Amazon Web Services SAP-C02 Exam With Confidence Using Practice Dumps

Comprehensive and Detailed Explanation:

This question tests knowledge of private access patterns to Amazon S3 from:

resources inside a VPC, and

users in an on-premises environment connected through Site-to-Site VPN.

The correct answer is B because the company has two different traffic sources with different endpoint requirements.

Why B is correct

For the EC2 instance inside the private VPC:

An S3 gateway endpoint is the standard and most cost-effective method for private access from resources in the VPC to Amazon S3. With a gateway endpoint, traffic from the VPC to S3 stays on the AWS network and does not require a NAT gateway or internet gateway. This satisfies the requirement to remove the NAT gateways for the application’s S3 access.

For the on-premises users over the Site-to-Site VPN:

Gateway endpoints are for use within the VPC and are not accessed from on-premises networks over VPN or Direct Connect. To allow on-premises clients to access S3 privately through the VPC, the architecture needs an S3 interface endpoint with private DNS enabled. Interface endpoints create elastic network interfaces in the VPC and can be reached privately from connected on-premises environments, assuming routing and DNS are configured correctly.

Therefore, the combination is required:

S3 gateway endpoint for VPC resources

S3 interface endpoint with private DNS for on-premises access through VPN

This design allows both the EC2 application and on-premises users to access S3 without using the public internet.

Why A is incorrect

An S3 gateway endpoint works for VPC resources, but it does not provide private access for on-premises users over Site-to-Site VPN. On-premises networks cannot route directly to a gateway endpoint in the way described. That makes A incomplete and incorrect.

Why C is incorrect

Mountpoint for Amazon S3 is a way to mount an S3 bucket for file-like access from an EC2 instance or similar compute environment. It does not solve the connectivity requirement for on-premises users, and it does not address the broader network design requirement of private S3 access without NAT gateways for all stated users. It also does not replace the need for appropriate VPC endpoint architecture.

Why D is incorrect

Storage Browser for S3 is not the solution to provide private network connectivity for an application and on-premises users. It is unrelated to the core architecture requirement. The question is asking about private access paths to S3, not a user interface or client-side browser tool.

Key design principle being tested

This question checks whether you know the distinction between:

S3 gateway endpoints for traffic originating from within the VPC

S3 interface endpoints for private access from on-premises environments over hybrid connectivity

It also tests whether you understand that removing NAT gateways is possible for S3 access from private subnets when a VPC endpoint is used.

Final justification

Because the company needs:

private S3 access from an EC2 instance in a private VPC, and

private S3 access from on-premises users over VPN,

while removing NAT gateways,

the correct design is to use:

an S3 gateway endpoint for the VPC application, and

an S3 interface endpoint with private DNS for the on-premises users.

That makes B the best answer.

Comprehensive and Detailed Explanation:

Why C is the best answer

This question requires all of the following:

Bidirectional access between two separate AWS Organizations

Access to S3 buckets across accounts and organizational boundaries

Encryption at rest

Logging of all S3 bucket access

Buckets exist in different Regions

Option C is the best match because S3 Access Points are purpose-built to simplify and scale access management for shared S3 datasets. For cross-account or multi-team sharing scenarios, S3 Access Points let you define dedicated access paths and policies instead of overloading a single bucket policy. For encryption at rest, customer managed AWS KMS keys are the strongest fit when cross-account access must be explicitly controlled. For logging bucket-level object access, AWS CloudTrail is the correct service because S3 data events record object-level API activity such as GetObject and PutObject.

Why the other options are not correct

A. S3 Access Grants is not the best fit here

S3 Access Grants is designed primarily to grant S3 access to identities mapped from identity sources and simplify data access at scale. It is not the standard primary design choice for bidirectional bucket sharing between two separate organizations. The exam-focused architectural pattern for controlled cross-account S3 sharing is S3 Access Points plus policies, combined with KMS permissions and CloudTrail data events. Even though SSE-KMS and CloudTrail data events are good parts of the design, the access mechanism in A is not the best answer.

B. VPC networking services do not solve the main requirement

VPC peering, PrivateLink, and endpoint access controls are network connectivity controls. Amazon S3 is not shared between organizations by building VPC peering between their VPCs. Also, VPC Flow Logs record network flow metadata, not S3 object access. That means B fails the logging requirement and uses the wrong control plane for the access-sharing requirement.

D. Replication and SCPs do not provide bidirectional shared access

S3 Cross-Region Replication copies objects; it does not establish bidirectional shared access for both organizations to each other’s buckets. Service Control Policies also do not work the way this option describes. SCPs are guardrails within an AWS Organization; they are not shared between separate organizations to grant object access. In addition, S3 server access logging is not the best answer when the requirement is to collect logs of all S3 bucket access in an auditable way for object-level API actions. CloudTrail data events are the stronger and more exam-aligned choice for logging object access activity.

Key technical reasoning

Cross-account / cross-organization S3 access:

S3 Access Points are commonly used to provide distinct permissions and simplified policy management for different consumers of the same bucket. This is especially useful in multi-account environments.

Encryption at rest:

When access spans accounts or organizations, customer managed KMS keys are preferred because key policies and grants can explicitly authorize external principals. This gives finer control than SSE-S3 when cross-account governance matters.

Logging:

For S3 object-level operations, CloudTrail data events are the standard answer in AWS architecture questions. They record API activity such as GetObject, PutObject, and DeleteObject. This is more appropriate than VPC Flow Logs or relying only on S3 server access logging.

Regional aspect:

The fact that buckets are in us-east-1 and us-west-1 does not prevent cross-account access. S3 access control, KMS permissions, and CloudTrail can be configured in the relevant Regions.