200-301 Question #1753: Real Exam Question with Answer & Explanation

Question

Lab Simulation 63 Please use the "Tasks" and "Topology" tabs to complete this lablet. Topology Tasks Configure OSPF routing for the network by completing the following tasks. Task 1 - Configure OSPF on R1: - use process ID 30 - use E0/0 IP as the router ID Task 2 - Establish neighbor adjacencies with R2 and R3 by enabling OSPF directly on the relevant interfaces. - Ensure R1 always become the DR. Answer: Task 1: Basic OSPF Configuration - Process ID 30 - Router-ID = E0/0 IP address (10.0.12.1) R1# conf t interface e0/0 ip ospf 30 area 0 interface e0/1 ip ospf 30 area 0 router ospf 30 router-id 10.0.12.1 OSPF uses the manually set router-ID (10.0.12.1 from E0/0). Enabling OSPF on E0/0 and E0/1 allows R1 to form adjacencies with R2 and R3. Task 2: Interface Configuration and DR Priority To make R1 always the DR, set its OSPF interface priority highest (e.g., 255) on both links. interface e0/0 ip ospf priority 255 interface e0/1 ip ospf priority 255 On R2 and R3, interfaces connected to R1 must be placed into OSPF area 0 with lower priority, typically default (1) or set to 0 if needed. R2# conf t interface e0/0 ip ospf 30 area 0 ip ospf priority 1 ! default is fine interface e0/1 ip ospf 30 area 0 R3# conf t interface e0/0 ip ospf 30 area 0 interface e0/1 ip ospf 30 area 0 OSPF elects the DR based on interface priority. With R1 set to 255, it always wins the DR election on all multiaccess segments in Area 0.

Options

• taskConfigure OSPF routing for the network by completing the following tasks: Task 1 - Configure OSPF on R1 using process ID 30 and E0/0 IP as the router ID. Task 2 - Establish neighbor adjacencies with R2 and R3 by enabling OSPF directly on the relevant interfaces, ensuring R1 always becomes the DR.
• prerequisitesAccess to 'Tasks' and 'Topology' tabs within the lab environment.