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Hub vs Bridge vs Switch


Hub
Layer: Physical Layer
Connects network segments (wires) and broadcast traffic (without knowing to know MAC). 

Bridge
Layer - Data Link Layer
Connects two network segments (wires) and forward packets based on the MAC. 
Can be a software or a hardware. 

Switch
Layer - Data Link Layer
Multiple bridges are implemented in a switch hence it can forward traffic between more than two network segments based on the MAC. 





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