🌐 Computer Networks

Every time you open a website, send a message, or watch a video, dozens of networking protocols work silently to make it happen. This course demystifies all of it.

You will understand how data travels from your keyboard to a server thousands of miles away and back in milliseconds. We cover the OSI and TCP/IP models, IP addressing and subnetting, routing, DNS, HTTP/HTTPS, TCP vs UDP, network security, firewalls, VPNs, and SSL/TLS. Every concept is taught with real-world analogies — the postal service, telephone systems, highways — that make abstract protocols intuitive.