The 192 comes from the admin. If you were the admin of a network, and maybe you
are, you would probably get a full class 'C' (255.255.255.0) from your ISP or
maybe ARIN. You would decide how you want to divide that network. If you
wanted to divide it into two parts you would extend your mask by one bit or
255.255.255.128. If you wanted to divide it into four parts you would exetend
it to 255.255.255.192. You supplied the .192. The 255.255.255.0 you get from
ARIN. You make the decision if you want to change it and how much. Lamle is
pulling the .192 out of the air and giving it to you for example purposes.
Earl Aboytes
Senior Technical Consultant
GTE Managed Solutions
Dick Silva wrote:
> Group --
>
> Some enlightenment is appreciated.
>
> The following two examples are directly from Todd Lammle's CCNA book, 2nd
> edition. Pages 140 and 141.
>
> 1st example:
>
> Given a network address of: 192.168.10.0
>
> Given a subnet mask: 255.255.255.192 <---- Where does this 192 come from?
>
> I understand that 192 = 11000000
> And I understand that there are 2 subnets and 62 hosts and how to calculate
> both of these values. I would just like to know where the 192 comes from
> and some
> explanation of its purpose.
>
> 2nd example:
>
> Given the same network address: 192.168.10.0
>
> Given the subnet mask: 255.255.255.224 <---- So where does the 224 come
> from?
>
> I understand that 224 = 11100000
> And that there are 6 subnets and 30 hosts. Again where does the value 224
> come from and its purpose.
>
> What determines the selection of these two, 192 and 224, values or any of
> the others that are plugged in. I am not talking about the 255 values.
> Those I understand,11111111.
>
> Constructive feedback would be genuinely appreciated.
>
> [EMAIL PROTECTED]
>
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