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ccna 200 301 syllabus examples coursesmart.After you configure router R1, hold off on configuring routers R2 and R3,and later the following message appears on R1.*Mar1 00:32:06.631: %OSPF-5-ADJCHG: Process 1,Nbr 33.3.3.3 on FastEthernetO/O fromFULL to DOWN, Neighbor Down: Deadtimer expired *Mar1 00:32: 07.199: %OSPF-5~ADJCHG: Process1, Nbr 123.1.1.2 on FastEthernet0/0 from FULL to DOWN, Neighbor Down: Deadtimer expired *Mar1 00:32:08.095: %OSPF-5- ADJCHG: Process lt Nbr 123.1.1.2 on Seriall/1 from FULL to DOWN, Neighbor Down: Dead timer expiredPrompting all neighbors to time out, Neighbor Down Down. Using the ushowip ospfneighbor command to view R1's OSPF neighbors, thecannot find any neighboring routers. Use the "debug ip ospfadj" command on router RkR2 or R3 to debug the OSPF neighbors.The following is displayed.Rl#debug ip ospf adj OSPFadjacencyevents debugging is on Rl# '' ''". . .? : '. *Mar 1 00:44:46.675: OSPF:Rev pkt from123.1.1.3, FastEthernet0/0 :Mismatch Authentication type. input packet specified type 0,we usetype 1As you can see from the above output, R1 receives OSPF packets from interface Fa 0/0, but the authentication type is inconsistent. The incoming packet uses the authentication typeThe authentication type used for the incoming message is 0, i.e., no authentication; the authentication type used by this router is 1, i.e., plaintext authentication. With inconsistent authentication types, adjacency relationships cannot be established, much lessIt is not possible to interact with routing information. Continue with the following command to configure routers R2 and R3 to use plaintext authentication.R2(config)#int sl/0 R2(config-if)#ip ospf authentication-key cisco R2(config-if)#intfa 0/0 R2(config-if)#ip ospf authentication-key cisco R2( config-if)#router ospf 1 R2(config-router)#area 0 authentication