Wednesday, November 30, 2016

Why create subnets in AWS VPC?

When you create a VPC, it spans all of the Availability Zones in the region. After creating a VPC, you can add one or more subnets in each Availability Zone. 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 reside entirely within one Availability Zone and cannot span zones. 

Availability Zones are distinct locations that are engineered to be isolated from failures in other Availability Zones. By launching instances in separate Availability Zones, you can protect your applications from the failure of a single location. We assign a unique ID to each subnet.

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