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subneT mask exerCIse 8.4
Class b, 1,500 hosts per subnet
This one is a bit harder. You have a Class B address, and you need 1,500 hosts per subnet.
Because you have a Class B address, you need to fill in the third octet of numbers. The
fourth octet contains eight 0s.
1.
Write down the following:
255.255.___.0
2.
Look at the Y column and find the first number that covers 1,500. (This should be 2,046.)
3.
Go across and find the power number. (This should be 11.)
4.
Remember, you already have eight 0s in the last octet. So, you need only three more.
Find the row with three 0s.
You should come up with an answer of 255.255.248.0. This actually breaks down to 11111111.
11111111.111110 0 0.0 0 0 0 0 0 0 0, and that 's how you got the 11 zeros .
subneT mask exerCIse 8.5
Class b, 3,500 hosts per subnet
You have a Class B address, and you need 3,500 hosts per subnet.
1.
Write down the following:
255.255.___.0
2.
Look at the Y column and find the first number that covers 3,500. (This should be 4,094.)
3.
Go across and find the power number. (This should be 12.)
4.
Remember, you already have eight 0s in the last octet, so you need only four more.
Count for four zeros from right to left.
You should come up with an answer of 255.255.240.0. Again, this actually breaks down to 111
11111.11111111.11110 0 0 0.0 0 0 0 0 0 0 0, and that 's how you got the 12 zeros .
If you get a question that gives you both the hosts and the subnets, always
figure out the larger number first. Then, depending on the mask you have
decided to use, make sure that the lower number is also correct with that
mask.
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