Routes Announced Using the Network Statement with Mask
Networks that fall on a major net boundary (255.0.0.0, 255.255.0.0, or 255.255.255.0) do not need to have a mask included. For example, the network 172.16.0.0 command is sufficient to send the…
http://www.ebrahma.com/2014/04/routes-announced-using-the-network-statement-with-mask/

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