Exam : 640-821 Introduction to Cisco Networking Technologies (INTRO) #1

Topic 1, Design and Support (26 questions)
Section 1: Use a subset of Cisco IOS commands to analyze and report network
problems. (11 questions)
QUESTION 1
Exhibit



The result of the show interfaces serial 0/0 command is displayed in the exhibit.
What command should be executed to make this interface operational?
A. Certkiller C(config-if)# enable
B. Certkiller C(config-if)# no keepalive
C. Certkiller C(config-if)# encapsulation ppp
D. Certkiller C(config-if)# no shutdown
E. Certkiller C(config-if)# clockrate 56000
F. Certkiller C(config-if)# line protocol up
Answer: D
Explanation:

no shutdown

Enable the interface and the configuration changes you have just made on the interface.

Serial0 is administratively down, line protocol is up.
The possible causes for this state are

• The serial interface has been disabled with the shutdown interface configuration command.
• Different interfaces on the router are using the same IP address.

The following are some steps you can take to isolate the problem:

• Use the show configuration privileged EXEC command to display the serial port configuration. If "shutdown" is displayed after "interface Serial0," use the no shutdown interface configuration command to enable the interface.
• Use the show interface privileged EXEC command to display the IP addresses for all router interfaces. Use the ip address interface configuration command to assign unique IP addresses to the router interfaces.

QUESTION 2
Which command will reinitialize the router and totally replace the running configuration with the
current startup configuration?
A. Certkiller B# reload
B. Certkiller B# copy tftp startup-config
C. Certkiller B# copy startup.-config running-config
D. Certkiller B# copy running-config flash
E. Certkiller B# setup
Answer: A
Explanation:
Enter the copy system:running-config nvram:startup-config command to save your configuration changes to
your startup configuration
so that they will not be lost if there is a system reload or power outage. For example:
Router# copy system:running-config nvram:startup-config
Building configuration...
It might take a minute or two to save the configuration. After the configuration has been saved, the following
output appears:
[OK]
Router#
On most platforms, this task saves the configuration to NVRAM. On the Class A Flash file system platforms,
this task saves the
configuration to the location specified by the CONFIG_FILE environment variable. The CONFIG_FILE
variable defaults to NVRAM.
QUESTION 3
Which is the correct fallback sequence for loading the Cisco IOS?
A. ROM, Flash, NVRAM
B. ROM, TFTP server, Flash
C. Flash, TFTP server ROM
D. Flash NVRAM, RAM
Answer: C
QUESTION 4
Study the Exhibit below carefully:

z
A new router has been installed in the branch office in Lisbon. However, the network administrator
cannot make a backup of the IOS image of the new route to the TFTP server located in the Gibraltar
office. Following the network diagram, can you identify the cause of the problem?
A. IP address if the TFTP server not correct.
B. Incorrect subnet mask of the TFTP server.
C. Default gateway of the TFTP server not properly set.
D. Subnet mask on the Lisbon router not correct
E. Incorrect IP address configured on E0 of the Gibraltar router
Answer: B
Explanation:
An incorrect subnet mask on the TFTP server is the cause of this problem. If you look at the subnet masks of all
the other devices you'll notice that they are /28. If you rewrite the subnet mask of the TFTP server, of
255.255.255.192 you'll notice that it translates to a subnet mask of /26. A subnet mask of 255.255.255.240,
which is a /28, applied to the TFTP server will fix this problem.
QUESTION 5
You are the network administrator at Certkiller . Certkiller users report that they cannot access resources
on the LAN attached to interface e0 of router CK1 . You want to view the current IP addressing and the
Layer 1 and Layer 2 status of this interface.
Which of the following commands could you use? (Choose three.)
A. CK1 # show version
B. CK1 # show protocols
C. CK1 # show interfaces
D. CK1 # show controllers
E. CK1 # show ip interface
F. CK1 # show startup-config
Answer: C, D, E
Explanation:
show interfaces is used to see the IP addresses and layer 2 information configured on the interfaces.
show controllers is used to see the layer 1 statistics. It tells about the V.35 cables whether they are physically
attached or not.
show ip interfaces is used to see the IP addresses configured on the interfaces.
QUESTION 6
You are a network technician at Certkiller . You are troubleshooting a LAN connectivity problem.
Which of the following router IOS commands could you use? (Select three options.)
A. show ip route
B. winipcfg
C. tracert
D. show interfaces
E. traceroute
F. ping
Answer: A D F
Explanation
A: The show ip route command displays the IP route table.
D: The show interfaces EXEC command to display statistics for all interfaces configured on the router or
access server.
F: The ping command tests connectivity to a remote node.
QUESTION 7
You are a technician at Certkiller . Your newly appointed Certkiller trainee wants to know what command
she can use to verify the active configuration on a Cisco router.
What would your reply be?
A. Router# show memory
B. Router# show startup-config
C. Router# show running-config
D. Router# show flash
Answer: C
Explanation:
The two commands that list the currently used configuration in a router is reloaded are show running-config
and write terminal.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 494
QUESTION 8
You are a technician at Certkiller . Your newly appointed Certkiller trainee is troubleshooting a
connectivity problem on the Certkiller network. She asks you what command she should use to test
application layer connectivity the between source and destination.
What would your reply be?
A. ping
B. telnet
C. traceroute
D. verify
E. trace
Answer: B
Explanation:
Telnet - The standard terminal emulation protocol in the TCP/IP protocol stack. Telnet is used for remote
terminal connection, enabling users to log in to remote systems and use resources as if they were connected to a
local system.
I was going to choose answer A (ping), but the keyword in the question is "application layer". Ping only needs
to hit the NIC and that would mean layer 1 (Physical layer).
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) page 589
QUESTION 9
You are the network administrator at Certkiller . Your assistant made a number of errors when utilizing
the router setup mode facility. You want to exit setup mode without applying the changes that your
assistant made.
What should you do? (Select two.)
A. Type exit at the setup dialog.
B. Type close at the setup dialog.
C. Press the Ctrl-C key combination.
D. Press the Ctrl-X key combination.
E. Issue the copy startup-config command.
F. Issue the 'write e" command.
G. Issue the "write mem" command
Answer: A, C
Explanation:
The command 'exit' will set you back from wherever you were without saving any changes. Pressing Ctrl-C
will do the same thing.
Incorrect Answers:
B. This is an invalid command
E. This command is used to save the configuration stored on NVRAM to a location.
F. This will have the effect of erasing the running configuration, and setting the router configuration back to the
factory default settings.
G. This is an old command that is still supported on the latest Cisco IOS. It is short for "write memory" and
has the same effect as the "copy running-config startup-config" command
QUESTION 10
With regard to bandwidth, which of the following statements are true? (Choose all that apply.)
A. Bandwidth availability is decreasing.
B. Bandwidth availability is infinite.
C. Bandwidth is used when analyzing network performance.
D. Bandwidth availability is finite.
E. Bandwidth availability is fixed.
Answer: C, D
Explanation: C is correct because performance analyzing software is notorious for consuming bandwidth.
Most network management devices use SNMP, which consumes bandwidth. D is correct because although new
technologies are providing for more bandwidth and a network can be engineered to give more priority to
different devices, there is a finite amount of bandwidth available at any given time.
Incorrect Answers:
A. This is incorrect because new technologies are actually increasing the amount of potential bandwidth.
B. For any given network, the amount of bandwidth available to end users is usually fixed, and based on the
speed of the connection to access connection. For example, any given PC with a 10/100 NIC will be limited to
100Mbps of throughput at any given time.
E. This is incorrect because it's always possible to upgrade a scalable technology or allocate resources
differently.
QUESTION 11
You are the network administrator at Certkiller . From your workstation you telnet to a router VTY line.
You perform a number of configurations on the router. You now want to terminate the telnet connection.
What command must you issue to terminate the Telnet connection?
A. close
B. disable
C. disconnect
D. suspend
E. exit
Answer: C
Explanation:
Terminating a Telnet session
Use the disconnect from the router you Telnetted from.
Reference:
CCNA Self-Study CCNA INTRO exam certification Guide (Cisco Press, ISBN 1-58720-094-5) Page 398