Module 10: Networking Fundamentals - How the Internet Actually Works

What is actually happening between a user clicking a button and your application returning a response?

Every application failure executives see at the symptom level traces back to a small number of networking realities at the cause level. This module gives non-engineering leaders the working model of how networks actually move data so they can read incident reports, evaluate vendor claims, and challenge architectural decisions without taking engineering's word for it.

What you'll learn in this module

• Packets, routing, and the postal-system analogy that makes the rest of networking intuitive
• The TCP/IP stack: what each layer does and which layer most application problems actually live in
• DNS, CDNs, and the load-balancing tier that determines whether your application stays available under real-world traffic patterns
• TLS, certificates, and the encryption-in-transit posture that any regulator or auditor now expects
• Network security fundamentals: firewalls, segmentation, zero-trust networking, and the architectural shifts that have replaced perimeter-based thinking

The full module is the bridge between application-layer thinking and the network reality underneath it, written for non-engineers who still need to govern the decisions.