Which of the following is the broadcast address for the subnet in which IP address 200.10.5.68/28 resides?
A) 200.10.5.31
B) 200.10.5.47
C) 200.10.5.79
D) 200.10.5.95
C
Explanation: C) The correct answer is 200.10.5.79 because, first, the resident subnet (the subnet ID of the subnet in which the address resides) must be numerically larger than the IP address, which rules out two of the answers. The mask converts to 255.255.255.240. As such, you can copy the first three octets of the IP address because of their value, 255. 55. For the fourth octet, the subnet ID value must be a multiple of 16 (magic number) because 256 - 240 (mask) = 16. Those multiples include 48 and 64, and the correct choice is the multiple closest to the IP address value in that octet (68 ) without going over. So, the correct subnet ID is 200.10.5.64, which makes its broadcast address 200.10.5.79.
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