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Posted by Steve C on February 6, 2005, 11:45 pm
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In a class C subnet of 255.255.255.240 are not host xxx.xxx.xxx.001 to
xxx.xxx.xxx.15 invalid? Arnt the first eligable hosts xxx.xxx.xxx.017/28 to
xxx.xxx.xxx.030/28?
thanks
Steve C.
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Posted by Fred Atkinson on February 7, 2005, 12:48 am
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That depends upon whether you are running classful or
classless routing. If running classless, it also depends upon whether
or not you have the 'ip subnet-zero' option enabled. If running
classful, not.
Also, with that subnet mask, .15 would be a broadcast address
and cannot be used for a host address.
Fred
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Posted by Todd Lammle on February 7, 2005, 7:25 am
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Steve, great question. If you are studying for the Cisco CCNA exam,
then yes, they are now valid. Pre- 2005 exams would have considered
those invalid. As the other posts mention, this is the ip subnet-zero
command, which is on by default starting in IOS version 12.1.
Cheers!
Todd Lammle
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