Eli5 Switch, Router and Hub
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Hub-Traffic enters a port and is replicated to all ports. Layer 1
Ethernet Switch-Traffic enters a port and is forwarded only to the port that has the mac address it is looking for. Layer 2.
Router-Traffic enters a port and is forwarded based on the routing table which is IP based. Layer 3.
It used to be that the devices were dumber and faster at lower levels and slower but more intelligent (expensive)at higher layers.
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