I don't think so. All 1s subnets is always the broadcast address for all
subnets and all 0's is only possible with "ip subnet-zero". Classless or
classfull routng has to do with VLSM...
Ednilson Rosa
Analista de Suporte Técnico
CPM S/A - Filial Salvador - BA
----- Original Message -----
From: "gavin welch"
To: "Ednilson Rosa"
Sent: Thursday, March 02, 2000 8:47 AM
Subject: Re: subnets [1:2277]
it is my understanding with classless routing like RIP v2 that in fact you
can use the all1s subnet and the all 0 subnet..anyonw ant to clarify?
----- Original Message -----
From:
To:
Sent: Thursday, March 01, 2001 7:29 PM
Subject: Re: subnets [1:2277]
> Well, it?s a class A address with 5 bits of subnet (13 - 8 from class A
> standard mask). By using the (2^n)-2 rule we have: 2^5 = 32 - 2 = 30.
>
> Don?t forget you can?t assign all 0?s or all 1?s for both the host and the
> subnet portion of the address. That?s why you subtract 2 form the 32.
>
> But there?s a trick here: in fact you could have 31 subnets in a Cisco
> router if you used the "ip subnet-zero" command, which enables you to use
> the zero subnet, although this is not encouraged by Cisco.
>
> So, possible answers for this question would be 30 (most correct) and 31,
> but never 32...
>
> ER
>
> ----- Original Message -----
> From: "binoy sebastian"
> To:
> Sent: Friday, March 02, 2001 12:02 AM
> Subject: subnets [1:2277]
>
>
> This question may find silly for some of you.. Silly
> though, I find two different answers in two different
> books:
>
> how many subnets the following ipaddress has:
>
> 10.8.2.4/13
>
> One book says 32 another says 30
>
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