What is classful network?

classfull netwok means all range of IPs have the same of subnetmask

classless network means there is different in subnetmask of networks

for examble i have two network connected through routers

the first network ip is 192.168.2.0 255.255.255.192

the secound network ip is 10.1.2.1.0 255.255.255.240

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