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Networking · medium

3. VPCs, Subnets, and Security Groups

Building private and public network boundaries in AWS.

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An Amazon VPC is an isolated virtual network. Public subnets have a route to an internet gateway; private subnets normally reach the internet through a NAT gateway for outbound-only access. Route tables decide where packets go.

Security groups are stateful instance-level firewalls. Network ACLs are stateless subnet-level rules. A common production layout places public load balancers in public subnets and application/database resources in private subnets.

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Check your understanding

  1. 1. Where should a database usually live in a standard three-tier AWS design?

  2. 2. What is a key property of a security group?

  3. 3. What does a route table control?

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