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MAC Flapping Definition: MAC Flapping is a network security issue where a switch receives frames from the same MAC address on multiple switch ports, potentially causing network instability due to incorrect MAC address table entries.
MAC Flapping occurs when a network switch receives frames from the same source MAC address on multiple switch ports within a short time frame. This phenomenon can lead to network instability, as the switch may have difficulty determining the correct port for forwarding frames, causing potential network disruptions and security vulnerabilities.