Which of the following network commands, following the command router ospf 1, tells this router to start using OSPF on interfaces whose IP addresses are 10.1.1.1, 10.1.100.1, and 10.1.120.1?
- network 10.1.0.0 0.0.255.255 area 0
- network 10.0.0.0 0.255.255.0 area 0
- network 10.1.1.0 0.x.1x.0 area 0
- network 10.1.1.0 255.0.0.0 area 0
- network 10.0.0.0 255.0.0.0 area 0
Explanation: The network 10.1.0.0 0.0.255.255 area 0 command matches all IP addresses that begin with 10.1, enabling OSPF in area 0 on all interfaces. The answer with wildcard mask 0.255.255.0 is illegal because it represents more than one string of binary 0s separated by binary 1s. The answer with x’s is syntactically incorrect. The answer with wildcard mask 255.0.0.0 means “Match all addresses whose last three octets are 0.0.0,” so none of the three interfaces are matched.
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