200-301: Cisco Certified Network AssociateDemo

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QuestionQ1236

Network Fundamentals

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Refer to the exhibit. An engineer needs to configure router R2 so that it is elected as the DR on the WAN subnet. Which command sequence must be configured?

  • A interface gigabitethernet0/0 ip address 10.0.0.34 255.255.255.248 ip ospf priority 0
  • B interface gigabitethernet0/0 ip address 10.0.0.34 255.255.255.224 ip ospf priority 100
  • C interface gigabitethernet0/0 ip address 10.0.1.1 255.255.255.0 ip ospf priority 255
  • D interface gigabitethernet0/0 ip address 10.0.1.1 255.255.255.224 ip ospf priority 98
Explanation

On the 10.0.0.32/27 WAN segment, R2 must have an address in that same subnet and an OSPF interface priority higher than R1’s configured priority of 99. OSPF elects the DR on broadcast networks by highest interface priority, and a priority of 0 makes a router ineligible. The valid configuration is the one that assigns R2 the WAN-subnet address 10.0.0.34/27 and sets ip ospf priority 100, which is higher than 99.

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