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Refer to the exhibit. A network administrator wants to add all the interfaces of router R1 to the OSPF network. The administrator executes the following line in the router= "R1(config-router)#network 172.16.12.32 0.0.0.31 area 0" but only three interfaces seems to participate in the OSPF network. What can be done to solve this issue?
Issue the line "R1(config-router)#network 172.16.12.32 0.0.0.7 area 0"
Issue the line "R1(config-router)#network 172.16.12.32 0.0.0.15 area 0"
Issue the line "R1(config-router)#network 172.16.12.0 0.0.0.63 area 0"
Issue the line "R1(config-router)#network 172.16.12.0 0.0.0.127 area 0"
If the command "R1(config-router)#network 172.16.12.32 0.0.0.31 area 0" is executed, only three interfaces will participate in the OSPF network (loopback0, Serial0 and Serial1), because they belong to network 255.255.255.224 (/27) which is represented by the wildcard mask 0.0.0.31. The only network that can cover up all interfaces is "network 172.16.12.0 0.0.0.127 area 0", which represents network 172.16.12.0/25 (first host 172.16.12.1 to last host 172.16.12.126) which cover all interfaces.
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