MAC flooding occurs when a single device sends many different MAC addresses to a switch, causing it to overflow its ARP table and begin sending traffic to incorrect ports, potentially causing a breach of sensitive information. Input validation is a control used to protect applications from user input, so that’s not relevant here. Port tapping is used to gain access to network traffic being sent through a switch, so we don’t need that either. And protocol validation is used to verify the contents of network traffic, so it’s also not the correct answer. MAC flooding can be prevented through the use of port security mechanisms, which limit the number of MAC addresses allowed from a single network port