I was practicing on some questions in preparation for the ICND1 and the question is about wildcard mask and ranges.
Which Address and wildcard mask combination will match all IPv4 addresses in the networks 172.30.0.0/24 through 172.30.15.0/24
A. 172.30.0.0 0.0.1.255
B. 172.30.0.0 0.0.31.255
C. 172.30.0.0 0.0.15.255
D. 172.30.0.0 0.0.3.255
E. 172.30.0.0 0.0.63.255
F. 172.30.0.0 0.0.7.255
The answer is C something i found by running the question on an online subnetting calculator. Came out with the subnet mask of 255.255.240.0
Now i do understand that to get the wild card mask you do 255.255.255.255 - 255.255.240.0 and that is how you come up with 0.0.15.255
Now my question is from the question how did you come up with that answer.
Thanks in advance.
Which Address and wildcard mask combination will match all IPv4 addresses in the networks 172.30.0.0/24 through 172.30.15.0/24
A. 172.30.0.0 0.0.1.255
B. 172.30.0.0 0.0.31.255
C. 172.30.0.0 0.0.15.255
D. 172.30.0.0 0.0.3.255
E. 172.30.0.0 0.0.63.255
F. 172.30.0.0 0.0.7.255
The answer is C something i found by running the question on an online subnetting calculator. Came out with the subnet mask of 255.255.240.0
Now i do understand that to get the wild card mask you do 255.255.255.255 - 255.255.240.0 and that is how you come up with 0.0.15.255
Now my question is from the question how did you come up with that answer.
Thanks in advance.