Answer :
After 'router ospf 1', the 'network' command instructs the router to start using OSPF on specific interface addresses, such as 10.1.1.1, 10.1.100.1, and 10.1.120.1. This enables OSPF routing protocol to function on those interfaces.
The command that instructs the router to start enabling OSPF on specific interface addresses is the network command. Following 'router ospf 1', the command would be formatted as: 'network 10.1.1.1 0.0.0.0 area 0' for the address 10.1.1.1. The network command is followed by the IP address, then a wildcard mask (0.0.0.0 for a specific IP), and then the area to which the interface connects. Similarly for 10.1.100.1 and 10.1.120.1, the respective commands would be 'network 10.1.100.1 0.0.0.0 area 0' and 'network 10.1.120.1 0.0.0.0 area 0'.
In conclusion, the 'network' command following 'router ospf 1' activates OSPF on specified interface addresses, allowing OSPF routing protocol to function.
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