The physical layer through the attacker’s eyes: why the network does not start with IP

▤ Summary

This article explains how attackers can operate below the IP layer and why defenders need to watch the physical and link layers of a network. It walks through techniques involving WiFi, Ethernet taps, IDS bypass concepts, and MITM-style access on wired networks. It also covers USB-based attacks such as BadUSB and malicious cables, showing how they can create hidden keyboard or network interfaces. The piece closes with practical defenses like NAC, 802.1X, USB controls, EDR, and port security.

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