That's a good question. Be careful cause with addressing errors sometimes
things works fine almost of the time but problemas may appear later...
----- Original Message -----
From: "Paulo Roque"
To:
Sent: Friday, March 02, 2001 1:00 PM
Subject: Re: subnets [1:2277]
Hi all,
What about a class C network with mask /26, how many networks?
Let´s say 192.168.1.0/26
Well, it´s a class C address with 2 bits of subnet (26 - 24 from class C
standard mask). By using the (2^n)-2 rule we have: 2^2 = 4 - 2 = 2 subnets.
The subnets are:
192.168.1.0/26 invalid
192.168.1.64/26 valid
192.168.1.128/26 valid
192.168.1.192/26 invalid
With "ip subnet-zero" I can use the invalid subnet 192.168.1.0/26. So I will
have 3 subnets. However, here I use all 4 subnets and they work very well.
What´s wrong?
Paulo Roque
"Ednilson Rosa" escreveu na mensagem
news:200103020329.WAA28325@xxxxxxxxxxxxxxxxx
> 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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