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TOPIC: subnet bits - all 1's

subnet bits - all 1's 11 years 10 months ago #6647

  • trmmjpz
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Why do they object to all zeros/all ones in the subnet bits?

Hi,
Say i have a subnet mask of
255.255.192.0 and my class B n/w addr is
130.120.0.0

My subnets are
130.120.0.0
130.120.64.0
130.120.128.0
130.120.192.0

why is it that 130.120.0.0
and 130.120.192.0 are forbidden unless you specifically use the ip subnet-zero cmd?

Thanks,
- K
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Subnet Zero 11 years 10 months ago #6670

  • TheBishop
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Have a look at the post "IP Subnet Zero - Valid in CCNA Exam" in this forum
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