Can someone explain me the difference between those three devices?
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A hub gets a message then sends a copy to everything it’s connected to in hopes that someone out there knows what to do with it.
A switch gets a message, and either delivers it directly to the intended recipient or tells the sender that there’s no such recipient.
A router is a switch that has a connection to multiple networks. If it gets a message and can deliver it to a local recipient, it does, otherwise it passes the message on to another network and lets it figure out what to do with it. Routers can also be programmed to direct specific types messages to specific computers, or block certain types of messages.
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