350-401 Question #1245: Real Exam Question with Answer & Explanation

Question

Lab Simulation 27 Guidelines This is a lab item in which tasks will be performed on virtual devices. - Refer to the Tasks tab to view the tasks for this lab item. - Refer to the Topology tab to access the device console(s) and perform the tasks. - Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window. - All necessary preconfigurations have been applied. - Do not change the enable password or hostname for any device. - Save your configurations to NVRAM before moving to the next item. - Click Next at the bottom of the screen to submit this lab and move to the next question. - When Next is clicked, the lab closes and cannot be reopened. Topology Tasks Answer: Copy run start Copy run start Copy run start Verification:

Options

• taskOSPF is partially configured. Complete the OSPF configurations to achieve these goals: 1. Configure R3 and R20 so they do not participate in a DR/BDR election process in Area 20. 2. Configure R10 so it is always the DR for Area 10. Do not change the router ID.
• prerequisitesConsole access to virtual devices

Explanation

The correct solution addresses both OSPF DR/BDR election requirements: setting interface priority to 0 on R3 and R20's Area 20 interfaces prevents them from participating in DR/BDR elections (priority 0 means a router can never become DR or BDR), while setting priority to 255 on R10's Area 10 interface guarantees it always wins the DR election since the highest priority value wins. The 'copy run start' commands ensure configurations persist across reboots as required by the lab guidelines. The area range command on R10 also summarizes the 10.1.0.0/16 network for efficient routing.

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