This was a fascinating topic that was previously discussed back in July of 1999. I
bookmarked it for reference, because I found the debate so interesting. You might
want to search the archives for the thread "Theoretical question".
To summarize the jist of the discussion, RFC 1812, declares discontiguous subnet
masks as illegal. You'll find the specifics in Section 10.2.2, "Address and Prefix
Initialization".
-- Leigh Anne
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Casey Fahey
> Sent: Saturday, September 02, 2000 7:48 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Subnet Question
>
>
> Golly, sorry to tell you this, but I think you are on the 'proverbial
> crack'... I would answer B on any Cisco, MS, Nortel or any other
> test you
> care to put in front of me...
>
> A subnet mask determines the place where the bits on the left
> (the network
> bits) are divided from the bits on the right (the host bits). If
> you had a
> subnet mask of 0.255.255.0 you would basicly be saying that the
> network you
> are on is the center 2 octets only, while the host bits are the first and
> last octet.
>
> I can't say that I have tried this on a private or a public
> network, but I
> cannot see this working. Either the equipment would keep you
> from setting
> this up, or the network would just not work. One of the central
> assumptions
> of TCP/IP is that the network MUST be on the right and the hosts
> MUST be on
> the left.
>
> That said, if you ever try this PLEASE let me know how it goes!
>
> HTH,
>
> Casey
>
> >From: "Aaron Moreau-Cook" <[EMAIL PROTECTED]>
> >Reply-To: "Aaron Moreau-Cook" <[EMAIL PROTECTED]>
> >To: <[EMAIL PROTECTED]>
> >Subject: Subnet Question
> >Date: Sat, 2 Sep 2000 17:47:43 -0700
> >
> >Question taken from the CCNA Exam Cram book by Walters, Rees, and Coe.
> >
> >A subnet mask can have a value of 0.255.255.0
> >
> >A) True
> >B) False
> >
> >The Cisco answer would dictate that it is false, and in all
> functionality
> >it
> >is true. Hypothetically though it could be true, I rememeber
> this discusion
> >a while ago, but I'm looking to see if I am smoking the proverbial crack.
> >
> >Thanks all!
> >
> >Aaron Moreau-Cook
> >Finally taking his CCNA test this coming Friday....
> >
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