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Subnetting 1 2 3

In: Computers and Technology

Submitted By spiderd21
Words 1155
Pages 5
Subnetting 1 2 3
By Adam Chee W.S
Ever get stressed out because you know that there would be subnetting question(s) in the next exam you are taking and that these questions easily take up 10 to 20 minutes of your precious exam time? What if there is more than one question?
The process of converting the subnet to binary and decimal can drive the unfamiliar insane, not to mention the waste of precious time and brain power which can be utilized for other areas of exam preparation.
Let's take a look at a shortcut method that will cut down the time needed to answer these questions without the need for a calculator.
Subnet Basics:
This article assumes that you know how to perform subnetting in the traditional method but it is important to stress that there are only 3 classes of usable IP addresses which are
Class

Range

Subnet mask

Host bit

Subnet

Class A

(127 is reserved for loopback) 255.0.0.0

24

8

Class B

128 - 191

255.255.0.0

16

16

Class C

192 - 223

255.255.255.0

8

24

1 - 126

You must understand and remember this table well in order to master the shortcut.
Note: You must borrow at least 2 bits and must leave at least 2 bits

The 'Subnet Table'
1

2

3

4

5

6

7

8

Bit Value

128

64

32

16

8

4

2

1

Subnet Mask

128

192

224

240

248

252

254

255

0

2

6

14

30

62

126

254

Bits Borrowed (N)

Number of Subnets
((2^N)-2)

If using the (2^N) method as defined in RFC 1878, your table would look like this instead.
1

2

3

4

5

6

7

8

Bit Value

128

64

32

16

8

4

2

1

Subnet Mask

128

192

224

240

248

252

254

255

2

4

8

16

32

64

128

256

Bits Borrowed (N)

Number of Subnets
(2^N)

The 'subnet table' is commonly…...

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