The broadcast or multicast frames created by any end point in the network will be received by the switches and flooded out of every port except the port that the frame was received on, creating a layer 2 loop between two switches. Imagine that Layer 2 loop prevention mechanism is not enabled or is broken on the switches somehow. Consider the figure below, in which two switches are connected to each other with multiple path. What are the reasons behind a network loop?Ī network loop occurs when there is more than one path exists between the source and destination.How does a switch know if a frame is broadcast, multicast or unicast?.What is broadcast, multicast, unicast and how does it work?.
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