How to Perform Subnetting Calculation? How to Find Subnet mask in the Subnetting?

172.168.0.1/20->8+8+4=20
NO of Binary extra value is: 4(left to right in the table)
So there subnets mask: 240
And there no of host or client system :15( right to left in the table)
Network id: 172.168.0.0
Host id: 0.0.255.255
Subnet mask: 255.255.240.0
See the following table: for explanation
---->LEFT to Right <----
Subnet mask : 128 128+64=192 192+32=224 240 248 252 254 255How to calucate subnet mase no of host in networking
DECIMAL Value: 128 64 32 16 8 4 2 1
NO OF HOST: 255 127 63 31 15 3+4=7 1+2=3 1
--->Right to LEFT <-----

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