Introducing Routing and Switching in the Enterprise
Chapter 9:
Troubleshooting an Enterprise Network
Online Study Guide
9
9.1.
9.1.1
9.1.1.1
Troubleshooting an Enterprise Network
Understanding the Impact of Network Failure
Enterprise Network Requirements
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
9.1.2.1
Monitoring and Proactive Maintenance
9. Define proactive maintenance.
10. Define baseline.
11. List the tools that are used to
monitor and gather network
performance data.
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
1-10
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?
9.1.2.3
9.1.2.4
15. How can a ping be used to
help in determining
performance baseline?
16. What information cannot be
found by using ping and
tracert
17. How can packet sniffing tools
help in determining network
traffic congestion issues?
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
9.1.3
9.1.3.1
Packet Tracer Activity
Troubleshooting and the Failure Domian
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?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
2-10
9.1.3.2
9.1.3.3
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?
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
91.4
9.1.4.1
Interactive Activity
Troubleshooting Process
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?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
3-10
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
9.2
9.2.1
9.2.1.1
Interactive Activity
Troubleshooting Switching and Connectivity Issues
Troubleshooting Basic Switching
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
9.2.1.3
48. What commands display the
switch security configuration?
49. What should be done before
altering any security
configurations?
50. How can the show mac-addresstable and clear mac-address-table
dynamic help with switch issues?
51. What commands allow you to lock
down speed and duplex on
switchports?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
4-10
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
9.2.2
9.2.2.1
Packet Tracer Activity
Troubleshooting VLAN Configuration Issues
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 interVLAN routing?
60. What is the de-facto standard
encapsulation and where might it
cause a troubleshooting problem?
9.2.2.2
9.2.2.3
9.2.2.4
9.2.3
9.2.3.1
61. The show ip interface brief
command can be used to verify
the status of each sub-interface
on the router.
True
False
62. What should be in the routing
table when you issue the show ip
route command?
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?
Packet Tracer Activity
Troubleshooting VTP
65. List the information that should be
checked when troubleshooting
VTP.
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
5-10
9.2.3.2
66. What command can you enter to
check the domain name of a
switch?
67. What does VTP version 2 modify
on the switch?
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?
9.2.3.3
9.3
9.3.1
9.3.1.1
71. What should you check if updates
are not propagating through the
network and what command
should you enter?
Packet Tracer Activity
Troubleshooting Routing Issues
RIP Issues
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?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
6-10
9.3.1.3
9.3.1.4
9.3.2
9.3.2.1
80. Why is RIP not a good choice in
an enterprise network?
Packet Tracer Activity
Hands on Lab
EIGRP Issues
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?
9.3.2.2
9.3.2.3
9.3.3
9.3.3.1
85. In the scenario, on what interfaces
are hello packets being received
on?
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?
Packet Tracer Activity
OSPF Issues
89. List the problems that can occur
with OSPF routing?
90. What two show commands can
help in adjacency issues?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
7-10
91. What information can be learned
using the show ip ospf
command?
9.3.3.2
9.3.3.3
9.3.4
9.3.4.1
9.3.4.2
9.3.4.3
9.4
9.4.1
9.4.1.1
Interactive Activity
Hands on Lab
Route Redistribution Issues
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?
Hands on Lab
Hands on Lab
Troubleshooting WAN Configurations
Troubleshooting WAN Connectivity
95. Why are some layer 1 WAN
issues unavoidable in a network?
96. What are some common physical
problems in a WAN connection?
9.4.1.2
9.1.4.3
9.1.4.4
97. How can the show controllers
command help an administrator
troubleshoot?
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
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?
105. What must be verified when
troubleshooting PPP?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
8-10
9.4.1.5
9.4.2
9.4.2.1
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?
Packet Tracer Activity
Troubleshooting WAN Authentication
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
9.4.2.3
9.4.2.4
9.5
9.5.1
9.5.1.1
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.
Packet Tracer Activity
Hands on Lab
Troubleshooting ACL Issues
Determining if an ACL is the Issue
113. What questions should be asked
to help isolate an ACL problem?
True
False
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 accesslist commands tell you?
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
9-10
9.5.1.3
9.5.1.4
9.5.2
9.5.2.1
9.5.2.2
9.5.2.3
9.5.2.4
9.6
9.6.1
9.6.2
9.7.1
119. How can the debug ip packet
help you troubleshoot an ACL?
Interactive Activity
Packet Tracer Activity
ACL Configuratio and Placement Issues
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?
124. Where should a standard ACL be
placed?
125. How can an extended ACL allow
more efficient bandwidth usage?
Packet Tracer Activity
Hands on Lab
Chapter Summary
Summary
Critical Thinking
Chapter Quiz
D03 09: Troubleshooting an Enterprise Network
Online Study Guide
10-10