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Convert to Binary?
First, we convert all of the 172.16.0.0 addresses above to their Binary form.
10101100.00010000
The Binary translation of these networks are:
172.16.1.0 ? 10101100.00010000.00000001.00000000
172.16.2.0 ? 10101100.00010000.00000010.00000000
172.16.3.0 ? 10101100.00010000.00000011.00000000
Lets Summarize but ?we need to locate the ?Summary Border.?? To summarize these network addresses, the Summary Border needs to be located. This will be the dividing line between the ?same bits?? and ?different ? bits in the address.? The “same” bits are shown in Orange color??below:
172.16.1.0 ? 10101100.00010000.00000001.00000000
172.16.2.0 ? 10101100.00010000.00000010.00000000
172.16.3.0 ? 10101100.00010000.00000011.00000000
To summarize these addresses we count the number of the ?same? bits to the left of the Summary Border.? In this case, from the farthest left bit to the summary border there are 22 bits.? Therefore, we can summarize these three network addresses as 172.16.0.0 /22.