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In the previous video, we already calculate
the best prefix we can use for 12 PC,

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and we also already determine which IP we will
use, which is 172.16.10.0,

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and the prefix is /28.

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Now in this video, we are going to calculate
the Total IP and Subnetmask

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But before continue watching this video,

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make sure that you already try to calculate by your self.

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If don’t, pause the video now, and try to
calculate by your self first.

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But if you have done, let’s continue to
this video.

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Okay now let’s calculate the Total IP.

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The formula is 2 to the power of 32 minus
by the prefix, in this case, the prefix is /28

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32 minus 28 is 4, so 2 to the power of
4.

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The result is 16.

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So the total IP for prefix /28 is 16.

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Next we are going to calculate subnetmask.

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The formula is 256 minus by total IP.

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In this case the total IP is 16, so 256 minus
16, the result is 240.

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Remember that this number will replace the
last number in the subnetmask.

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So the subnetmask for prefix /28 is 255.255.255.240.

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Okay now we have successfully calculate the
total IP and the subnetmak.

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In the next video we are going to calculate
Network IP and Broadcast IP.

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Thankyou for watching and see you on the next
video!