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martin
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 Posted: Sat Aug 09, 2003 8:21 am Post subject: Rephrase: How to calculate the number of available subnets |
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martin
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| Posted: Sat Aug 09, 2003 8:21 am Post subject: Rephrase: How to calculate the number of available subnets |
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That makes more sense. :)
"martin" <bajelisNO@SPAM4MEozemail.com.au> wrote in message
news:3f346839$0$23599$5a62ac22@freenews.iinet.net.au...
| Quote: | "martin" <bajelisNO@SPAM4MEozemail.com.au> wrote in message
news:3f345f41$0$23595$5a62ac22@freenews.iinet.net.au...
Wendell Odom (In CCNA Certification guide 640-507) states:
" The number of subnets per network is defined by this formula:
2 ^ number of subnet bits
In some documents the number of subnets is shown as 2 less than 2^
number
of
subnet bits, implying two reserved cases. These two cases are no longer
reserverd, however and can be used."
Tod Lammle (In CCNA Study Guide 3rd Edition 640-607) states:
" How many subnets ? 2 ^x - 2 = number of subnets. x is the number of
masked
bits. "
So my quesiton is:
Which is correct FOR THE PURPOSES OF THE EXAM ???
Thanks,
Martin.
I wasn't concentrating:
The question is how to calculate the number of SUBNETS, not HOSTS.
Sorry... the question is correct, but my subject is wrong :)
Cheers,
Martin
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Steve Largess
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| Posted: Sun Aug 10, 2003 3:07 am Post subject: Re: Rephrase: How to calculate the number of available subn |
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The OLD CCNA taught (2^n)-2 assuming you did not use subnet zero.
The new CCNA (based on ICND 2.0) assumes 2^n.
Found a handy subnet calc (free) that does both:
www.boson.com/eula.htm
On Sat, 9 Aug 2003 13:21:37 +1000, "martin"
<bajelisNO@SPAM4MEozemail.com.au> wrote:
| Quote: |
That makes more sense. :)
"martin" <bajelisNO@SPAM4MEozemail.com.au> wrote in message
news:3f346839$0$23599$5a62ac22@freenews.iinet.net.au...
"martin" <bajelisNO@SPAM4MEozemail.com.au> wrote in message
news:3f345f41$0$23595$5a62ac22@freenews.iinet.net.au...
Wendell Odom (In CCNA Certification guide 640-507) states:
" The number of subnets per network is defined by this formula:
2 ^ number of subnet bits
In some documents the number of subnets is shown as 2 less than 2^
number
of
subnet bits, implying two reserved cases. These two cases are no longer
reserverd, however and can be used."
Tod Lammle (In CCNA Study Guide 3rd Edition 640-607) states:
" How many subnets ? 2 ^x - 2 = number of subnets. x is the number of
masked
bits. "
So my quesiton is:
Which is correct FOR THE PURPOSES OF THE EXAM ???
Thanks,
Martin.
I wasn't concentrating:
The question is how to calculate the number of SUBNETS, not HOSTS.
Sorry... the question is correct, but my subject is wrong :)
Cheers,
Martin
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