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What is switch flooding?

Updated: 11/7/2022
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14y ago

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Switch flooding is an attack that consists of two parts: one part is a denial of service attack, and the other piece (if used) is an attempt to retrieve confidential information from the switch.

In a flooding attack, the switch is flooded with multiple MAC addresses. Normally a MAC address is used to determine which port to switch the frame to, bypassing any clients that should not get the frame.

Since a switch has a limited amount of memory for storing MAC addresses the flooding attack overruns the table and causes a fail-over situation, where the frames are repeated out each port (like a hub) rather than switching to a specific port.

A malicious user with a packet sniffer could possibly be listening for confidential information to be repeated out one of the ports.

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Q: What is switch flooding?
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