But the third octet, would be 00000100, which is contained within the subnet
portion of the address, so how can this be subnet zero.
I agree that 192.16.4.0 with 255.255.255.252 would be a subnet zero, because
the fourth octet would be 00000000 - 00000011 and only the 6 MSB's count.
If I'm being thick you're going to have to ram it down my neck.
I would like to make my excuses now, it's getting late in U.K.
Gareth
""Neil Schneider"" <[EMAIL PROTECTED]> wrote in message
94qe36$vpl$[EMAIL PROTECTED]">news:94qe36$vpl$[EMAIL PROTECTED]...
> 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
> > > > >
> > > > >
> > > > >_________________________________________________________________
> > > > >Get your FREE download of MSN Explorer at http://explorer.msn.com
> > > > >
> > > > >_________________________________
> > > > >FAQ, list archives, and subscription info:
> > > >http://www.groupstudy.com/list/cisco.html
> > > > >Report misconduct and Nondisclosure violations to
> [EMAIL PROTECTED]
> > > >
> > > >------------------------------------------------------------
> > > >Have a Good Day!!
> > > >Jennifer Cribbs
> > > >[EMAIL PROTECTED]
> > > >
> > > >_________________________________
> > > >FAQ, list archives, and subscription info:
> > > >http://www.groupstudy.com/list/cisco.html
> > > >Report misconduct and Nondisclosure violations to
[EMAIL PROTECTED]
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > >
> > > _________________________________
> > > FAQ, list archives, and subscription info:
> > http://www.groupstudy.com/list/cisco.html
> > > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> > >
> >
> >
> > _________________________________
> > FAQ, list archives, and subscription info:
> http://www.groupstudy.com/list/cisco.html
> > Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
> >
>
>
> _________________________________
> FAQ, list archives, and subscription info:
http://www.groupstudy.com/list/cisco.html
> Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
>
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
