You are given the IP address 200.1.1.130 and the mask 255.255.255.224. Identify the subnet number
A) 200.1.1.96
B) 200.1.1.128
C) 200.1.1.160
D) 200.1.1.192
B
Explanation: B) The correct answer is 200.1.1.128 because, first, the resident subnet (the subnet ID of the subnet in which the address resides) must be numerically smaller than the IP address, which rules out two of the answers. 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 32 (magic number) because 256 - 224 (mask) = 32. Those multiples include 96 and 128, and the correct choice is the multiple closest to the IP address value in that octet (130 ) without going over. So, the correct subnet ID is 200.1.1.128.28.
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