Re: Is it possible to bridge three NIC on a Windows 2000 Server
From: Herb Martin (news_at_LearnQuick.com)
Date: 02/16/05
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Date: Wed, 16 Feb 2005 12:47:50 -0600
"Phillip Windell" <@.> wrote in message
news:OVX$kuDFFHA.3244@TK2MSFTNGP15.phx.gbl...
> "Herb Martin" <news@LearnQuick.com> wrote in message
> news:un1RZHsEFHA.2052@TK2MSFTNGP09.phx.gbl...
> > No, I meant "do NOT" but I certainly see where confusion
> > is possible.
>
> Well, I'm still confused but I trust your judgment and I'll just write it
> off as a terminology issue.
No. It is a technical design issue no matter what
terms you use.
The terms may confuse our communication but their
is a key point hidden underneath them.
> To me, Switch and Bridge are synonymous with
> Switches simply having more ports (multi-port-bridge).
You have been misinformed. They are distinct device
type, possibly with some overlapping features.
Switches are not even always based on bridges, but may
be switch-routers (layer 3) or some hybrid of a bridge
and router switch.
If you wish to fully understand you need to start with
CLASSICAL (simple) bridges and routers, learn their
KEY points and then apply this knowledge to understanding
modern hybrid/complex switches.
> I consider a
> broadcast domain to be a "logical" thing probably more so than physical.
It is a physical thing first and foremost.
It defined as the domain (area) in which broadcasts will propagate.
A bridge propagates broadcasts; a router does not. (by default)
> You can have two physcial segments connected with a Switch (aka Bridge)
Yes - when you start they are two SEPARATE broadcast
domains.
You connect them with a Bridge (doesn't matter if the bridge
is also a switch or not -- the key point is that it is BRIDGING,
not routing.)
Now, you have one new Broadcast domain since a bridge
propagates broadcasts.
Much like tying two strings together to get on (longer) string.
> and
> would end up with two physical segments that make up a single broadcast
> domain,...
Right. Due to the Bridging (of the switch in this case.)
> after all, it is the router that creates the broadcast domain,
No. Routers generally DO not join broadcast domains like
bridges do.
> not the physical wiring.
No, the physical wiring sets up the 'units' of the broadcast
domain and any bridges may join multiple physical segments
into a larger broadcast domain.
Do NOT hook a bridge TWICE to the same broadcast domain.
This is not the same as saying you hook a bridge to two
broadcast domains to CONVERT them into one broadcast
domain.
Do the following though experiment: Take a pair of bridges
and hook them to the same physical segment then to each other
on another segment...
What happens when a broadcast occurs on one of the segments?
What does each bridge do with broadcasts?
Does the other bridge 'see' the propagation to the other shared
segment? What does it do with that?
(And the first bridge, what does it do when it hears the other
bridge propagate the broadcast?)
-- Herb Martin > > -- > > Phillip Windell [MCP, MVP, CCNA] > www.wandtv.com > >
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