At the CCNA level we're still teaching 2^n-2, but we also clarify the difference
between
the "classroom" and the "real world."
Tom Lisa, Instructor, CCNA, CCAI
Community College of Southern Nevada
Cisco Regional Networking Academy
Bob Vance wrote:
> 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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