Further to my original post...
It is possible to get collisions on a Full Duplex segment. Transmission
from the switch towards the destination is a shared bandwidth domain (with
other originating hosts transmitting towards the same destination). As such
collisions may occur on the transmit from the switch towards the
destination. CSMA/CD is used to overcome this. This may be done internally
within the switch (buffering of frames etc) but it is still there...
Keith
""Joe Martin"" <[EMAIL PROTECTED]> wrote in message
8fbq4s$80t$[EMAIL PROTECTED]">news:8fbq4s$80t$[EMAIL PROTECTED]...
> Full duplex transmission requires a point to point connection between two
> devices. This is achieved using a switch. Since the connection is
between
> two and only two devices at a time, this allows them to transmit and
receive
> at the same time. Thus a collision would never occur and CSMA/CD is
> unnecessary.
>
> JOE
> CCNP, CCDP, and a few other things...
>
>
> "Dan West" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Sorry to ask such a simple question--but the CCNA book
> > is still unclear as to what's going on.
> >
> > Half-duplex ethernet uses CSMA/CD for arbitration on
> > the link. Does full duplex use it as well for
> > arbitration? The book makes it sound like if you are
> > running full-duplex that the CSMA/CD is not necessary.
> > It mentions half-duplex looping a duplicate frame onto
> > the recieve wire from the transmit wire.
> >
> > Thanks.
> >
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