Theory 2
How Many Subnets 2

The special chart below will get enable you to answer any question in the exam.  I call it the Subnetting Secrets Chart© This chart will ensure you can answer any subnetting question in an exam or during an interview within about 15 seconds (after practise!).

Bits

128 64 32 16 8 4 2 1

Subnets

128
192
224
240
248
252
254
255
Powers of Two Subnets Hosts 

-2

2
4
8
16
32
64
128
256
512
1024
2048
4096

Subnetting Secrets Chart©

INSPIRATION: The above chart will enable you to quickly and accurately answer any subnetting question in the exam.  Students on my Cisco CCNA boot camp have saved weeks of study time and valuable exam minutes by using the Subnetting Secrets Chart©

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