Exam AWS Certified Solutions Architect - Associate SAA-C03 topic 1 question 115 discussion

Option A (creating a NAT gateway) would not meet the requirement since it still involves sending traffic to S3 over the internet. NAT gateway is used for outbound internet connectivity from private subnets, but it doesn't provide a private route for accessing S3. Option B (configuring security groups) focuses on controlling outbound traffic using security groups. While it can restrict outbound traffic, it doesn't provide a private route for accessing S3. Option D (setting up Direct Connect) involves establishing a dedicated private network connection between the on-premises environment and AWS. While it offers private connectivity, it is more suitable for hybrid scenarios and not necessary for achieving private access to S3 within the VPC. In summary, option C provides a straightforward solution by moving the EC2 instances to private subnets, creating a VPC endpoint for S3, and linking the endpoint to the route table for private subnets. This ensures that file transfer traffic between the EC2 instances and S3 remains within the private network without going over the internet.

The correct answer is C. Move the EC2 instances to private subnets. Create a VPC endpoint for Amazon S3, and link the endpoint to the route table for the private subnets. To meet the new requirement of transferring files over a private route, the EC2 instances should be moved to private subnets, which do not have direct access to the internet. This ensures that the traffic for file transfers does not go over the internet. To enable the EC2 instances to access Amazon S3, a VPC endpoint for Amazon S3 can be created. VPC endpoints allow resources within a VPC to communicate with resources in other services without the traffic being sent over the internet. By linking the VPC endpoint to the route table for the private subnets, the EC2 instances can access Amazon S3 over a private connection within the VPC.

Ans C - I was going for Ans D... ...but as well explained by Buruguduystunstugudunstuy (1 year, 8 mth ago), C is simpler: "Option C: Move the EC2 instances to private subnets. Create a VPC endpoint for Amazon S3, and link the endpoint to the route table for the private subnets. To meet the new requirement of transferring files over a private route, the EC2 instances should be moved to private subnets, which do not have direct access to the internet. This ensures that the traffic for file transfers does not go over the internet. "Option D (Remove the internet gateway from the VPC and set up an AWS Direct Connect connection) would not be necessary, as the requirement can be met by simply creating a VPC endpoint for Amazon S3 and routing traffic through it."

C is the correct answer.

C. Move the EC2 instances to private subnets. Create a VPC endpoint for Amazon S3, and link the endpoint to the route table for the private subnets.

Move the EC2 instances to private subnets. Create a VPC endpoint for Amazon S3, and link the endpoint to the route table for the private subnets.

link VPC endpoint in route tables ---- EC2 instance to communicate S3 with a private connection in VPC

According to the well-designed framework, option C is the safest and most efficient option.

Option C

C is correct. There is no requirement for public access from internet. Application must be moved in Private subnet. This is a prerequisite in using VPC endpoints with S3 https://aws.amazon.com/blogs/storage/managing-amazon-s3-access-with-vpc-endpoints-and-s3-access-points/

C is correct

Use VPC endpoint

User VPC endpoint and make the EC2 private

VPC endpoint is the best choice to route S3 traffic without traversing internet. Option A alone can't be used as NAT Gateway requires an Internet gateway for outbound internet traffic. Option B would still require traversing through internet and option D is also not a suitable solution