Divide
3
Make Host=0
172 . 16 . 0 . 0
172 . 16 . 0 . 1
4
Add 1
172 . 16 . 8 . 9
5
Make Host=255
172 . 16 . 255 . 255
6
Subtract 1
172 . 16 . 255 . 254
+1
-1
Figure 12-5
Example Deriving the Network ID and Other Values from 172.16.8.9
Figure 12-5 shows the identification of the class as Class B (Step 1) and the number of net-
work/host octets as 2 and 2, respectively. So, to find the network ID at Step 3, the figure
copies only the first two octets, setting the last two (host) octets to 0. Similarly, Step 5 shows
the same action, but with the last two (host) octets being set to 255.
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