New network 10.120.10.0/24 was added. Which OSPF command on R14 advertises that network into OSPF area 0?
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Correct answer: Router ospf 100 Network 10.120.10.0 0.0.0.255 area 0.
Why this is the answer
The correct command is Router ospf 100 Network 10.120.10.0 0.0.0.255 area 0. This command correctly identifies the OSPF process ID (100), specifies the network address (10.120.10.0), uses the wildcard mask (0.0.0.255) to match the /24 subnet, and assigns it to OSPF area 0. The second option is incorrect because it uses an incorrect OSPF process ID (120), an incorrect wildcard mask (255.255.255.0 is a subnet mask, not a wildcard mask), and includes an extraneous and incorrect Ip route command. The third option is incorrect because the area 0 keyword is misplaced; it should come after the wildcard mask. The fourth option is incorrect because it uses an incorrect wildcard mask (255.255.255.0), which is a subnet mask, not a wildcard mask. OSPF network commands require a wildcard mask.
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