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On Wed, 28 Apr 1999, Andy Thaggard wrote:
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>
> re,
> Having just completed my instructor training for the Cisco Networking
> Academy Program, the definition that Nico used is the most accurate to
> what I've seen Cisco and Fore teach. The examples of a hub being a
> multiport repeater and a switch being a multiport bridge is the most
> common term I have seen. Except, the switched hub (switch) will also
> forward all broadcasts to all ports unless configured into VLan's
> (usually, but not necessarily, logical grouping off of a switch port).
IMHO this is indeed the best description...
In other words, linux is currently a combo between a switch and a bridge,
and it needs to have a virtual ethernet device, where you do the rest of
the operations (ifconfig etc)... this needs to be fixed.. (IMHO again)
>
> My $.02
>
>
> >Repeater = two port device that copies ALL packets from one port to the
> > other port.
> >[Shared] Hub = multi-port device that copies ALL packets from one port
> > to ALL other ports.
> >Bridge = two port device that copies packets received on one port to the
> > other port if the destination is known to be located off of the
> > other port. ALL packets are copied whose destination address'
> > location is unknown. ALL broadcast packets are copied.
> >Switch[ed hub] = multi-port device that copies any packet received on
> > one port to the appropriate port such that the packet's
> > destination address is known to be located behind that
> > port.
> >
> >In other words:
> >
> >Bridge = a smart repeater
> >Switch[ed hub] = a smart hub
> >
> >Where "smart" means that hardware-address to port maps are dynamically
> >maintained (learned) by the device. The technique used to learn such
> >tables consists of noting the source hardware address of each incoming
> >packet as well as the port where the packet arrived.
> --
> Andy Thaggard
> Director of Technology
> Aberdeen School District
> The First Mississippi Public School Online
>
>
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