October 06, 2018 - 
CCNA Skills,Subnetting
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CCNA Skills,Subnetting
No comments
IPv4 Subnetting: Understanding Binary Number
Focus: We will use 8bits binary number or an octet value which is our focus in subnetting.
Given the binary of 11111111
Set the exponent value starting 0 from right to left in every bit position.
Exponent Value 7 6 5 4 3 2 1 0
Binary 1 1 1 1 1 1 1 1
Multiply the base value to the exponent of a particular bit position 2n.
n = 0 20 =1
|
n = 1 21 = 2
|
n = 2 24 = 4
|
n = 3 23 = 8
|
n = 4 24 =16
|
n = 5 25 = 32
|
n = 6 26 = 64
|
n = 7 27 = 128
|
255
|
=
|
128
|
64
|
32
|
16
|
8
|
4
|
2
|
1
|
11111111
|
=
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
1
|
So by default, we call them constant value of every bit position in an 8 bits value.
Be speedy in adding up the values at random bit positions.
128+64 = 192 , 128+32 = 160 and so on.
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