200-301: Cisco Certified Network AssociateDemo

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QuestionQ5

IP Services

Refer to the exhibit. A network associate configured OSPF with the command:

City(config-router)# network 192.168.12.64 0.0.0.63 area 0

After finishing the configuration, the associate finds that not all interfaces are participating in OSPF. Based on this configuration statement, which three interfaces shown in the exhibit will participate in OSPF?

Question Image

Choose three
  • A FastEthernet0 /0
  • B FastEthernet0 /1
  • C Serial0/0
  • D Serial0/1.102
  • E Serial0/1.103
  • F Serial0/1.104
Explanation

In Cisco OSPF, the network command enables OSPF on interfaces whose IP addresses fall within the address range defined by the network address and wildcard mask. The wildcard 0.0.0.63 matches a /26 block, so network 192.168.12.64 0.0.0.63 area 0 covers addresses from 192.168.12.64 to 192.168.12.127. The interfaces in that range are 192.168.12.65, 192.168.12.121, and 192.168.12.125, which correspond to FastEthernet0/1, Serial0/0, and Serial0/1.102.

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