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Wireless & Mobility · Intermediate

MAC Authentication Bypass (MAB)

Authenticating a device by sending its MAC address to RADIUS when it cannot perform 802.1X.

Definition

MAB is used for printers, cameras, and IoT devices. Because MAC addresses are easily spoofed, MAB should be combined with profiling and restrictive policies. MAC randomization on modern clients complicates MAC-based policies.

Exam tip

MAB is weak authentication; MAC addresses can be spoofed.

Related terms