Information Technology Reference
In-Depth Information
fIgure 8.10
An example of a smaller subnet address
Acme, Inc.
Network address:
132.8 (Class B; net.net.host.host)
Example IP address:
Decimal:
1000 0100.
0000 1000.
0001 0010.
0011 1100
132
.
8
.
18
.
60
Subnet Mask Code
1s = Positions representing network or subnet addresses
0s = Positions representing the host address
Subnet mask:
Binary:
Decimal:
(The decimal 240 is equal to the binary 1111 0000.)
1111 1111.
1111 1111.
1111 0000.
00000000
255
.
255
.
240
.
0
Positions relating to the subnet address
1111 1111.
1111 1111.
1111 0000.
00000000
Subnet mask:
IP address of a Acme machine:
(Decimal: 132.8.18.60)
1000 0100.
0000 1000.
0001 0010.
00111100
Bits relating to the subnet address
Binary-to-Decimal Conversions for Subnet Address
11110000
Subnet mask positions:
Position/value:
Third byte of IP address:
(continue)
1286432 6 8421
00010010
0 + 16 = 16
16
Decimal equivalent:
Subnet address for this IP address:
An Easier Way to Apply Subnetting
Now that you have the basics of how to subnet down, you'll learn an easier way. If you
have learned a different way and it works for you, stick with it. It does not matter
how you get to the finish line, just as long as you get there. But if you are new to subnetting,
Figure 8.11 will make it easier for you.
This chart may look intimidating, but it's really simple to use once you have done it a
few times.
Remember that, on this chart, 1s equal subnets, and 0s equal hosts. If you
get this confused, you will get wrong answers in the following exercises.
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