Q18
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) #ip classlessB.
Router (config) #no ip classfulC.
Router (config) #ip unnumberedD.Answer
Router (config) #ip subnet-zeroAnswer: Option D
Solution
Answer: Option D
Solution:
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.