What is an aws internet gateway?
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See: http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Internet_Gateway.html for more information.
A is VPC component, it is a horizontally scaled, redundant, and highly available. The Internet Gateway (IGW) is managed by AWS.
A subnets traffic is routed to a IGW is a public subnet.
A subnets traffic that is not routed to the IGW is a private subnet.
Only 1 IGW per VPC is allowed.
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