 buckets without traversing the public internet. 2. **Traffic stays within AWS network**: Gateway VPC endpoints for S3 use AWS's private network infrastructure, ensuring traffic never leaves AWS's network and doesn't go over the public internet. 3. **Security and compliance**: This approach meets the requirement that "traffic must not traverse the internet" as it keeps all traffic within AWS's private network. 4. **No internet gateway required**: Unlike NAT gateways, VPC endpoints don't require internet gateways or NAT devices. **Why other options are incorrect:** **A. Create a private hosted zone by using Amazon Route 53.** - Private hosted zones are for DNS resolution within a VPC, not for creating private network connections to S3. - This doesn't prevent internet traversal for S3 traffic. **C. Configure the EC2 instances to use a NAT gateway to access the S3 bucket.** - NAT gateways route traffic through the internet, which violates the requirement that traffic must not traverse the internet. - While NAT gateways provide outbound internet access, they still use the public internet to reach S3. **D. Establish an AWS Site-to-Site VPN connection between the VPC and the S3 bucket.** - Site-to-Site VPN connections are for connecting VPCs to on-premises networks, not for connecting to AWS services like S3. - S3 doesn't support direct VPN connections; you need VPC endpoints instead. **Key AWS Concepts:** - **VPC Endpoints**: Private connections between your VPC and supported AWS services without using internet gateways, NAT devices, VPN connections, or AWS Direct Connect. - **Gateway VPC Endpoint**: Specifically for Amazon S3 and DynamoDB, these are gateway endpoints that route traffic to AWS services through AWS's private network. - **Interface VPC Endpoint**: Uses AWS PrivateLink for other AWS services, providing private IP addresses in your VPC. **Best Practice**: Always use VPC endpoints for accessing AWS services from within a VPC when you need to keep traffic within AWS's network for security, compliance, or performance reasons.

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