Why Project-Based Learning Works: Building My First Port Scanner in Go

Introduction I spent four years studying Communication and Computer Networks at the Technical University of Kenya. I was fairly solid on theory and could explain TCP/IP handshakes, draw network topologies, and describe exactly what happens when a packet moves from one host to another. Then I joined Zone01 Kisumu, an environment that forced me to build something with the knowledge I had. That’s when I realized there’s a massive gap between knowing how networking works and knowing how to code it. This is the story of how I bridged that gap. Let me walk you through the journey; from building a concurrent port scanner in Go to developing a strong conviction that real projects are the fastest way to learn. To understand how this project pushed me, let’s start by explaining the technical challenge at its core: what exactly is a port scanner? A port scanner probes a target IP address and checks which of the listed ports are open, closed, or filtered. Tools like nmap do this at a professional