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Subnets

Subnets or subnetworks in Amazon VPC (Virtual Private Cloud) are divisions of a VPC's IP address range. You can launch Amazon Elastic Compute Cloud (Amazon EC2) instances into a selected subnet. When you create a subnet, you specify the CIDR block for the subnet, which is a subset of the VPC CIDR block. Each subnet must be associated with a route table, which controls the traffic flow between the subnets. There are two types of subnets: public and private. A public subnet is one in which the associated route table directs the subnet to the Internet Gateway (IGW) of the VPC. A private subnet does not have a route to the IGW and hence has no direct route to the internet.

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