Classful vs. Classless

Classful

• Only pass the network address and not the subnet mask, i.e., (1.0.0.0)

• Loss of accuracy and result in black hole

• e.g., RIP

Classless

• Pass both the network address and the subnet mask, i.e., (1.2.0.0,255.255.0.0)

• Can summarize at arbitrary boundary

• e.g., OSPF

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