Exam AWS Certified Advanced Networking - Specialty ANS-C01 topic 1 question 241 discussion

Private VIF - Used to access VPC resources (including VPC endpoints) over private IPs from on-premises. Interface endpoints for Amazon S3 - Allow access from on premises

Private Virtual Interface (VIF): A private VIF is used to access AWS services like Amazon S3 through your VPC. It enables private connectivity between your on-premises data center and your VPC over Direct Connect. S3 Gateway Endpoint: This is the appropriate endpoint type for Amazon S3. Gateway endpoints are the recommended way to connect to S3 from a VPC as they use route tables to direct traffic over the AWS private network to S3 without traversing the internet.

vote B

I pick B. All options can access S3. GW endpoint is free but interface endpoint isn't. Security wise we will pick private VIF not public VIF, and pick GW endpoint not interface endpoint.

How about (A) that has an S3 gateway (preferred as free) endpoint providing S3 for inside the VPC and the public VIF providing S3 service for the DC across DX.

https://docs.aws.amazon.com/AmazonS3/latest/userguide/privatelink-interface-endpoints.html you allow in-VPC applications to continue accessing Amazon S3 through the gateway endpoint, which is not billed. Then, only your on-premises applications would use interface endpoints to access Amazon S3.

Interface Endpoint for Amazon S3: Unlike gateway endpoints, interface endpoints (using AWS PrivateLink) are accessible from both inside the VPC and from external sources such as an AWS Direct Connect connection or VPN. This makes the interface endpoint the right choice when the application logs stored locally in the data center need to be uploaded to S3 over the Direct Connect connection.

C: because gateway endpoints are not accessible from sources outside the VPC (like DX)