This field reports the fraudulent MAC address that an attacker used in a detected ARP spoofing attempt from a user-facing interface. Admins use this to identify the specific spoofed MAC an attacker tried to impersonate, aiding forensic investigation of the attack. For example, a zxAnArpAntiSpoofingFakedMac showing the gateway's MAC address would indicate an attacker attempted a man-in-the-middle attack by spoofing the router's identity.