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Home > Archive > alt.certification.cisco > June 2003 > Subneting question
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| Author |
Subneting question
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| David Thompson 2003-05-27, 1:24 pm |
| What is the easiest way to determine the subnet of any class of ip address?
I am reading the CCNA 2.0 book by Robert E. Larson and he doesn't fully
explain the answers that he presents in the book.
Is the formula (mask - closest octect= 2x=increment, which lets you
dertermine the subnet)?
I am just trying to get a firm grasp of subnetting.
Thank you for your time,
David Thompson
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| jason892 2003-05-27, 2:56 pm |
| Are you looking for an easy way to determine the subnet mask, or the subnet address for a given ip? | |
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| The lsat bit of the mask determines the increment if that's what your
asking.
A mask of 255.255.240.0 in binary is
11111111 11111111 11110000 00000000
The 4th bit in the 3rd octet is on the 16 bit.(128,64,32,16)
So the subnets would be increments of 16.
X.X.0.0 (if you're using subnet zero)
X.X.16.0
X.X.32.0
X.X.64.0 etc
I hope that helps.
--
tmack
Before you criticise someone, you should walk a mile in their shoes.
That way, when you criticise them, you'll be a mile away.
And you'll have their shoes.
"David Thompson" <moviestar_25_david@cox.net> wrote in message
news:NuNAa.157719$3n5.43563@news2.central.cox.net...
> What is the easiest way to determine the subnet of any class of ip
address?
>
> I am reading the CCNA 2.0 book by Robert E. Larson and he doesn't fully
> explain the answers that he presents in the book.
>
> Is the formula (mask - closest octect= 2x=increment, which lets you
> dertermine the subnet)?
>
> I am just trying to get a firm grasp of subnetting.
>
> Thank you for your time,
>
> David Thompson
>
>
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| Dready 2003-06-26, 7:24 am |
| write the IP address down in binary
and divide the subnet mask in binary from it.
the part you have left is the subnet
On Tue, 27 May 2003 17:45:17 GMT, "David Thompson"
<moviestar_25_david@cox.net> wrote:
>What is the easiest way to determine the subnet of any class of ip address?
>
>I am reading the CCNA 2.0 book by Robert E. Larson and he doesn't fully
>explain the answers that he presents in the book.
>
>Is the formula (mask - closest octect= 2x=increment, which lets you
>dertermine the subnet)?
>
>I am just trying to get a firm grasp of subnetting.
>
>Thank you for your time,
>
>David Thompson
>
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