Date: Wed, 24 Mar 1999 16:25:05 -0600 (CST) From: "Jasper O'Malley" <jooji@webnology.com> To: Renaud Waldura <rwaldura@LIGOS.COM> Cc: "'Peter Brezny'" <peter@cyber1.net>, freebsd-isp@FreeBSD.ORG Subject: RE: switch vs bridge Message-ID: <Pine.LNX.4.02.9903241613160.12427-100000@mercury.webnology.com> In-Reply-To: <9141909996F1D011B8FF00A0C95A661B2E09CE@server.ligos.com>
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On Wed, 24 Mar 1999, Renaud Waldura wrote:
> No, because a brige shares the links between all ports, forwards the
> datagrams to all ports.
This is incorrect. You're thinking of a hub.
It breaks down like this:
Simple repeater - has two ports. Anything it hears on one port it copies
and blindly transmits ("repeats") on the other port. Does not check for
or retransmit in the case of a collision.
Hub - a multiport repeater. Anything it hears on any port is copied and
blindly retransmitted on all other ports. All devices connected to a hub
must operate in half-duplex mode (i.e. they can't talk and listen at the
same time).
Simple Bridge - has two ports. Maintains an internal table of MAC
addresses, keeping track of which devices are connected to which port.
Only transmits packets if it needs to transfer them from the segment on
one side to the segment on the other. Usually used to connect hubs and
separate networks into different "collision domains." DOES check for
collisions, and will retransmit.
Switch - a multiport bridge. Maintains an internal table of MAC addresses,
keeping track of which devices are connected to which ports. Devices
directly connected to a switch can operate in full-duplex mode.
Cheers,
Mick
The Reverend Jasper P. O'Malley dotdot:jooji@webnology.com
Systems Administrator ringring:asktheadmiral
Webnology, LLC woowoo:http://www.webnology.com/~jooji
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