Create another scenario as a duplicate of the no_areas scenario. name the new scenario q4_no_areas_failure. in this new scenario simulate a failure of the link connecting routerd and rotuere. have this failure start after 100 seconds. rerun the simulation. show how that link failure affects the content of the link- state database and routing table of routera. (you will need to disable the global attribute ospf sim efficiency. this will allow ospf to update the routing table if there is any change in the network.)