RFC 950 was the original subnetting rule that did not
allow the use of subnet zero. The new RFC 1812 does
allow the use of subnet zero. This assumes that you are
using a routing protocol that is aware of the difference
between 131.107.0.0/16 and 131.107.0.0/17.
Yes it is. The 172.16.4.255 ip address would be the 172.16.4.252 subnet
broadcast address though.
- Original Message -
From: Jack <[EMAIL PROTECTED]>
Newsgroups: groupstudy.cisco
To: <[EMAIL PROTECTED]>
Sent: Thursday, January 25, 2001 6:41 PM
Subject: Re: Ip addressing que
Ok, so subnet zero is not usable, I understand that.
Is the last subnet usable even though it contains the 255 portion of the
address?
>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
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 a
> >
> > > > 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 no
ch 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 i
e, 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 t
ess 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
; 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]&g
ibbs <[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 networ
>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.
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. O
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