September 2018
Beginner to intermediate
174 pages
3h 27m
English
Content preview from Designing AWS Environments
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What are subnets?
Subnets are separate portions of the VPC. EC2 instances must be launched into a subnet, so at least one subnet is required for a VPC. To create a subnet, you have to define a CIDR block for it, which is a subset of the VPC's CIDR block. Every subnet in a VPC has to have a unique range of addresses. There can't be any overlap, or else there would be a duplicate IP address in your network.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.