9.1 TCP/IP & DNS
The fundamental protocols of the internet. Understanding how DNS resolution works is critical for debugging connectivity issues.
9.2 Load Balancing
Distributing network traffic across multiple servers. Layer 4 (Transport) vs Layer 7 (Application) load balancing.
9.3 VPCs & Subnets
Virtual Private Clouds (VPCs) allow you to provision a logically isolated section of the cloud. Subnets allow you to segment the network within a VPC.
9.4 Service Mesh (Istio/Linkerd)
A service mesh is a dedicated infrastructure layer for facilitating service-to-service communications between services or microservices, using a proxy.
🎯 Practical Exercise
Set up a VPC with public and private subnets, and configure a NAT gateway to allow instances in the private subnet to access the internet.