CCNA 2/M9: Basic Router Troubleshooting
Online Curriculum Notes
Curriculum
overview
9.1.1
9.1.2
9.1.3
9.1.4
9.1.5
Question
1. What does a router do when it
determines that a route is the best path
to a destination?
2. What are the 2 most time consuming
jobs of a network administrator?
3. What type of equipment causes the
most difficult network problems?
4. What is the function of a router?
Answer
5. What do routers read to make packet
forwarding decisions?
6. What does the command show ip
route display?
7. What type of route is manually
programmed into the router?
8. What type of route can change
automatically as neighboring routers
update each other with new
information?
9. What is used when the router is unable
to match a destination network with an
entry in it's routing table?
11. What command establishes a default
route in networks using dynamic
routing protocols?
12. What Layer determines the best path
for a packet?
13. What device determines the best path
and forwards the packet from an
incoming interface to an outgoing
interface?
14. What address is used to get packets
from source to destination?
15. What address never changes, no
matter how many hops the packet
takes?
16. What address determines the next
hop?
17. What address changes at each hop or
router?
18. Interactive Media: D&D L2 & L3
Address
19. What is the number called that
measures the trustworthiness of the
source of the route information?
e-Lab Activity: Administrative Distance
1
9.1.6
20. What metric does RIP v1 use?
21. Which metric is better - a small number
of a large number?
22. What are IGRP's default metrics?
Interactive Media: D&D Route Metric
9.1.7
9.1.8
9.1.9
9.2.1
9.2.2
9.2.3
9.2.4
9.2.5
9.2.6
9.3.1
23. What will the show ip protocols
command show?
24. What does IGRP use to balance the
load on multiple links?
25. What layer should you start with in
testing the network?
26. What is the most common problem on
IP networks?
Interactive Media: Network Testing
27. What is a very important part of the
troubleshooting process?
Interactive Media Activity: Drag and Drop: Troubleshooting
28. What layer would a Transceiver
problem be at?
29. What layer would an Improperly
configured serial interface be at?
30. What layer would an incorrect IP
address be?
31. What command is used to test
connectivity?
Interactive Media Activity: Matching: Testing with the OSI layers
32. What is another name for the
"indicator" light on a NIC card that
indicates a valid connection?
33. What should you do if the interface has
indicator lights that do not show a valid
connection?
34. What 3 things are displayed when a
ping packet finds a specified system
and returns?
35. What does 5 exclamation points
indicate?!!!!!
36. What command would you use to
perform more extensive ping tests?
37. Look at the chart. Which ICMP
message type notifies source hosts that
a receiving host or network is not
available?
e-Lab Activity: Layer 3 Troubleshooting Using ping
38. What layers does Telnet test?
39. What line from the show interfaces
output would indicate a Layer 2
2
9.3.2
9.3.3
9.3.4
9.3.5
9.3.6
9.3.7
problem?
40. What would an increasing number of
carrier transitions counts on a serial link
indicate?
e-Lab Activity: Troubleshooting Layer 1: Using show interfaces
41. What are messages sent by one
network device to inform another
network device that the virtual circuit
between the two is still active?
Interactive Media Activity Drag and Drop: show interface interface command
e-Lab Activity: Troubleshooting Layer 1: Using show interfaces
42. Who does CDP allow you to discover
information about?
e-Lab Activity: Cisco Discovery Protocol
43. What command is used to discover the
routes that packets take when traveling
to their destination?
44. What command shows the entries for
all known networks and subnetworks,
and how that information was learned?
45. What command would identify a router
that is delivering bad router
information?
46. What command would allow you to
check a cable connection if you were in
Los Angeles and the router was in New
York?
e-Lab Activity: Troubleshooting Using show controllers serial
47. What command will turn off all
diagnostic output?
48. What command will show what is being
examined by a debug command?
3