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He closed the laptop. The green title faded to a single reminder on his desktop background:

sudo tcpdump -i wlan0mon -c 10

He felt a chill. He had just watched someone else’s machine ask the internet a question. Legally, in his own home, on his own network, this was fine. But the implication was vast. download ethical hacking: sniffers course

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. He closed the laptop