If A, B, and C all send to D simultaneously then yes, a collision
still happens. You can't avoid the collision in that case. The
benefit of a switch is that A can send to C at the same time that B
sends to D, without causing a collision. On a hub, *any* two
simultaneous transmissions will collide, even if they don't have a
host in common.
The other benefit to a switch is that it offers dedicated, full-duplex
bandwidth for each port, rather than shared, half-duplex bandwidth for
all ports (what you get from a hub).
> -----Original Message-----
> From: Michael Ryan Byrd [mailto:[EMAIL PROTECTED]
> Sent: Thursday, September 04, 2003 09:51
> To: BYU Unix Users Group
> Subject: [uug] switching
>
>
> ok, so an ethernet hub creates one big collision domain, that is to
> say, that all the hosts plugged into the hub have the possibility of
> colliding (transmitting at the same time) with each other.
>
> A switch is supposed to create separate collision domains (AFAIK.)
> But what if we have a four port switch(A,B,C,D) and A,B and C all
> try to send a packet to D at the same time. Would a collision
> happen?
>
> Ryan
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