AWS Certified Advanced Networking Specialty Practice Exam

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If there are connectivity issues for VPC instances accessing S3 through a VPC endpoint, what might help troubleshoot the issue?

Creating additional IAM user keys
Ensuring bucket policy includes the VPC
Restarting Amazon VPC
Implementing CloudTrail for logging

The correct answer is: Ensuring bucket policy includes the VPC

When troubleshooting connectivity issues for VPC instances accessing S3 through a VPC endpoint, it is essential to ensure that the bucket policy correctly allows access from the VPC. The bucket policy defines the permissions for who can access a specific S3 bucket and can include conditions based on the VPC from which access is attempted. If the bucket policy does not explicitly allow access from the VPC or the VPC endpoint, the instances will not be able to reach the S3 bucket, resulting in connectivity failures. Therefore, verifying and, if necessary, updating the bucket policy to include the specific VPC or its endpoint as a trusted source is a critical step in troubleshooting. The other options, while potentially useful in different contexts, do not address the immediate concern of ensuring proper permissions are in place for accessing the S3 bucket through the VPC endpoint.