When a switch receives a packet with a destination address that is not in its forwarding table, the switch will broadcast the packet to all of its ports.

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Quizplus · Accepted Answer

This is known as a broadcast storm, and it occurs when a network is flooded with broadcast packets. It can slow down or even crash the network, which is why it's important to configure switches with proper forwarding tables to minimize unnecessary broadcasts.

When a Switch Receives a Packet with a Destination Address