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Which of the following is true about a broadcast storm?
Multiple copies of the same frame are sent over a looped network.
It will only happen in a defined subset of network addresses in the same network.
It is caused by the simultaneous transmission of any number of broadcasts along the network.
When a broadcast storm occurs a jam signal informs all devices in the network.
Broadcast storms are caused by loops in a layer two network. When a frame is sent to a switch that does not have the destination MAC within it's mac-address table, it is flooded out all ports except for the port that it was received on. The process repeats itself across each switch until a destination can be found. The down side is that since a switch should not see the same broadcast that it previously sent out, it is seen again, when there is a loop in the network. And the source MAC address that originated the frame is seen on all ports that flooded the packet in search of a destination. While the packet is constantly flooded until the switch can no longer process any other traffic and all resources will be continuously consumed until the loop is broken. "Switching loops can cause broadcast storms, but broadcast storms don't necessarily create switching loops." For more information, review https://learningnetwork.cisco.com/thread/4899
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