Private S3 Access From EC2 Without Internet

SAA-C03 By islever Editorial Last updated

Design secure access to AWS resources. Determine high-performing and/or scalable network architectures.

Short answer

A Create a gateway VPC endpoint for S3 so the EC2 instance reaches the bucket privately over the AWS network with no internet gateway or NAT device.

Question

An application runs on an Amazon EC2 instance in a VPC. The application processes logs that are stored in an Amazon S3 bucket. The EC2 instance needs to access the S3 bucket without connectivity to the internet.
Which solution will provide private network connectivity to Amazon S3?
  1. Create a gateway VPC endpoint to the S3 bucket. Correct Answer
  2. Stream the logs to Amazon CloudWatch Logs. Export the logs to the S3 bucket.
  3. Create an instance profile on Amazon EC2 to allow S3 access.
  4. Create an Amazon API Gateway API with a private link to access the S3 endpoint.

Key Takeaways

The question tests knowledge of VPC endpoint types for private AWS service access; the trap is choosing an IAM-based option (instance profile) or an indirect log-shipping path that never establishes private network connectivity.

This SAA-C03 scenario asks how an EC2 instance in a VPC can reach an Amazon S3 bucket entirely over the AWS network, with no internet gateway, NAT device, or public egress. The page confirms that a gateway VPC endpoint for S3 (option A) is the correct private-connectivity solution, while the other options address authorization, log routing, or an unrelated API front end.

Common mistake: Option C is the most tempting wrong pick: an instance profile grants the EC2 instance IAM permissions to call S3, but it changes nothing about the network path, so traffic still needs an internet gateway or NAT device to leave the VPC.

Expert Analysis

Why the Answer Is Correct

A gateway VPC endpoint is the AWS-native construct that gives a VPC private, network-level access to Amazon S3 without traversing the public internet. Once created, it is automatically added as a target in the VPC's route tables for the S3 prefix lists, so traffic from the EC2 instance stays on the AWS global network and no internet gateway or NAT device is required. Gateway endpoints for S3 and DynamoDB also incur no hourly charge, and you can further lock them down with endpoint policies and the aws:VpcSourceIp condition key. This directly satisfies the requirement of "private network connectivity to Amazon S3."

Why the Other Options Are Wrong

Option B routes logs through CloudWatch Logs and then exports them to S3, which is an indirect data-pipeline workaround rather than network connectivity, and export can take up to 12 hours plus it incurs extra ingestion and storage cost. Option C is purely an authorization control: an instance profile attaches an IAM role so S3 calls are permitted, but the underlying requests would still need internet egress, so the stated requirement is unmet. Option D misapplies PrivateLink, because API Gateway front-ending an S3 endpoint is not a supported design; S3 is reached via gateway or interface VPC endpoints, not through an API Gateway with a private link. Option D also adds an unnecessary API layer and latency for simple object access.

Community Comment Notes

Community consensus strongly supports option A, with PhucVuu noting that a "Gateway VPC endpoint can connect to S3 bucket privately without additional cost" and D2w adding that a VPC endpoint lets you "connect to AWS services using a private network instead of using the public Internet." Andreshere emphasizes that instance profiles "is not related to network connectivity," while rxwcl points out option D "would not provide private network connectivity" either. Aayush_786 summarizes the rule of thumb well: use a gateway endpoint for S3 and DynamoDB, an interface endpoint via PrivateLink for other AWS services, and PrivateLink for third-party SaaS or cross-account access.

Official Reference

These links open the official vendor documentation in a new tab.

Exam Strategy

When a question says "without internet connectivity" or "private connectivity to an AWS service," first identify which VPC endpoint type supports that service (S3 and DynamoDB = gateway endpoint; most others = interface endpoint/PrivateLink), then confirm the option also addresses the network path rather than only IAM permissions.

Frequently Asked Questions

Why doesn't an instance profile give the EC2 instance private access to S3?

An instance profile only attaches an IAM role so S3 API calls are authorized; it does not change the network path, so traffic would still require an internet gateway or NAT device.

Should I use an interface endpoint instead of a gateway endpoint for S3?

No. S3 and DynamoDB support gateway endpoints, which are free and route via route tables; interface endpoints (PrivateLink) are used for other AWS services.

More SAA-C03 FAQ →

Discussion 68 contributions

Compiled from public community threads and reader submissions, lightly edited for clarity. Handles and vote tallies are shown as recorded, and comments reflect the views of individual contributors.

From public community threads 30 of 68

  1. PhucVuu 👍 83 Answered A
    Keywords: - EC2 in VPC - EC2 instance needs to access the S3 bucket without connectivity to the internet A: Correct - Gateway VPC endpoint can connect to S3 bucket privately without additional cost B: Incorrect - You can set up interface VPC endpoint for CloudWatch Logs for private network from EC2 to CloudWatch. But from CloudWatch to S3 bucket: Log data can take up to 12 hours to become available for export and the requirement only need EC2 to S3 C: Incorrect - Create an instance profile just grant access but not help EC2 connect to S3 privately D: Incorrect - API Gateway like the proxy which receive network from out site and it forward request to AWS Lambda, Amazon EC2, Elastic Load Balancing products such as Application Load Balancers or Classic Load Balancers, Amazon DynamoDB, Amazon Kinesis, or any publicly available HTTPS-based endpoint. But not S3
  2. Andreshere 👍 6 Answered A
    A. Correct answer. The easiest way to get private network connectivity in S3 is using VPC gateway endpoint. This service is free, and it is integrated natively with S3. B. Amazon CloudWatch Logs only collects and monitors logs but natively has not mechanisms to use private connection. C. Instance profiles are used to assign IAM roles to an EC2 instance, but it is not related to network connectivity. D. API Gateway like the proxy which receive network from out site and it forward request to AWS Lambda, Amazon EC2, Elastic Load Balancing products such as Application Load Balancers or Classic Load Balancers, Amazon DynamoDB, Amazon Kinesis, or any publicly available HTTPS-based endpoint. But not S3.
  3. cookieMr 👍 4 Answered A
    Here's why Option A is the correct choice: Gateway VPC Endpoint: A gateway VPC endpoint allows you to privately connect your VPC to supported AWS services. By creating a gateway VPC endpoint for S3, you can establish a private connection between your VPC and the S3 service without requiring internet connectivity. Private network connectivity: The gateway VPC endpoint for S3 enables your EC2 instance within the VPC to access the S3 bucket over the private network, ensuring secure and direct communication between the EC2 instance and S3. No internet connectivity required: Since the requirement is to access the S3 bucket without internet connectivity, the gateway VPC endpoint provides a private and direct connection to S3 without needing to route traffic through the internet. Minimal operational complexity: Setting up a gateway VPC endpoint is a straightforward process. It involves creating the endpoint and configuring the appropriate routing in the VPC. This solution minimizes operational complexity while providing the required private network connectivity.
  4. Ruffyit 👍 4
    Keywords: - EC2 in VPC - EC2 instance needs to access the S3 bucket without connectivity to the internet VPC endpoint allows you to connect to AWS services using a private network instead of using the public Internet. With a gateway endpoint, you can access Amazon S3 from your VPC, without requiring an internet gateway or NAT device for your VPC, and with no additional cost. However, gateway endpoints do not allow access from on-premises networks, from peered VPCs in other AWS Regions, or through a transit gateway.
  5. Buruguduystunstugudunstuy 👍 3 Answered A
    CORRECT ANSWER The correct solution that will provide private network connectivity to Amazon S3 is Option A: Create a gateway VPC endpoint to the S3 bucket. EXPLANATION Option A involves creating a gateway VPC endpoint, which is a network interface in a VPC that allows you to privately connect to a service over the Amazon network. You can create a gateway VPC endpoint for Amazon S3, which will allow the EC2 instance in the VPC to access the S3 bucket without connectivity to the internet. Option B involves streaming the logs to Amazon CloudWatch Logs and then exporting the logs to the S3 bucket. This option would not provide private network connectivity to S3, as the logs would need to be exported over the internet.
Show 25 more comments
  1. Naneyerocky 👍 3 Answered A
    You can access Amazon S3 from your VPC using gateway VPC endpoints. After you create the gateway endpoint, you can add it as a target in your route table for traffic destined from your VPC to Amazon S3. You can create a policy that restricts access to specific IP address ranges by using the aws:VpcSourceIp condition key.
  2. SilentMilli 👍 3 Answered A
    A gateway VPC endpoint is a connection between your VPC and an AWS service that enables private connectivity to the service. A gateway VPC endpoint for S3 allows the EC2 instance to access the S3 bucket without requiring internet connectivity.
  3. MGKYAING 👍 2 Answered A
    A Gateway VPC Endpoint is designed to provide private network connectivity between resources in a VPC (such as EC2 instances) and services like Amazon S3 or DynamoDB without requiring an internet gateway, NAT gateway, or NAT instance. When a gateway VPC endpoint is set up for S3: Traffic between the EC2 instance and the S3 bucket stays within the AWS private network. This ensures secure, cost-efficient, and private access to the S3 bucket without requiring public internet connectivity.
  4. linux_admin 👍 2 Answered A
    Option A proposes creating a VPC endpoint for Amazon S3. A VPC endpoint enables private connectivity between the VPC and S3 without using an internet gateway or NAT device. This would provide the EC2 instance with private network connectivity to the S3 bucket.
  5. Aayush_786 👍 2 Answered A
    If accessing S3/DynamoDB privately: Use a Gateway VPC Endpoint. If accessing any other AWS service privately: Use an Interface Endpoint (via PrivateLink). If accessing third-party SaaS applications or services in another account/VPC: Use PrivateLink.
  6. channn 👍 2 Answered A
    Option B) not provide private network connectivity to S3. Option C) not provide private network connectivity to S3. Option D) API Gateway with a private link provide private network connectivity between a VPC and an HTTP(S) endpoint, not S3.
  7. pm2229 👍 2
    It's A, Private endpoints within your VPC that allow AWS services to privately connect to resources within your VPC without traversing the public internet (cheaper)
  8. TariqKipkemei 👍 2 Answered A
    A VPC endpoint enables customers to privately connect to supported AWS services and VPC endpoint services powered by AWS PrivateLink.
  9. ldruizsan 👍 2 Answered A
    Easiest way to avoid internet traffic is to use VPC endpoints to let services communicate with each other
  10. 48cd959 👍 2
    Answer -A VPC endpoints are created to access any AWS services privately without going to internet.
  11. Mikedodo 👍 2 Answered A
    Reduce Cost and Increase Security with Amazon VPC Endpoints
  12. K_SAA 👍 1 Answered A
    Keywords: log store in s3, Ec2 instance need to access to s3 bucket without internet A: use gateway vpc endpoint allow private network connectivity to s3 bucket without publishing to internet B: Stream the logs to Amazon CloudWatch Logs. Export the logs to the S3 bucket since the question need ec2 instance stay in vpc access to s3 bucket privately but this way do not grant access to s3 bucket C: Create an instance profile on Amazon EC2 to allow S3 access. This way only authorization access to s3 bucket, not grant private network connectivity to s3 bucket since this also need internet access D. Create an Amazon API Gateway API with a private link to access the S3 endpoint. Since API gateway acts like a proxy receive requests from outside and forward to the request to aws services like lambda, etc, not using for s3 access
  13. Buruguduystunstugudunstuy 👍 1
    Option C involves creating an instance profile on the EC2 instance to allow S3 access. While this option could potentially work, it would not provide private network connectivity to S3, as the EC2 instance would still need to access S3 over the internet. Option D involves creating an Amazon API Gateway API with a private link to access the S3 endpoint. This option would not provide private network connectivity to S3, as the API Gateway API is not a network interface that can be used to privately connect to S3. Overall, Option A is the correct solution for providing private network connectivity to Amazon S3 from an EC2 instance in a VPC.
  14. Guru4Cloud 👍 1 Answered A
    The answer is A. Create a gateway VPC endpoint to the S3 bucket. A gateway VPC endpoint is a private way to connect to AWS services without using the internet. This is the best solution for the given scenario because it will allow the EC2 instance to access the S3 bucket without any internet connectivity
  15. Bmarodi 👍 1 Answered A
    With a gateway endpoint, you can access Amazon S3 from your VPC, without requiring an internet gateway or NAT device for your VPC, and with no additional cost. However, gateway endpoints do not allow access from on-premises networks, from peered VPCs in other AWS Regions, or through a transit gateway.
  16. bilel500 👍 1 Answered A
    VPC endpoint enables creation of a private connection between VPC to supported AWS services and VPC endpoint services powered by PrivateLink using its private IP address. Traffic between VPC and AWS service does not leave the Amazon network.
  17. psr83 👍 1 Answered A
    A gateway endpoint targets specific IP routes in an Amazon VPC route table, in the form of a prefix-list, used for traffic destined to Amazon DynamoDB or Amazon S3. Gateway endpoints do not enable AWS PrivateLink.
  18. Mrigraj12 👍 1 Answered A
    Create gateway endpoint to access s3 bucket so as the ec2 will not require to go over the internet to access s3 bucket and the process will be fast and cheap also!
  19. james2033 👍 1 Answered A
    Keyword (1) EC2 in a VPC. (2)EC2 instance need access S3 bucket WITHOUT internet. Therefore, A is correct answer: Create a gateway VPC endpoint to S3 bucket.
  20. melvis8 👍 1 Answered A
    The correct answer is A because a gateway endpoint allows us to securely and cost efficiently access either an S3 or Amazon DynamoDB database within our VPC
  21. TilTil 👍 1 Answered A
    VPC Endpoint is the TOP Notch choice, allows services to connect via private could. VPC literally means virtual private cloud. Best choice
  22. KZM 👍 1
    You can use two types of VPC endpoints to access Amazon S3: gateway endpoints and interface endpoints (using AWS PrivateLink).
  23. ernie1976 👍 1 Answered A
    It is a simple communication between EC2 and S3, it is no needed to go out to internet, so and endopint is the best solution.
  24. Clouddon 👍 1 Answered A
    Use a Gateway VPC Endpoint for S3 to enable secure, private access to the S3 bucket from EC2 without internet connectivity.
  25. Folayinka 👍 1
    A VPC endpoint allows you to connect from the VPC to other AWS services outside of the VPC without the use of the internet.

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