Which of the following is the subnet broadcast address for the subnet in which IP address 172.31.77.201/27 resides?
- 172.31.201.255
- 172.31.255.255
- 172.31.77.223
- 172.31.77.207
Explanation: The resident subnet ID in this case is 172.31.77.192. You can find the subnet broadcast address based on the subnet ID and mask using several methods. Following the decimal process in the book, the mask converts to 255.255.255.224, making the interesting octet be octet 4, with magic number 256 – 224 = 32. For the three octets where the mask = 255, copy the subnet ID (172.31.77). For the interesting octet, take the subnet ID value (192), add magic (32), and subtract 1, for 223. That makes the subnet broadcast address 172.31.77.223.
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