What's the point?
Greenmet29
Member Posts: 240
in CCNA & CCENT
of the "no ip subnet zero" command? I mean, I understand what it does, but why would they make an entire subnet unusable? Maybe it's something i'm just missing, after all, it has been a few months since I have studied... 
Comments
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okplaya
Member Posts: 199
From Cisco,
"Using subnet zero for addressing was discouraged because of the confusion inherent in having a network and a subnet with indistinguishable addresses" -
Greenmet29
Member Posts: 240
Interesting...
If anyone else is looking at this asking the same question, this link expands on this answer.
Subnet Zero and the All-Ones Subnet [IP Addressing Services] - Cisco Systems -
Forsaken_GA
Member Posts: 4,024
I suppose it's there in the off chance you have to integrate with legacy equipment. IOS has defaulted to using subnet zero for a very long time. And it's not that they have a no ip subnet zero command, it's that they have an ip subnet zero command
Unless I'm seriously mistaken, every configuration command can be negated by putting no in front of it. basically, when you set the command, it flips a configuration bit to 1, when you repeat the no form, it flips it to 0. It'd be really stupid to have a light you could only turn on.