Networking and Compute Foundations

The backbone of any AWS architecture is the Virtual Private Cloud (VPC). Think of a VPC as your own private piece of the AWS cloud. It provides complete control over your virtual networking environment, including IP address ranges, subnets, and route tables.

Within a VPC, we typically deploy EC2 (Elastic Compute Cloud) instances. EC2 provides resizable compute capacity. Architecturally, you must decide on the “instance type” based on whether your application is CPU-intensive, memory-intensive, or requires high-speed networking.

Public vs. Private Subnets

A robust design pattern involves placing web servers in a Public Subnet (accessible from the internet) and databases or backend logic in a Private Subnet (no direct internet access). Communication with the outside world from a private subnet is handled via a NAT Gateway. This “Defense in Depth” strategy ensures your data layer is never directly exposed to the public web.

Core Infrastructure Check

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Where should a production database be placed for maximum security?

Public SubnetPrivate SubnetInternet GatewayEdge Location

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In this section, I learned:

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The role of a VPC in isolating resourcesHow to differentiate between EC2 instance types for varied workloadsThe architectural importance of Public vs. Private subnetsHow to secure backend resources from direct internet access