CCNA Guide to Cisco Networking, Third Edition
Chapter 7 Lab Solutions
Chapter 7 Lab Solutions
Instructor Tips Lab 7.1
Continue using the lab teams for these labs. It is preferable for the labs in this chapter to
be done in one sitting, as the configurations are not saved.
It is important to make sure students do the Chapter 6 labs correctly before going on to
the Chapter 7 labs. If you want to be sure the routers are set up correctly for the Chapter
7 labs, you can use the erase start command to erase their Chapter 6 work, and then
reload and paste in the included instructor files. The file for the lab-a router is named
“lab-a-after6.txt”. It is a good idea to put these files on the hard drives of the computers
attached to the routers. I put them in MY DOCUMENTS in a folder named CISCO.
Activity Questions Lab 7.1
5. Global configuration mode.
9. You can refer to routers by name in commands.
10. Should know about all routers since the students should have just configured the ip
host command for each.
12. Interface configuration mode; only this interface.
14. Puts an IP address on the interface.
15. Tells the router to attempt to keep this interface in up/up state.
Review Questions Lab 7.1
1. What mode must you be in to configure IP addresses on a Cisco router?
Interface configuration mode.
2. What is the purpose of a host name table?
To allow you to use names in commands rather than IP addresses when
referring to other routers.
3. What is the command to point to another router or server for host name resolution?
ip name-server [ip address of router or server with host name table].
4. What is the clock rate command used for?
One end of a WAN link must do the timing (clocking) function. It is usually
done by telco equipment such as a CSU/DSU. In the lab setup, there is no telco
equipment, so one end of each serial link must do the clocking. The S0
interface was chosen arbitrarily to handle this. The clock rate command is the
timing command.
5. What does the no shutdown command do?
The no shutdown command tells the router to attempt to bring up a router
interface if it goes down.
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CCNA Guide to Cisco Networking, Third Edition
Chapter 7 Lab Solutions
Instructor Tips Lab 7.2
Cisco’s TFTP server software is included with the instructor files. It is a single file named
tftpserv.exe. Put it on a diskette and make additional diskettes. Provide a diskette to
each lab team before doing this lab.
Each team member does not install the TFTP server. This lab is done as a team. Some
team members can make the physical connections, while others configure the software.
All students will back up their configuration files to the TFTP server, but only the student
configuring the lab-e router should back up the IOS file (in Step 27), as this takes
significantly longer and all IOS files are probably the same. Have the rest of the team
watch the process.
Activity Questions Lab 7.2
21. show run
26. Answer varies, but an example would be c2500-d-l.120-4.t (Note that the character
after the d- is a lower case “L”. The next character after the period is a number one.)
Review Questions Lab 7.2
1. What is the purpose of a TFTP server?
Use it to back up configuration and IOS files. You can also configure the
routers to boot the IOS automatically from the TFTP server.
2. What is the purpose of a default gateway?
If hosts want to access networks other than their local network, a default
gateway must be configured on the host. It is the interface leading out of the
local network.
3. What prompt and command are used to copy the active configuration to a TFTP
server?
enable mode; copy run tftp
4. What prompt and command are used to copy the IOS to a TFTP server?
enable mode; copy flash tftp
5. List two show commands that display the IOS image filename.
show version; show flash
Activity Questions Lab 7.3
6. Enter TEXT message. End with the character ‘#’.
19. Hopefully yes.
Review Questions Lab 7.3
1. What is the purpose of the banner command?
To provide a message to router users when the router boots.
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CCNA Guide to Cisco Networking, Third Edition
Chapter 7 Lab Solutions
2. What does MOTD stand for?
Message of the day
3. What is the purpose of the description command?
To provide a description of what the router interface is connected to.
4. What mode must you be in to configure a banner?
Global configuration mode
5. What mode must you be in to configure a description?
Interface configuration mode
Instructor Tips Lab 7.4
In this lab, the students will be telnetting to each other’s routers. There will be an
overwhelming temptation for many to mess around. You may want to warn them not to
reconfigure their teammates’ routers.
Activity Questions Lab 7.4
5. Answer varies; answer varies; router; platform and remote port.
6. IP address plus IOS version
7. 60 seconds
9. Hopefully yes
11. Disables cdp on the e0 interface.
12. Hopefully yes; E0 interface is not listed in the show command output.
14. Hopefully yes
16. Hopefully yes; series of exclamation points; answer varies.
17. Prompts you for protocol type.
18. It is customized to have a longer repeat count and bigger datagram.
20. Hopefully yes; hop information along the path to the destination; indicates where
there is a breakdown of communications.
21. Network (3)
22. Internetwork (2)
23. ICMP
24. The name table; Hopefully yes.
26. Not exactly; it is a vty line password.
29. The running configuration of the remote router.
30. You can visualize the entire internetwork by telnetting to each router and using the
show cdp neigh command.
31. Application (7)
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CCNA Guide to Cisco Networking, Third Edition
Chapter 7 Lab Solutions
32. Application (4)
33. Higher level connectivity and can control router remotely
Review Questions Lab 7.4
1. What is the purpose of the CDP protocol?
To advertise Cisco router and switch information to neighbors.
2. Is CDP enabled by default on all Cisco routers?
Yes.
3. What is the difference between ping and extended mode ping?
Ping defaults to IP with a repeat count of 5 and other preset parameters.
Extended mode ping allows you to manipulate these parameters.
4. What mode and command are used to disable CDP on an interface?
Interface configuration mode; no cdp enable
5. What mode and command are used to disable CDP on the entire router?
Global configuration mode; no cdp run
Activity Questions Lab 7.5
7. show run
19. Erases the startup configuration file in NVRAM.
30. Hopefully yes
31. Answer varies but they will probably all be administratively down.
Review Questions Lab 7.5
1. Why is it a good idea to save your router configuration files to a hard drive or
diskette?
It is easy to load the configurations into the router. You don’t need
connectivity to a TFTP server.
2. Where does the startup configuration live and how do you erase it?
NVRAM; erase start
3. What do you think would happen if you used the erase flash command? (Note that
this question is for discussion purposes only. Do not use this command.)
You will erase flash memory and the IOS.
4. What should you try if your interfaces administratively go down?
Use the no shutdown command in interface configuration mode.
5. How can you erase the running configuration?
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CCNA Guide to Cisco Networking, Third Edition
Chapter 7 Lab Solutions
There is no command that will erase the running configuration. You must
erase start, and then reload.
Instructor Tips Lab 7.6
Only the person configuring the lab-e router will do Steps 9 through 19, which will
configure the lab-e router to boot from the TFTP server using the IOS that was
previously copied to the server. The other team members should observe the process.
All students will continue configuring their routers in Step 20.
You may have a problem with the boot system command part of this lab. The student is
instructed to load an IOS into flash from the TFTP server. Unless there is sufficient flash
memory in the router, there won’t be room for this additional copy of the IOS in flash.
The process will begin as it should but halfway through the loading, students may see a
“buffer overflow” error. It won’t matter, the router will just continue to load the IOS, but
from the flash, not from the TFTP server. Even without enough memory, the exercise is
important and worth doing. You can make the lab work in all cases but it will require
erasing the flash first. I do not recommend erasing the flash unless you are a very
experienced instructor. You can also choose not to do this part of the lab. There should
be no problem with the configuration register part of this lab.
Activity Questions Lab 7.6
7. Answer varies; answer varies but is probably something like 0x2102 (last character
will probably be a “2”); flash unless there are boot system commands to the contrary.
13. The configuration register setting.
23. ROM
24. >
27. Hopefully yes
Review Questions Lab 7.6
1. What are two ways to control the boot procedure for loading the IOS?
Put boot system commands in the configuration file; change the configuration
register setting.
2. What would happen during bootup if the configuration register were set to 0x2101?
You would boot the router into RxBoot mode, which is another mode in ROM.
3. Why might you want to use a series of boot system commands in your configuration?
To control where the IOS boots from; to provide backup boot procedures for
loading in case it doesn’t work.
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