🌐 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.

The expanded curriculum includes applied modules on Encapsulation across the OSI model, Ethernet frames and MAC addressing, ARP and neighbour discovery, IPv4 subnetting with CIDR calculations, IPv6 addressing and compressed notation. Lessons pair formal models with worked examples, diagrams or traces, failure analysis, practice questions, and references for independent verification.