From: Danny Cox (dandermanuk@gmail.com)
Date: Tue Nov 14 2006 - 20:22:34 ART
It does seem to be a common point of confusion.
A class A address is one which has the first bit of the highest byte
in the address set to zero. That is, it can be from 00000000 to
01111111 or in decimal 0 to 127. A class B address has the first two
bits to 10 and a class C address is set to 110. A class D address
(multicast) is set to 11110 and an E (experimental) is set to 1111
This means that:
A - 0 - 127
B - 128 - 191
C - 192 - 223
D - 224 - 239
E - 240 - 255
This, and this alone, is what defines the address of a network.
Nothing to do with the netmask at all and that is what confuses
people. When you hear folk say I'll subnet this class B into lots of
class Cs, they're misusing the terminology.
Danny
On 14/11/06, dampened <cheechew@hotmail.com> wrote:
> I still couldn't figure out what is major network boundary exactly is with
> your example.
> Is there any thing to do with the netmask?
>
>
>
>
> ----- Original Message -----
> From: "Heiko Liedtke" <heiko.liedtke@gmx.net>
> To: "dampened" <cheechew@hotmail.com>
> Cc: "Cisco certification" <ccielab@groupstudy.com>
> Sent: Tuesday, November 14, 2006 12:23 AM
> Subject: Re: major network and classful
>
>
> >I hope I understand it correct...
> >
> > auto-summary will only work when the routing information
> > passes a major network boundary.
> >
> > In the following example there is NO major network boundary
> > and R2 would not perform auto-summary (when running RIP or EIGRP)
> >
> > R1----- 10.10.2.4/30----R2------10.2.2.0/30------R3
> >
> > In the next example there is a major network boundary and R2 would
> > perform auto summarization to the classfull network 10.0.0.0/8
> >
> >
> > R1-----10.10.2.4/30----R2------192.168.2.0/30-----R3
> >
> >
> > Heiko
> >
> >
> >
> > dampened schrieb:
> >
> >> I am getting more and more confusing of these term.
> >>
> >> Should everyone agree with me that classful net is thus network with /8
> >> class A, /16 class B and /24 class C. This is what auto-summary will be
> >> summarized to.
> >>
> >> What is the defination of major network boundary?
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