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Hubs are stupid. They rebroadcast incoming messages out through all ports.
A switch has a bit of a brain in it. It "knows" who is where, reads the header packets, and passes the incoming packets out on the correct port only. In larger networks, this is an immense bandwidth saver. It also nearly eliminates packet collisions, which will speed up transfers considerably from one machine to another.
MPEDrummer
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My sig can beat up your honor student.
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