Introducing Routing and Switching in the Enterprise
Chapter 9:
Troubleshooting an Enterprise Network
Online Study Guide
9 / Troubleshooting an Enterprise Network9.1. / Understanding the Impact of Network Failure
9.1.1 / Enterprise Network Requirements
9.1.1.1 / 1. Define network downtime.
2. What issues are associated with a non-reliable network?
9.1.1.2 / 3. List the factors that can cause network downtime.
9.1.1.3 / 4. What is a benefit of redundancy?
5. How does the three-layer hierarchical network design help in network performance?
6. How does a SLA benefit the customer and the provider?
7. What do warranties provide in network reliability?
8. What does a business continuity plan provide to an enterprise?
9.1.2 / Monitoring and Proactive Maintenance
9.1.2.1 / 9. Define proactive maintenance.
10. Define baseline.
11. List the tools that are used to monitor and gather network performance data.
12. How does an administrator use proactive maintenance?
9.1.2.2 / 13. What documentation should be kept to assist in network maintenance?
14. What are the best practices for performing baseline network performance levels?
15. How can a ping be used to help in determining performance baseline?
9.1.2.3 / 16. What information cannot be found by using ping and tracert
17. How can packet sniffing tools help in determining network traffic congestion issues?
9.1.2.4 / 18. Define SNMP.
19. What is the role of an Agent?
20. Define MIB.
21. How do traps or thresholds interact with the NMS.
22. What type of information should a Network Monitoring Plan include?
9.1.2.5 / Packet Tracer Activity
9.1.3 /
Troubleshooting and the Failure Domian
9.1.3.1 / 23. What is the objective of any troubleshooting effort?24. What role does redundancy play in the failure domain?
25. What are hot swappable spares?
9.1.3.2 / 26. What is the highest priority in determining an appropriate solution?
27. List the concerns that a business continuity plan includes.
28. What is a failure domain and what determines it size?
9.1.3.3 / 29. What does the failure of a layer 2 switch effect?
30. Why does the failure of a border router create a larger failure domain?
31. Give an example when the size of the failure domain may not be the deciding factor in troubleshooting.
9.1.3.4 / Interactive Activity
91.4 / Troubleshooting Process
9.1.4.1 / 32. Define Top-down.
33. Define Bottom-up.
34. Define Divide-and conquer.
35. Define Trial-and-error
36. Define Trial and Error
37. Define Substitution.
9.1.4.2 / 38. What is used when a more structured approach is needed to troubleshoot?
39. List the steps in the generic problem-solving model.
40. What layer would mismatched encryption keys be found?
41. Improper cabling or RF signal loss would be found at what layer?
42. What are some common issues found at the Data Link layer?
43. Mis-configured ACLS can be an issue at what layers?
44. Improper routing and improperly configured addresses would be issues at what layer?
9.1.4.3 /
Interactive Activity
9.2 / Troubleshooting Switching and Connectivity Issues9.2.1 / Troubleshooting Basic Switching
9.2.1.1 / 45. Faults at the access layer effect what devices?
46. At what layer do most switch issues occur at and what can be done to prevent them?
47. List the steps to follow if the link LED is not illuminated.
9.2.1.2 / 48. What commands display the switch security configuration?
49. What should be done before altering any security configurations?
50. How can the show mac-address-table and clear mac-address-table dynamic help with switch issues?
9.2.1.3 / 51. What commands allow you to lock down speed and duplex on switchports?
52. What are indicators of STP issues in the network
9.2.1.4 / 53. What can cause an overloaded processor?
54. Where should the root bridge optimally be located?
55. List the commands used to troubleshoot STP.
9.2.1.5 /
Packet Tracer Activity
9.2.2 / Troubleshooting VLAN Configuration Issues9.2.2.1 /
56. Ports in the same VLAN need what in order to communicate?
57. What command displays all the ports and what vlan they are assigned to?
58. What would the show vlan id 5 display?
59. What is required to have inter-VLAN routing?
60. What is the de-facto standard encapsulation and where might it cause a troubleshooting problem?
9.2.2.2 /61. The show ip interface brief command can be used to verify the status of each sub-interface on the router.
/ TrueFalse
62. What should be in the routing table when you issue the show ip route command?
9.2.2.3 /63. What VLAN are untagged frames sent across on a trunk port?
64. What is advisable practice when changing the native VLAN on a device?
9.2.2.4 /Packet Tracer Activity
9.2.3 / Troubleshooting VTP9.2.3.1 /
65. List the information that should be checked when troubleshooting VTP.
66. What command can you enter to check the domain name of a switch?
67. What does VTP version 2 modify on the switch?
9.2.3.2 /68. How do switches use the revision number?
69. How do you reset the revision number on a switch and when should you rest it?
70. What does configuring passwords on the VTP domain prevent?
71. What should you check if updates are not propagating through the network and what command should you enter?
9.2.3.3 /Packet Tracer Activity
9.3 / Troubleshooting Routing Issues9.3.1 / RIP Issues
9.3.1.1 / 72. How do the show and debug commands differ in the output they display?
73. What important information does show ip protocols display?
74. What information does show run tells you that show ip protocols does not?
75. What networks should show up in both show ip route and show ip protocols?
76. When should a command like debug ip rip be used?
9.3.1.2 / 77. List the problems to look for if RIP updates are not being received?
78. In the media scenario, what is the reason R1 is missing routes in the routing table?
79. What is a recommended practice when checking routing problems with the show ip route command?
80. Why is RIP not a good choice in an enterprise network?
9.3.1.3 / Packet Tracer Activity
9.3.1.4 /
Hands on Lab
9.3.2 / EIGRP Issues9.3.2.1 / 81. In the scenario, what is the router ip address of the neighbor on the s0/0/0 interface?
82. In the scenario, what is the metric to the 172.20.1.8 /30 network and how many possible paths are there?
83. In the scenario, how many Hellos have been sent and received?
84. What does the D mean in the routing table?
85. In the scenario, on what interfaces are hello packets being received on?
9.3.2.2 / 86. List he possible reasons EIGRP may not be working?
87. What should be used if discontiguous networks exist in the network design?
88. What is the problem in the scenario and how should it be fixed?
9.3.2.3 / Packet Tracer Activity
9.3.3 / OSPF Issues
9.3.3.1 / 89. List the problems that can occur with OSPF routing?
90. What two show commands can help in adjacency issues?
91. What information can be learned using the show ip ospf command?
9.3.3.2 / Interactive Activity
9.3.3.3 / Hands on Lab
9.3.4 / Route Redistribution Issues
9.3.4.1 / 92. What two routing protocols uses the default-information originate command to redistribute a route?
93. The redistribute static command is entered after issuing what command when configuring a router?
94. What does an * in the routing table indicate?
9.3.4.2 / Hands on Lab
9.3.4.3 / Hands on Lab
9.4 / Troubleshooting WAN Configurations
9.4.1 / Troubleshooting WAN Connectivity
9.4.1.1 / 95. Why are some layer 1 WAN issues unavoidable in a network?
96. What are some common physical problems in a WAN connection?
97. How can the show controllers command help an administrator troubleshoot?
9.4.1.2 / 98. What is a WAN problem when connecting non-Cisco equipment in a network?
99. What command can be used to check the encapsulation?
100. IP addresses must be used on serial links. / True
False
9.1.4.3 / 101. Define SLARP.
102. What must the status of a link be before layer 3 traffic can go across the link?
103. What might be the cause of a WAN problem if the line is up but the protocol is down?
104. What must be done if the line shows administratively down?
9.1.4.4 / 105. What must be verified when troubleshooting PPP?
106. In the scenario, is the link up and if so, what protocols are being sent across it?
107. In the scenario, is authentication being used and if so what kind is it?
108. What is the magic number being used in the scenario?
9.4.1.5 / Packet Tracer Activity
9.4.2 / Troubleshooting WAN Authentication
9.4.2.1 / 109. In the scenario, how does the administrator know that R2 is not using CHAP?
110. When does authentication occur in a PPP WAN connection?
9.4.2.2 / 111. What must exist on both remote ends for authentication to take place?
112. Usernames by default are the router names and are not case sensitive. / True
False
9.4.2.3 / Packet Tracer Activity
9.4.2.4 / Hands on Lab
9.5 /
Troubleshooting ACL Issues
9.5.1 /Determining if an ACL is the Issue
9.5.1.1 / 113. What questions should be asked to help isolate an ACL problem? /114. What can be done to assist in finding answers to the questions? /
9.5.1.2 / 115. In the scenario how many telnet packets have been denied? /
116. Why should you use the clear access-list counters when troubleshooting a new ACL issue? /
117. What can be learned about ACL placement from both the show ip interface and show run command? /
118. What same information does the show run and the show access-list commands tell you? /
119. How can the debug ip packet help you troubleshoot an ACL? /
9.5.1.3 / Interactive Activity
9.5.1.4 / Packet Tracer Activity
9.5.2 /
ACL Configuratio and Placement Issues
9.5.2.1 /120. What traffic should be configures early in the ACL list?
/121. How can logging help troubleshoot an ACL?
/122. In the scenario, what command will show that RIP packets to R2 are being denied?
/123. What type of ACL issue is this an example of?
/9.5.2.2 /
124. Where should a standard ACL be placed?
/125. How can an extended ACL allow more efficient bandwidth usage?
/9.5.2.3 / Packet Tracer Activity
9.5.2.4 / Hands on Lab
9.6 /
Chapter Summary
9.6.1 /Summary
9.6.2 /Critical Thinking
9.7.1 /Chapter Quiz
D03 09: Troubleshooting an Enterprise Network Online Study Guide 9-10