Which of the following option is not correct regarding IP address 192.40.19.132 with subnet mask – 255.255.255.240 ?
(A) Network Address: 192.40.19.128
(B) First host of given subnet is 192.40.19.144
(C) Last host of given subnet is 192.40.19.254
(D) DBA of the given subnet is 192.40.19.255


Answer: (B)

Explanation: Determining Network and Host ID of an IPv4 address:

IP Address:    192.40.19.132
Network Address:    192.40.19.128
Usable Host IP Range:    192.40.19.129 - 192.40.19.142
Broadcast Address:    192.40.19.143
Total Number of Hosts:    16
Number of Usable Hosts:    14
Subnet Mask:    255.255.255.240 

Therefore, first host of given subnet is 192.40.19.129.

So, option (B) is false.

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