Subnetting
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Is dividing the network into smaller networks
For example
You have network with IP address 192.168.8.0/ 24
You can subnet this network into 4 smaller networks called subnets
So you get
192.168.8.0/26
192.168.8.64/26
192.168.8.128/26
192.168.8.192/26
The prefix mask here is 26. With subnnetting the subnet prefix mask will always be grater than the original network prefix mask i.e. /26 > /24
Supernetting
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Is combining smaller subnets into bigger subnet
For example
You have the subnets
192.168.8.0/24
192.168.9.8/24
192.168.10.16/24
192.168.11.24/24
You can combine the above subnets and advertise them as one subnet with IP address 192.168.8.0/ 22
The prefix mask here is 22. With supernnetting the subnet prefix mask will be less than the original network prefix mask i.e. /22 < /24
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