40 Mins
1. Virtual Private Cloud (VPC) Architecture & CIDR Design
Designing Cloud Virtual Private Networks
A VPC is an isolated virtual network dedicated to your cloud account. Designing resilient VPCs requires allocating RFC 1918 private IP blocks (e.g. 10.0.0.0/16) and dividing them across Availability Zones (AZs).
Visual Architecture: Multi-AZ Enterprise VPC Subnet Isolation
Public Subnet (10.0.1.0/24)
Route: 0.0.0.0/0 -> IGW
Application Load Balancer (ALB) | NAT Gateway (Elastic IP)
Private App Subnet (10.0.2.0/24)
Route: 0.0.0.0/0 -> NAT GW
EC2 Application Workloads (Stateful Security Group: Inbound Port 80/443 from ALB Only)
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