200-301: Cisco Certified Network AssociateDemo

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QuestionQ911

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An engineer has just installed network 10.120.10.0/24. Which configuration must be applied on router R14 to add the new network to its OSPF routing table?

  • A Router ospf 100 Network 10.120.10.0 0.0.0.255 area 0
  • B Router ospf 120 Network 10.120.10.0 255.255.255.0 area 0 Ip route 10.120.10.0 255.255.255.0 fa0/1
  • C Router ospf 100 area 0 Network 10.120.10.0 0.0.0.255
  • D Router ospf 100 Network 10.120.10.0 255.255.255.0 area 0
Explanation

Cisco IOS OSPF enables interfaces with the network <address> <wildcard-mask> area <area-id> command under the correct OSPF process. For network 10.120.10.0/24 in OSPF process 100 and area 0, the matching statement is network 10.120.10.0 0.0.0.255 area 0. A /24 uses wildcard mask 0.0.0.255, and OSPF expects a wildcard mask here rather than a subnet mask. That is why the configuration in choice A is correct.

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