yes 172.16.4.0 thru 172.16.4.3 would be subnet zero.
Neil Schneider
""Gareth Hinton"" <[EMAIL PROTECTED]> wrote in message
94qd3r$s2r$[EMAIL PROTECTED]">news:94qd3r$s2r$[EMAIL PROTECTED]...
> I've read it five times and still can't see a subnet zero in the example.
> 172.16.x.x Class B address with a 255.255.255.252 subnet mask.
> Wouldn't subnet zero be down at 172.16.0.0 with 172.16.0.4 being the first
> 'non-subnet zero' address.
> 172.16.4.0 wouldn't be subnet zero would it?
>
> Gareth
>
> ""Frank Wells"" <[EMAIL PROTECTED]> wrote in message
> [EMAIL PROTECTED]">news:[EMAIL PROTECTED]...
> > Hey Jen,
> > Your understanding of subnetting is a little off and your teaching is
thus
> > tainted. Here is a how subnetting and subnet zero work:
> >
> > Take a IP address for example: 172. 16. 4. 0
> > Add an easy subnet mask to play with: 255.255.255.252
> >
> > What subnets to we get from this combo?...
> > First subnet= 172.16.4.4
> > Second subnet= 172.16.4.8
> > Third subnet= 172.16.4.12
> > ...
> > Last subnet= 172.16.4.252
> >
> >
> > Lets examine one of the subnets: 172.16.4.4
> > The IP address space this subnet consumes is 172.16.4.4 through
172.16.4.7
> > The first and last IP addresses in the subnet range are the network
> address
> > and subnet broadcast address respectively, and neither the first or last
> > address can be used for host addressing, as is
> > well known. This leaves two remaining addresses available for hosts on
> that
> > subnet:
> >
> > 172.16.4.5 and 172.16.4.6
> >
> > Subnet zero is that address space which is not taken up by the subnets.
> In
> > our example this would be 172.16.4.1;172.16.4.2;172.16.4.3
> > Routers do not use subnet zero for anything unless instructed to do so
and
> > if this is the case, they will merely recognize it and route it. The
> > broadcast address in a subnet does not see the entire network, it
> broadcasts
> > only to its entire sub-network. Referring to our example once more,
this
> > would be the address 172.16.4.7 and only the two host addresses on the
> > subnet would hear a broadcast from it.
> >
> > Hope this clarifies things.
> >
> >
> >
> > >From: Jennifer Cribbs <[EMAIL PROTECTED]>
> > >Reply-To: Jennifer Cribbs <[EMAIL PROTECTED]>
> > >To: [EMAIL PROTECTED]
> > >Subject: RE: Ip addressing question
> > >Date: Thu, 25 Jan 2001 10:38:38 -0500
> > >
> > >Subnet zero is the network address that the routers uses for routing to
> the
> > >network and the broadcast address sends a broadcast to the entire
network
> > >everytime it is used, which means it goes to all subnets. Therefore,
> these
> > >are not used as host addresses. They encompass the whole network.
> Others
> > >can
> > >probably add to this.
> > >
> > >Jennifer Cribbs
> > >
> > >
> > >===== Original Message From "Fred Danson" <[EMAIL PROTECTED]>
=====
> > > > Could anyone explain to me why Subnet zero and the last subnet
are
> > >not
> > > >normally used?? I see why 2 host addresses are reserved in every
subnet
> > > >(network address and broadcast address), but I never understood why 2
> > > >networks are not used. What is the difference between these networks
> and
> > >the
> > > >networks in between?
> > > >
> > > >Thanks in advance,
> > > >
> > > >Freddy
> > > >
> > > >
> > > >_________________________________________________________________
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> > >------------------------------------------------------------
> > >Have a Good Day!!
> > >Jennifer Cribbs
> > >[EMAIL PROTECTED]
> > >
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