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If the subnet mask is 255.255.255.224, which of the following addresses CANNOT be assigned to network hosts?

 A. 15.234.118.63

B. 92.11.178.93

C. 134.178.18.56  

D. 192.168.16.87 
 

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A is directed broadcast address not a host address . A is answer.

3
3
How it became a broadcast address? Please explain
–1
–1
It is the first subnet  DBA.
0
0

1 Answer

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5 votes
Best answer

NETMASK = 255.255.255.224

224 = 11100000

=> we have 5 host bits.

A) 63 = 00111111

B) 93 = 01011101

C) 56 = 00111000

D) 87 = 01010111

In A all 5 host bits are 1 => It is the directed broadcast address in 15.234.118.32 subnet.

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