How would you explain AWS VPC, Subnets, and Security Groups to a junior engineer?

Answers use simple, clear English.

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Quick interview answer

Explain AWS VPC, Subnets, and Security Groups in one sentence, then a tiny example, then one “don’t do this” tip. Baseline: VPC CIDR, public/private subnets, IGW/NAT, route tables. Security groups stateful allow-lists; NACLs stateless.

Detailed answer

Junior-friendly explanation of AWS VPC, Subnets, and Security Groups: Plain English: Baseline: VPC CIDR, public/private subnets, IGW/NAT, route tables. Security groups stateful allow-lists; NACLs stateless. Tiny example: ALB in public subnets; ECS tasks in private; NAT for egress. One warning: 0.0.0.0/0 on SSH SG; databases in public subnets.

Full explanation

Keep jargon low, then layer detail. VPC CIDR, public/private subnets, IGW/NAT, route tables. Security groups stateful allow-lists; NACLs stateless. Private workloads without public IPs.

Follow-up questions

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Parent context — AWS VPC, Subnets, and Security Groups

Baseline: VPC CIDR, public/private subnets, IGW/NAT, route tables. Security groups stateful allow-lists; NACLs stateless.

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