How to Do Subnetting
Before doing subnetting 5 questions should come to our mind. What are those Questions ?
1. How many Sub NetWorks ?
2. How many host per sub n/w ?
3. What are the Valid Sub N/w Address ?
4. What are the valid Direct Broadcast addresses ?
Let’s take a example. We will take a example of Class C-Address
192.168.10.100/26
So, it is a class C-Address .
1. Find out the Network Address i.e 192.168.10.0
2. Find Out the Subnet Mask i.e 255.255.255.192
3. Binary of 192=1100000
On bit =2 and Off Bit =6
No of Sub networks =2^n=2^2=4
No of Host Per Sub N/ws=2^n-2=2^6-2=64
S.A F.V.H.A L.V.H.A D.B.A
192.168.10.0 192.168.10.1 192.168.10.62 192.168.10.63
192.168.10.64 192.168.10.65 192.168.10.126 192.168.10.127
192.168.10.128 192.168.10.129 192.168.10.190 192.168.10.191
192.168.10.192 192.168.10.192 192.168.10.254 192.168.10.255
Note : S.A=Subnetwork Address, FVHA=First Valid Host Address
LVHA=Last Valid Host Address, DBA=Directed Broadcast Address
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