Subnetting

Q1: Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.255.224?

A Router(config)#no ip classful

B Router(config)#ip classless

C Router(config)#ip subnet-zero

D Router(config)#ip unnumbered

ANS:D - Router(config)#ip subnet-zero

A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.



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