How many Internet Gateways can you attach to an Amazon VPC at any one time?

An Amazon Virtual Private Cloud (VPC) can have only one Internet Gateway attached to it at any given time. The Internet Gateway serves as a bridge that allows communication between the instances in your VPC and the internet. It enables your instances to directly communicate with the outside world, which is crucial for many applications that require internet access.

When you attach an Internet Gateway to a VPC, it provides a target in your route tables for internet-routable traffic. This means that all outbound traffic from your VPC that needs to go to the internet will route through this single Internet Gateway. Having just one Internet Gateway per VPC ensures clarity and simplicity in configuring network traffic, managing security rules, and maintaining public IP addressing for your resources.

Other options that suggest multiple Internet Gateways do not align with AWS's design; the architecture is purposefully built to handle each VPC's internet traffic efficiently through a single gateway. This design decision helps maintain structured and manageable networking within AWS environments.