Week 4 Overview

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End goal for the trainees to understand on VPC (more on Load balancing later within the same diagram)

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It is recommended to refresh your memory around basics network concepts by going through Week 9 - Networking and APIs from the Core Program

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This week topics

Virtual Private Cloud (VPC)
Load Balancing and Scaling
101 on architecture diagram

Learning goals

Understand the underlying network architecture of a Cloud Solution
Isolate and secure resources within a VPC with control in/outbound
Get confortable architecting simple cloud layout and network flows

How this week is structured

The diagram above is the destination. Rather than presenting it all at once, the sections below build it one layer at a time — each one adds a single subnet and the AWS pieces that make it work, and ends by showing you where you are in the full picture.

Section	What it adds to the diagram	New concepts
VPC — An analogy	The empty building	VPC, regions, AZs, CIDR
Public subnets and Internet Gateway	Public subnet in AZ A + the web server	Subnets, route tables, Internet Gateway
Private subnet and NAT	Private subnet in the same AZ + the app server	Private routing, Bastion / SSM, NAT Gateway
Endpoint and security groups	Private subnet in AZ B + the database	Cross-AZ routing, VPC endpoints, Security Groups, NACLs
Putting it all together	The complete diagram, reassembled	Recap, request walkthroughs, self-check, cleanup

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