suma143
Registrato: 05/06/10 12:39
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 Inviato: Sab Giu 05, 2010 12:42 pm Oggetto: A Bridge is a box with ports |
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A Bridge is a box with ports (usually two) to LAN segments. It operates in promiscuous mode at the data link layer (i.e. at the level of frames, not signals), it examines all frames and it recognizes where they came from, and where they are going to. It selectively (frame filtering) transfers frames from any port to other ports. It does not propagate noise signals and defective frames as it was the case for repeaters (at the physical layer). It adaptively recognizes which machines are reacheable from a port. It reduces traffic on each port and it improves security since each port will only transmit frames directed to nodes reacheable from that port (thus one does not overhear irrelevant traffic).
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