Chapter 11 1029
Answers:
BAUD = 9600
DATA BITS = 8
PARITY = None
STOP BITS = 1
FLOW CONTROL = None
4. Which of the following is true at initial boot-up output?
A. The Cisco IOS Software version that the router uses can be seen.
5. Which of the following is true at initial boot-up output?
A. The amount of Flash memory can be seen.
6. Match the commands on the left with the correct descriptions on the right.
Ctrl + a Moves out of configuration mode
Ctrl + b Moves to the end of the command line
Ctrl + e Moves back one word
Ctrl + f Moves to the beginning of the command line
Esc + b Moves forward one character
Esc + f Moves forward one word
Ctrl + z Moves back one character
Answers:
Ctrl + A: Moves to the beginning of the command line
Ctrl + B: Moves back one character
Ctrl + E: Moves to the end of the command line
Ctrl + F: Moves forward one character
Esc + B: Moves back one word
Esc + F: Moves forward one word
Ctrl + Z: Moves out of configuration mode
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1030 Appendix C: Check Your Understanding Answer Key
7. Match the commands on the left with the correct descriptions on the right.
Tab Enables advanced editing

Ctrl + P Sets the command buffer size
Ctrl + N Recalls the most recent command
show history Shows the command buffer
terminal history size # Recalls the last command
terminal editing Completes the entry
no Terminal editing Disables advanced editing features
Answers:
Tab: Completes the entry
Ctrl + P: Recalls the last command
Ctrl + N: Recalls the most recent command
show history: Shows the command buffer
terminal history size #: Sets the command buffer size
terminal editing: Enables advanced editing
No Terminal editing: Disables advanced editing features
8. What are the major elements of a typical router configuration?
A. Passwords, interfaces, routing protocols, DNS
9. Which of the following correctly describes a method for specifying how a router
loads the Cisco IOS Software?
A. Designate fallback sources for the router to use in sequence from NVRAM.
10. Which of the following is not a boot option that can be set with the configuration
register boot field?
C. Cisco IOS Software automatically boots from a TFTP server.
11. Which of the following is information displayed by the Cisco IOS Software
show version command?
B. The name of the system image
12. Which of the following has a limited version of router Cisco IOS Software?
A. ROM
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Chapter 12 1031
13. If you want to completely back out of configuration mode, which of the follow-

ing must you enter?
A. Exit
14. If you are planning to configure an interface, what prompt should be on the
router?
D. router(config-if)#
15. What is the acronym used to describe a Cisco router’s text-based user interface?
A. CLI
16. What two modes of access to router commands exist for Cisco routers?
A. User and privileged
17. Which mode do you use to make router configuration changes on Cisco routers?
B. Privileged
Chapter 12
1. What is a standard?
B. A set of rules or procedures that are either widely used or officially specified
2. A description on an interface does what?
C. Displays a comment about the interface
3. A good example of a login banner is what?
C. Authorized access only
4. What is host name resolution?
A. The process of associating a name with a network location
5. Configuration backup and documentation is necessary to an organization to
maintain an efficient network. True or false?
A. True
6. Backup of configuration files is not necessary. True or false?
B. False
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1032 Appendix C: Check Your Understanding Answer Key
7. A TFTP server is the only location where backup files can be stored. True or
false?
B. False

8. If you are planning to configure an interface, what prompt should be on the
router?
D. router(config-if)#
9. Which of the following is the correct order for the process of configuring a
router? (Assume that you have already made router changes in configuration
mode.)
B. Examine the results, decide whether the changes are your intended results,
save the changes to backup, and examine the backup file.
10. Which of the following is a command that can be used to save router configura-
tion changes to a backup?
A. Router# copy running-config tftp
11. Which of the following correctly describes password configuration on routers?
C. A password can be established on all incoming Telnet sessions.
12. Which of the following does not describe password configuration on routers?
A. Passwords can be established in every configuration mode.
13. What is used for one-line commands that change the entire router?
A. Global configuration mode
14. What does the exit command do in a configuration mode with the prompt
Router(config-if)#?
A. It quits the current configuration interface mode.
15. What are the major elements of a typical router configuration?
A. Passwords, interfaces, routing protocols, DNS
16. In a password-recovery procedure, immediately after issuing a Ctrl-BREAK upon
router startup, what should be the config register setting?
B. 0x2142
17. In a password-recovery procedure, just before saving the running config and
after you have enabled a new secret password, what should be the config register
setting?
0x2102
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Chapter 13 1033
Chapter 13
1. What is a definition for telnet?
C. A command used to verify the application layer software between source
and destination stations. This command is the most complete test mechanism
available.
2. What information does testing a network by using the show interfaces serial
command provide?
A. It displays line and data link protocol status.
3. What information does the show cdp neighbors command provide for each
CDP neighbor?
D. All of the above
4. The show cdp interface command is used to display which of the following?
D. Both A and B
5. Which of these is true for the output of the command show cdp entry
[device name]?
A. It displays all the Layer 3 addresses present in the neighbor router.
6. To display the information that is obtained both from the show cdp neighbors
and show cdp entry [device name] commands, which of the following commands
is used?
A. show cdp neighbors detail
7. What information is displayed by the show cdp neighbors command?
D. All of the above
8. What four important pieces of information do you receive after issuing a ping
command?
A. The size and quantity of ICMP packets; the timeout duration; the success
rate; and the minimum, average, and maximum round-trip times
9. What information does testing a network by using the traceroute command
provide?
C. It maps every router that a packet goes through to reach its destination.

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1034 Appendix C: Check Your Understanding Answer Key
10. In reply to the ping command, exclamation points (!) indicate which of these?
A. The number of successful echos
11. What is true of the router debug commands?
D. Both A and B.
Chapter 14
1. Which of the following correctly describes a method for specifying how a router
loads the Cisco IOS software?
A. Designate fallback sources for the router to use in sequence from NVRAM.
2. Which of the following is not a boot option that can be set with the configura-
tion register boot field?
C. Cisco IOS Software automatically boots from a TFTP server.
3. Which of the following is information displayed by the show version command?
B. The name of the system image
4. Which command is used to discover the configuration register setting?
C. show version
5. What information is not provided in the Cisco image filename system?
D. The size of the image
6. Which of the following is not part of the recommended procedure for loading
a new Cisco IOS Software image to Flash memory from a TFTP server? (The
procedures are listed in correct order.)
B. Enter the copy flash tftp command to start downloading the new image from
the server.
7. What is the initial boot attempt if the router configuration register is set to
0x101?
C. ROM
8. Which of the following has a limited version of router Cisco IOS Software?
A. ROM
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Chapter 15 1035
9. What is the initial boot attempt if the router configuration register is set to
0x102?
D. Check for boot system commands
10. Which of the following is the sequence used by the router for automatic fallback
to locate the Cisco IOS Software?
D. TFTP server, (2) Flash memory, (3) NVRAM
11. Which of the following is not displayed by the Cisco IOS show version
command?
A. Statistics for configured interfaces
12. Which of the following correctly describes preparing to use a TFTP server to
copy software to Flash memory?
A. The TFTP server must be a connected router or a host system, such as a
UNIX workstation or a laptop computer.
13. Why do you create a Cisco IOS Software image backup?
D. To create a fallback copy of the current image before updating with a new
version
14. What is the command you need to issue if you want to upgrade an old version of
the Cisco IOS Software by downloading a new image from the TFTP server?
B. copy tftp flash
Chapter 15
1. Which of the following best describes one function of Layer 3, the network layer,
in the OSI model?
C. It determines which is the best path for traffic to take through the network.
2. What function allows routers to evaluate available routes to a destination and to
establish the preferred handling of a packet?
B. Path determination
3. How does the network layer forward packets from the source to the destination?
A. By using an IP routing table
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1036 Appendix C: Check Your Understanding Answer Key
4. What two parts of a network layer address do routers use to forward traffic
through a network?
A. Network address and host address
5. Which of the following best describes a routed protocol?
A. Its address provides enough information to allow a packet to be forwarded
from host to host.
6. Which of the following best describes a routing protocol?
A. A protocol that accomplishes routing through the implementation of an
algorithm
7. What is one advantage of distance vector algorithms?
D. They are computationally simple.
8. Which of the following best describes a link-state algorithm?
A. It recreates the exact topology of the entire internetwork.
9. Why do routing loops occur?
A. Slow convergence occurs after a modification to the internetwork.
10. Which of the following best describes balanced hybrid routing?
A. It determines best paths, but topology changes trigger routing table updates.
11. What is a network with only one path to a router called?
D. Stub network
12. Which best describes a default route?
C. Route used when the destination network is not listed explicitly in the routing
table
Chapter 16
1. What kind of entries does a router initially refer to?
A. Entries about networks or subnets that are directly connected
2. Which of the following best describes a static route?
B. A route that is explicitly configured and entered into the routing table and
that takes precedence over routes chosen by dynamic routing protocols
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Chapter 16 1037
3. Which of the following best describes a default route?
A. A routing table entry that is used to direct frames for which a next hop is not
explicitly listed in the routing table
4. What are exterior routing protocols used for?
C. To communicate between autonomous systems
5. What are interior routing protocols used for?
D. They are used within a single autonomous system.
6. Which of the following is a global task?
B. Enabling a routing protocol such as RIP or IGRP
7. What metric does RIP use to determine the best path for a message to travel on?
B. Hop count
8. You suspect that one of the routers connected to your network is sending bad
routing information. What command can you use to check?
C. router> show ip protocol
9. Why would you display the IP routing table?
B. To identify destination network addresses and next-hop pairs
10. If you want to learn which routing protocol a router was configured with, what
command structure should you use?
D. router> show ip protocol
11. In the following command, what does the last number stand for? Router
(config)# ip route 2.0.0.0 255.0.0.0 1.0.0.2 5
C. The administrative distance
12. An administrative distance of 15 indicates which of the following?
C. The routing information source is relatively trustworthy.
13. If you just added a new LAN to your internetwork and you want to manually
add the network to your routing table, what command structure would you use?
B. router (config)# ip route 2.0.0.0 255.0.0.0 1.0.0.2
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1038 Appendix C: Check Your Understanding Answer Key

Chapter 17
1. ICMP is an error-reporting protocol for IP. True or false?
A. True
2. ICMP stands for what?
D. Internet Control Message Protocol
3. ICMP messages are encapsulated as data in datagrams in the same way that any
other data is delivered using IP. True or false?
A. True
4. A default gateway must be configured if datagrams are to travel outside the local
network. True or false?
A. True
5. TTL stands for what?
B. Time-To-Live
6. All ICMP message formats start with which of these fields?
D. All of the above
7. Default gateways send ICMP redirects/change requests only when which of the
following conditions are met?
E. All of the above
8. The Type field on an ICMP timestamp message can be either a 13 (timestamp
request) or what?
A. 14 timestamp reply
9. All ICMP timestamp reply messages do not contain the originate, receive, and
transit timestamps. True or false?
B. False
10. What is ICMP type number for a router-solicitation message?
B. 10
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