RouterA---------OSPF  Area 0-----------RouterB---------------OSPF  Area
0-------------RouterC
206.202.0.1/24                        206.202.0.2/24    206.202.1.1/24   
                        206.202.1.2/24    

Scenario: You have RIP routing domain and an OSPF Area 0 with
redistribution. To reduce the number of RIP routes, you have to configure
a summary-address in OSPF to only advertise one route to RIP networks.

Configuration for RouterA:

Router-A(config)#router ospf 1
Router-A(config-router)#network 206.202.0.0 0.0.3.255 area 0

I don't understand how they came up with wildcard mask 0.0.3.255. Can
someone elaborate on this.
Thanks in advance.

Fred
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