Csc5113c -

The first time you see a DNS exfiltration tunnel—where someone encoded /etc/passwd into subdomain requests—it feels like magic. By the end of the lab, you realize it’s just math. Clever, terrifying math.

I was debugging a "simple" TCP congestion control algorithm for my CSC5113C project. The assignment was straightforward: modify the Linux kernel’s TCP stack to improve throughput over high-latency links. Straightforward, until it wasn't. csc5113c

In CSC5113C, the network isn't a series of tubes. It's a gladiator arena. Most networking courses teach you the OSI model, TCP state diagrams, and BGP routing. You memorize port numbers. You calculate checksums. You yawn. The first time you see a DNS exfiltration