SIMULATION 75 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Configure OSPF routing for the network by completing the following tasks: Task 1 Configure OSPF on R2. Ensure R1 and R3 become neighbors. ● Use process ID 30. ● Use 10.22.22.22 as the router ID. ● Under the OSPF process, advertise the following specific prefixes: - 10.0.23.0/28 - 10.0.12.0/30 Task 2 Ensure R2 always becomes the DR. Answer: - R2 OSPF configuration (process 30, router-id, and only the two required prefixes in area 0): conf t router ospf 30 router-id 10.22.22.22 network 10.0.23.0 0.0.0.15 area 0 network 10.0.12.0 0.0.0.3 area 0 - Ensure R2 always becomes the DR (set highest OSPF interface priority on the multiaccess/broadcast segments): interface e0/0 ip ospf priority 255 interface e0/1 ip ospf priority 255 - If a DR/BDR already exists, force a new election after changing priority (one of these): clear ip ospf process (or) shut/no shut the OSPF-enabled interfaces on the segment

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200-301 · Question #1787

SIMULATION 75 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Configure OSPF routing for the network by completing the following tasks: Task 1 Configure OSPF on R2. Ensure

Submitted by suresh_in· Mar 5, 2026IP Connectivity – Configure and verify single-area OSPFv2, including router ID, network advertisement, and DR/BDR election manipulation (Cisco CCNA Exam Topic 3.4)

Question

SIMULATION 75 Please use the “Tasks” and “Topology” tabs to complete this lablet. Topology Configure OSPF routing for the network by completing the following tasks:

Task 1 Configure OSPF on R2. Ensure R1 and R3 become neighbors. ● Use process ID 30. ● Use 10.22.22.22 as the router ID. ● Under the OSPF process, advertise the following specific prefixes:

10.0.23.0/28
10.0.12.0/30

Task 2 Ensure R2 always becomes the DR. Answer:

R2 OSPF configuration (process 30, router-id, and only the two required prefixes in area 0):

conf t router ospf 30 router-id 10.22.22.22 network 10.0.23.0 0.0.0.15 area 0 network 10.0.12.0 0.0.0.3 area 0

Ensure R2 always becomes the DR (set highest OSPF interface priority on the

multiaccess/broadcast segments):

interface e0/0 ip ospf priority 255 interface e0/1 ip ospf priority 255

If a DR/BDR already exists, force a new election after changing priority (one of these):

clear ip ospf process (or) shut/no shut the OSPF-enabled interfaces on the segment

Explanation

The correct answer properly configures OSPF process 30 with router-id 10.22.22.22 and advertises exactly the two required subnets using correct wildcard masks (0.0.0.15 for /28 and 0.0.0.3 for /30) in area 0, enabling R1 and R3 to form OSPF neighbor relationships with R2. Setting ip ospf priority 255 on both R2's interfaces (e0/0 and e0/1) guarantees R2 wins the DR election on all multiaccess segments, since OSPF elects the router with the highest interface priority as DR, and 255 is the maximum possible value. The solution is complete because it addresses both Task 1 (OSPF process, router-id, and correct network statements) and Task 2 (DR election manipulation via priority).

Topics

#OSPF Configuration#DR/BDR Election#Wildcard Masks#Router ID

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