Classless Vs Classful?
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Classless: Classless addressing is an IP addressing concept where the network portion of an IP address is not defined to a predetermined length. Instead, the network portion of an IP address is defined by a subnet mask. Classless addressing allows for more efficient use of IP address space than classful addressing.
Classful: Classful addressing is an IP addressing concept where the network portion of an IP address is defined to a predetermined length. The address space is divided into five classes: A, B, C, D and E, each of which has a different number of bits for the network portion of the IP address. Classful addressing does not support subnetting, so the network portion of the address cannot be further divided.