A broadcast storm is an abnormally high number of broadcasts overwhelming the network during a specific amount of time
Broadcast storms can disable a network within seconds
Broadcast storms can be caused by a hardware problem such as a faulty NIC or from a Layer 2 loop in the network
A host caught in a Layer 2 loop is not accessible to other hosts on the network
Spanning tree is enabled, by default, on Cisco switches to prevent Layer 2 loops from occurring