Troubleshooting Exercises

1:	OSPF is not working between two routers. When debugging is turned on, the messages shown in Figure 9.107 are received every 10 seconds. What is the problem? Figure 9.107. The debug messages for Troubleshooting Exercise 1.
2:	Explain what problem is indicated by the debug messages in Figure 9.108. Figure 9.108. The debug messages for Troubleshooting Exercise 2.
3:	Explain what problem is indicated by the error messages in Figure 9.109. Figure 9.109. The error messages for Troubleshooting Exercise 3.
4:	Explain what problem is indicated by the error messages in Figure 9.110. Figure 9.110. The error messages for Troubleshooting Exercise 4.
5:	Explain what problem is indicated by the error messages in Figure 9.111. Figure 9.111. The error messages for Troubleshooting Exercise 5.
6:	The configurations for the routers in Figure 9.112 follow. A routerospf15 network192.168.50.2240.0.0.31area192.168.50.0 network192.168.50.2400.0.0.15area0.0.0.0 area192.168.50.0authenticationmessage-digest B routerospf51 network192.168.50.00.0.0.255area0 Routers A and B are not forming an adjacency . What is wrong? Figure 9.112. The internetwork for Troubleshooting Problem 6.
7:	Figure 9.113 shows a link state database from an area in which an unstable link exists. Based on the information shown, which link is the likely culprit? Figure 9.113. The link state database for Troubleshooting Exercise 7.