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 10.0.0.0 255.0.0.0 area 0
- network 10.0.0.0 0.255.255.255 area 0
- network 10.0.0.1 0.0.0.255 area 0
- network 10.0.0.1 0.0.255.255 area 0
Explanation: The network 10.0.0.0 0.255.255.255 area 0 command works because it matches all interfaces whose first octet is 10. The rest of the commands match as follows: all addresses that end with 0.0.0 (wildcard mask 255.0.0.0); all addresses that begin with 10.0.0 (wildcard mask 0.0.0.255); and all addresses that begin with 10.0 (wildcard mask 0.0.255.255).
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