The way I've always read it, with both Microsoft and Cisco texts, is that
even though subnet zero is supported by nearly everything these days, it's
not recommended as not everything does support it (not that I've ever heard
of something not, but perhaps an old UNIX host or something). I think for
any test I'd go with the "book" answer and ditch the 0s & 1s subnets.
--
Jason Roysdon, CCNP+Security/CCDP, MCSE, CNA, Network+, A+
List email: [EMAIL PROTECTED]
Homepage: http://jason.artoo.net/
Cisco resources: http://r2cisco.artoo.net/
""Bob Vance"" <[EMAIL PROTECTED]> wrote in message
001901c084ed$68539e80$[EMAIL PROTECTED]">news:001901c084ed$68539e80$[EMAIL PROTECTED]...
> Sorry for the lame question, but I gotta know :|
>
> We know that subnet -1 (all ones) is valid to config in IOS and that 0
> is OK with
>
> ip subnet-zero.
>
> For purposes of CCNA 2, do we assume that subnet 0 and -1 are valid,
> vs. CCNA 1 (where they were not) for questions like,
> "How many subnets can we have with this mask?
> "
> ?
> Does the test make it clear in preliminary text?
>
> The archives seem to have conflicting answers.
>
> The Cisco Press ICND book (McQuerry, 1-57870-111-2) doesn't address the
> issue head on, but simply shows tables with (2^(n-1))-2 subnets.
>
> The Cisco Press 640-507 Cert Guide (Odom, 0-7357-0971-8) clearly says
> that 2^(n-1) is correct and yet points out that 0 is only valid with
> "ip subnet-zero" !
>
> Does anyone know the *definitive* answer for CCNA 2.0 ?
>
>
> -------------------------------------------------
> Tks | <mailto:[EMAIL PROTECTED]>
> BV | <mailto:[EMAIL PROTECTED]>
> Sr. Technical Consultant, SBM, A Gates/Arrow Co.
> Vox 770-623-3430 11455 Lakefield Dr.
> Fax 770-623-3429 Duluth, GA 30097-1511
> =================================================
>
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>
>
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