N10-008 Exam Dumps | To find the best subnet mask that meets the requirement of six usable IP addresses, we need to calculate

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Question 94/334

To find the best subnet mask that meets the requirement of six usable IP addresses, we need to calculate the number of host bits and the number of host addresses for each option. The number of host bits is the number of
0s in the binary representation of the subnet mask, and the number of host addresses is 2^host bits - 2 (the -2 is to exclude the network address and the broadcast address). The option that has the smallest number of host addresses that is greater than or equal to six is the best choice. Here are the calculations for each option:

A. 255.255.255.128
Binary: 11111111.11111111.11111111.10000000
Host bits: 7
Host addresses: 2^7 - 2 = 126 - 2 = 124
This option has too many host addresses for the requirement.

B. 255.255.255.192
Binary: 11111111.11111111.11111111.11000000
Host bits: 6
Host addresses: 2^6 - 2 = 64 - 2 = 62
This option also has too many host addresses for the requirement.

C. 255.255.255.224
Binary: 11111111.11111111.11111111.11100000
Host bits: 5
Host addresses: 2^5 - 2 = 32 - 2 = 30
This option has the smallest number of host addresses that is greater than or equal to six, so this is the best choice.

D. 255.255.255.240
Binary: 11111111.11111111.11111111.11110000
Host bits: 4
Host addresses: 2^4 - 2 = 16 - 2 = 14
This option has fewer host addresses than the requirement, so this is not a valid choice.

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