VPC Gateway Endpoint for S3: Private S3 Access Without Internet

• ✓ A.Create a VPC gateway endpoint for S3 and attach an endpoint policy that restricts access to the specific bucket
• B.Establish a VPN connection to the on-premises network and route through it
• C.Set up a NAT gateway in the public subnet and route private subnet traffic to it
• D.Deploy a proxy server in the public subnet and configure the instance to use it

Why A: Option A is correct because a VPC gateway endpoint for S3 allows private subnet instances to access S3 without traversing the internet. Option B is wrong because a VPN connection is used to connect to on-premises networks, not to access S3 privately. Option C is wrong because a NAT gateway still routes traffic through the internet. Option D is wrong because a proxy server also introduces internet connectivity.

• ✓ A.Create a VPC Gateway Endpoint for Amazon S3 and ensure the patches are hosted in S3. Route private subnet traffic to the endpoint.
• B.Attach an internet gateway to the VPC and route the private subnet's default route to a NAT gateway in the public subnet.
• C.Launch a NAT instance in the public subnet and route the private subnet's default route to it.
• D.Attach an internet gateway to the VPC and assign a public IP to the EC2 instance.

Why A: The correct answer is Option A. A VPC Gateway Endpoint for Amazon S3 provides private connectivity to S3 without traversing the internet, eliminating data transfer costs and avoiding exposure to inbound traffic. Option D is incorrect because assigning a public IP and using an internet gateway would expose the instance to inbound traffic. Option B (NAT gateway) and Option C (NAT instance) incur data transfer costs and are not required when the patches are in S3 and can be accessed via a gateway endpoint.

• A.Attach an internet gateway to the VPC and assign a public IP to the instance
• ✓ B.Create a VPC endpoint for S3 (Gateway type) and update the route table
• C.Set up a VPN connection to the S3 bucket
• D.Deploy a NAT gateway in the public subnet and route traffic through it

Why B: The correct solution is to create a VPC endpoint for S3 (Gateway type) and update the route table. This allows the EC2 instance in the private subnet to access S3 privately without traversing the internet or using a NAT gateway. Option A is incorrect because attaching an internet gateway and assigning a public IP would expose the instance to the internet. Option C is incorrect because a VPN connection is not necessary for S3 access and would involve additional complexity. Option D is incorrect because a NAT gateway would route traffic through the internet, which the company wants to avoid.

• A.Attach an Internet Gateway to the VPC and route the private subnet traffic directly to S3.
• ✓ B.Create a Gateway VPC Endpoint for S3 and add a route in the private subnet's route table to the endpoint.
• C.Create an Interface VPC Endpoint for S3 in the private subnet.
• D.Deploy a NAT Gateway in a public subnet and route the private subnet traffic through it to access S3.

Why B: Option B is the most cost-effective solution because a Gateway VPC Endpoint for S3 provides private connectivity to S3 without any hourly charges, and it does not require a NAT Gateway or Internet Gateway. Option A is incorrect because an Internet Gateway would route traffic through the internet, which violates the requirement and is not cost-effective. Option C is incorrect because an Interface VPC Endpoint for S3 incurs hourly charges, making it more expensive than a Gateway Endpoint. Option D is incorrect because a NAT Gateway also incurs hourly and data processing charges, and it routes traffic through the internet, which is not desired.

• ✓ A.Create a VPC Gateway Endpoint for S3
• B.Use an Internet Gateway and a public IP
• C.Set up a VPN connection to on-premises and access S3 via that
• D.Use a NAT Gateway and route traffic through it

Why A: A VPC Gateway Endpoint for S3 provides private connectivity to S3 without leaving the AWS network, at no additional cost. Option B is incorrect because using an Internet Gateway with a public IP would expose the instance to the internet and incur data transfer costs. Option C is incorrect because a VPN connection to on-premises adds unnecessary complexity and cost for accessing a service within the same region. Option D is incorrect because a NAT Gateway would require a public IP and incur costs, and S3 traffic would still traverse the internet; a Gateway Endpoint is more secure and cost-effective.