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sudo tcpdump -i wlan0mon -c 10

He closed the laptop. The green title faded to a single reminder on his desktop background: download ethical hacking: sniffers course

But he practiced in the lab. He saw his own phone’s Instagram images reload through Wireshark. He felt powerful. Then he felt dirty. On the tenth night, the final challenge appeared. Not a technical test. A scenario. “You are at a coffee shop. The free Wi-Fi has no encryption. A student beside you is checking their bank account over HTTP, not HTTPS. You have your sniffer running by accident from a previous lab. You see their account number flash across your screen. Do you: sudo tcpdump -i wlan0mon -c 10 He closed the laptop

The title flashed on the screen in glowing green letters: He felt powerful

The roommate laughed uneasily. Leo didn’t.

Leo stared at it, his finger hovering over the mouse. He was a second-year computer science student, and for months he had felt like a fraud. He knew theory—OSI models, TCP/IP handshakes, routing tables—but the real world? The world of packets zipping through the air, of data whispering between devices? That was a black box.