ip subnet-zero and the use of the broadcast subnet and subnet 0

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Mar 25th, 2008
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Hi there, just a quick question really - if for instance the ip subnet-zero command has been applied to a router can the subnet 0 or broadcast subnet be used with an internetwork? i.e lets say on a point-to-point serial link or a LAN segment?



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Jon Marshall Tue, 03/25/2008 - 05:45
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Hi Garry

Yes you can use both the subnet 0 and all ones subnet with "ip subnet-zero". Note that after IOS 12.0 the default is ip subnet-zero.

See attached link for more details.




grichardson661 Tue, 03/25/2008 - 05:53
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This is what i was looking for! The reason i ask is because of some questions on the Boson CCENT exam which try and catch you out on subnetting questions.


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