Subnetting

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Subject

Author

Date

Subnetting

cooldude

07-03-2006

Re: Subnetting

cooldude

07-03-2006

new guy

Steve

Posted by cooldude on July 3, 2006, 4:40 am

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Hello

I am trying to learn subnetting and studied the book. The examples given are
to subnet an address where the subnet part of the address is less than 8
bits.

i.e. to subet a class A address with a class B subnet mask or Class B
address with a class C subnet mask. I am finding it difficult to understand
how to subnet a class A address with a class subnet mask.

Can anyone suggest any online article or ideas please?

Posted by cooldude on July 3, 2006, 5:05 am

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Sorry, the question should be

"How to subnet a Class A address with a Class C mask, or in other words.,
how to subnet when the subnet part is more than 8 bits.

> Hello

> I am trying to learn subnetting and studied the book. The examples given

> are to subnet an address where the subnet part of the address is less than

> 8 bits.

> i.e. to subet a class A address with a class B subnet mask or Class B

> address with a class C subnet mask. I am finding it difficult to

> understand how to subnet a class A address with a class subnet mask.

> Can anyone suggest any online article or ideas please?

Posted by new guy on July 3, 2006, 11:25 am

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> Sorry, the question should be

> "How to subnet a Class A address with a Class C mask, or in other words.,

> how to subnet when the subnet part is more than 8 bits.

You mean something like:10.0.0.0/24 Well, the subnet portion is the 2nd and
3rd octet.
There will be 2^16(bits) - 2 = 655342 subnets and 2^8(bits) - 2 = 254 hosts
per subnet.

Here is the math you need for subnetting:
To find 2^16, all you have to do is multiply 2^8 (256) x 2^8 (256) = 65536
(easy number to memorize). Also memorize 2^10=1024. If you have 13 bits for
the subnet, then multiply 1024 x 2 three times. In our case, if you multiply
1024x2 six times, the result will be 65536!

new guy :)

Posted by Steve on July 3, 2006, 7:45 am

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http://www.networking-forum.com/subnetting.html

Hope this helps. If not, post your specific questions on the forum.

Regards,
Steve

> Hello

> I am trying to learn subnetting and studied the book. The examples given

> are to subnet an address where the subnet part of the address is less than

> 8 bits.

> i.e. to subet a class A address with a class B subnet mask or Class B

> address with a class C subnet mask. I am finding it difficult to

> understand how to subnet a class A address with a class subnet mask.

> Can anyone suggest any online article or ideas please?

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other useful resources:
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Telecommunications Industry Association
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International Telecommunication Union

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