AWS Certified Advanced Networking Specialty Practice Exam

You have created a public Amazon S3 bucket but cannot download objects from instances in the VPC. Which issue is least likely to cause this problem?

1. Not enough free IP addresses in your subnet

2. Incorrect bucket policy configuration

3. VPC security group restrictions

4. No internet connectivity in the VPC

The correct answer is: Not enough free IP addresses in your subnet

The issue least likely to cause problems when trying to download objects from a public Amazon S3 bucket from instances in the VPC is the availability of free IP addresses in the subnet. Here's why this is the case: When you create a public S3 bucket, the intention is for it to be accessible over the internet. Instances in your VPC can access the internet through an internet gateway, given that the instances are appropriately configured. If the subnet has insufficient IP addresses, it may impact the ability to launch new instances or connect additional devices, but existing instances with assigned IP addresses can still communicate over the internet as long as the other configurations are correct. In contrast, issues related to bucket policy configuration, VPC security group restrictions, and lack of internet connectivity directly affect the resources' ability to access the S3 bucket. Therefore, these factors are more likely to cause download issues than the availability of IP addresses in the subnet.