As the network engineer, you are provided with the following IP address and subnet mask 172.16.10.22 255.255.255.240. What is the valid host range for this IP address?
A) 172.16.10.20 through 172.16.10.22
B) 172.16.10.1 through 172.16.10.255
C) 172.16.10.16 through 172.16.10.23
D) 172.16.10.17 through 172.16.10.31
E) 172.16.10.17 through 172.16.10.30

Question

Quizplus · Accepted Answer

E) The correct answer is 172.16.10.17 through 172.16.10.30 because, with the given mask of 255.255.255.240 (/28), subtracting the last value from 256 equals 16 (magic number). The multiples of 16 include the values 16, 32, 48, and so on. Using the last value of the IP address given, compare it to your list and take the lowest value; the subnet would be 172.16.10.16.

As the Network Engineer, You Are Provided with the Following