Calculate Wildcard-mask

Use the wildcard-mask option with the network command to advertise only the subnet and not the
entire classful network.

Note: Think of a wildcard mask as the inverse of a subnet mask. The inverse of the subnet mask is To calculate the inverse of the subnet mask, subtract the subnet mask from
–   Subtract the subnet mask
0 . 0 . 0 . 15   Wildcard mask

R1(config-router)# network


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