IOS Questions

Question 1
Which command encrypts all plaintext passwords?
A. Router# service password-encryption
B. Router(config)# password-encryption
C. Router(config)# service password-encryption
D. Router# password-encryption

Question 2
What can be done to secure the virtual terminal interfaces on a router? (Choose two)
A. Administratively shut down the interface.
B. Physically secure the interface.
C. Create an access list and apply it to the virtual terminal interfaces with the access-group
command.
D. Configure a virtual terminal password and login process.
E. Enter an access list and apply it to the virtual terminal interfaces using the access-class command.

Question 3
Refer to the exhibit. Why is flash memory erased prior to upgrading the IOS image from the TFTP
server?

Router# copy tftp flash
Address or name of remote host []? 192.168.2.167
Source filename []? c1600-k8sy-mz.123-16a.bin
Destination filename [c1600-k8sy-mz.123-16a.bin]?
Accessing tftp://192.168.2.167/ c1600-k8sy-mz.l23-16a.bin…
Erasing flash before copying? [confirm]
Erasing the flash filesystem will remove all files! continue? [confirm]
Erasing device
Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
Eeeeeeeeeeeeeeeeeeeeeeeeeeeeeee …erased
Erase of flash: complete
Loading c1600-k8sy-mz.l23-16a.bin from 192.168.2.167 (via Ethernet0):
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
[OK – 6888962/13777920 bytes]
verifying checksum… OK (0x7BF3)
6888962 bytes copied in 209.920 secs (32961 bytes/sec)
Router#

A. The router cannot verify that the Cisco IOS image currently in flash is valid
B. Flash memory on Cisco routers can contain only a single IOS image.
C. Erasing current flash content is requested during the copy dialog.
D. In order for the router to use the new image as the default, it must be the only IOS image in flash.

Question 4
How does using the service password encryption command on a router provide additional security?
A. by encrypting all passwords passing through the router
B. by encrypting passwords in the plain text configuration file
C. by requiring entry of encrypted passwords for access to the device
D. by configuring an MD5 encrypted key to be used by routing protocols to validate routing
exchanges
E. by automatically suggesting encrypted passwords for use in configuring the router

Question 5
What is a global command?
A. a command that is available in every release of IOS, regardless of the version or deployment
status
B. a command that can be entered in any configuration mode
C. a command that is universal in application and supports all protocols
D. a command that is implemented in all foreign and domestic IOS versions
E. a command that is set once and affects the entire router

Question 6
Refer to the exhibit.

line vty 0 4
password 7 030752180599
login
transport input ssh

What is the effect of the configuration that is shown?
A. It configures SSH globally for all logins.
B. It tells the router or switch to try to establish an SSh connection first and if that foils to use Telnet.
C. It configures the virtual terminal lines with the password 030752180500.
D. It configures a Cisco network device to use the SSH protocol on incoming communications via
the virtual terminal ports.
E. It allows seven failed login attempts before the VTY lines are temporarily shutdown.

Question 7
Which router IOS commands can be used to troubleshoot LAN connectivity problems? (Choose
three)
A. ping
B. tracert
C. ipconfig
D. show ip route
E. winipcfg
F. show interfaces

Question 8
Which command shows your active Telnet connections?
A. show sessions
B. show cdp neighbors
C. show users
D. show queue

Question 9
Which command would you configure globally on a Cisco router that would allow you to view
directly connected Cisco devices?
A. enable cdp
B. cdp enable
C. cdp run
D. run cdp

Question 10
A network administrator needs to allow only one Telnet connection to a router. For anyone viewing
the confguration and issuing the show run command, the password for Telnet access should be
encrypted. Which set of commands will accomplish this task?
A. service password-encryption
access-list 1 permit 192.168.1.0 0.0.0.255
line vty 0 4
login
password cisco
access-class 1
B. enable password secret
line vty 0
login
password cisco
C. service password-encryption
line vty 1
login
password cisco
D. service password-encryption
line vty 0 4
login
password cisco

Question 11
What is the effect of using the service password-encryption command?
A. Only passwords configured after the command has been entered will be encrypted.
B. Only the enable password will be encrypted.
C. Only the enable secret password will be encrypted
D. It will encrypt the secret password and remove the enable secret password from the configuration.
E. It will encrypt all current and future passwords.

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OSI & TCP/IP Model

Question 1
Where does routing occur within the DoD TCP/IP reference model?
A. application
B. internet
C. network
D. transport

Question 2
Refer to exhibit.

Router#show running-config
Building configuration…
Current configuration : 659 bytes
!
version 12.4
no service timestamps log datetime msec
no service timestamps debug datetime msec
service password-encryption
!
hostname Router
!
enable secret 5 $1$mERr$hx5rVt7rPNoS4wqbXKX7m0
!
interface FastEthernet0/0
ip address 192.168.1.1 255.255.255.0
ip access-group 101 in
duplex auto
speed auto
!
access-1ist 101 deny tcp any any eq 22
access-1ist 101 permit ip any any
!
line con 0
password 7 0822455D0A16
login
line vty 0 4
login
line vty 5 14
login
!
end

A network administrator cannot establish a Telnet session with the indicated router. What is the
cause of this failure?
A. A Level 5 password is not set.
B. An ACL is blocking Telnet access.
C. The vty password is missing.
D. The console password is missing.

Question 3
Before installing a new, upgraded version of the IOS, what should be checked on the router, and
which command should be used to gather this information? (Choose two)
A. the amount of available ROM
B. the amount of available flash and RAM memory
C. the version of the bootstrap software present on the router
D. show version
E. show processes
F. show running-config

Question 4
Refer to the exhibit. An administrator pings the default gateway at 10.10.10.1 and sees the output as
shown. At which OSI layer is the problem?

C:\> ping 10.10.10.1
Pinging 10.10.10.1 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 10.10.10.1:
Packets: sent – 4, Received = 0, Lost – 4 (100% loss)

A. data link layer
B. application layer
C. access layer
D. session layer
E. network layer

Question 5
At which layer of the OSI model does PPP perform?
A. Layer 2
B. Layer 3
C. Layer 4
D. Layer 5

Question 6
Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two)
A. The transport layer divides a data stream into segments and may add reliability and flow control
information.
B. The data link layer adds physical source and destination addresses and an FCS to the segment.
C. Packets are created when the network layer encapsulates a frame with source and destination host
addresses and protocol-related control information.
D. Packets are created when the network layer adds Layer 3 addresses and control information to a
segment.
E. The presentation layer translates bits into voltages for transmission across the physical link.

Question 7
A network administrator is verifying the configuration of a newly installed host by establishing an
FTP connection to a remote server. What is the highest layer of the protocol stack that the network
administrator is using for this operation?
A. application
B. presentation
C. session
D. transport
E. internet
F. data link

Question 8
At which layer of the OSI model is RSTP used to prevent loops?
A. data link
B. network
C. physical
D. transport

Question 9
Which layer in the OSI reference model is responsible for determining the availability of the
receiving program and checking to see if enough resources exist for that communication?
A. transport
B. network
C. presentation
D. session
E. application

Question 10
A receiving host computes the checksum on a frame and determines that the frame is damaged. The
frame is then discarded. At which OSI layer did this happen?
A. session
B. network
C. physical
D. data link
E. transport

(Sưu tầm)

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Basic Questions

Question 1
What is the first 24 bits in a MAC address called?
A. NIC
B. BIA
C. OUI
D. VAI

Question 2
Which of the following statements describe the network shown in the graphic? (Choose two)

A. There are two broadcast domains in the network.
B. There are four broadcast domains in the network.
C. There are six broadcast domains in the network.
D. There are four collision domains in the network.
E. There are five collision domains in the network.
F. There are seven collision domains in the network

Question 3
Refer to the exhibit:

System flash director
File Length Name/status
1 3802992 c827v-y6-mz.121-1.XB
[3803056 bytes used,4585552 available, 8388608 total]
8192K bytes of processor board System flash(Read/Write)

The technician wants to upload a new IOS in the router while keeping the existing IOS. What is the
maximum size of an IOS file that could be loaded if the original IOS is also kept in flash?

A. 3MB
B. 5MB
C. 7MB
D. 4MB

Question 4
Refer to the exhibit. What is the meaning of the output MTU 1500 bytes?

A. The maximum number of bytes that can traverse this interface per second is 1500.
B. The minimum segment size that can traverse this interface is 1500 bytes.
C. The minimum segment size that can traverse this interface is 1500 bytes.
D. The minimum packet size that can traverse this interface is 1500 bytes.
E. The maximum packet size that can traverse this interface is 1500 bytes.
F. The maximum frame size that can traverse this interface is 1500 bytes.

Question 5
A network interface port has collision detection and carrier sensing enabled on a shared twisted pair
network. From this statement, what is known about the network interface port?

A. This is a 10 Mb/s switch port.
B. This is a 100 Mb/s switch port.
C. This is an Ethernet port operating at half duplex.
D. This is an Ethernet port operating at full duplex.
E. This is a port on a network interface card in a PC.

Question 6
In an Ethernet network, under what two scenarios can devices transmit? (Choose two)
A. when they receive a special token
B. when there is a carrier
C. when they detect no other devices are sending
D. when the medium is idle
E. when the server grants access

Question 7
For what two purposes does the Ethernet protocol use physical addresses? (Choose two)
A. to uniquely identify devices at Layer 2
B. to allow communication with devices on a different network
C. to differentiate a Layer 2 frame from a Layer 3 packet
D. to establish a priority system to determine which device gets to transmit first
E. to allow communication between different devices on the same network
F. to allow detection of a remote device when its physical address is unknown

Question 8
Which two locations can be configured as a source for the IOS image in the boot system command?
(Choose two)
A. RAM
B. NVRAM
C. flash memory
D. HTTP server
E. TFTP server
F. Telnet server

Question 9
What is the difference between a CSU/DSU and a modem?
A. A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog
signals from a router to a leased line.
B. A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital
signals from a router to a leased line.
C. A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog
signals from a router to a phone line.
D. A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital
signals from a router to a phone line.

Question 10
A Cisco router is booting and has just completed the POST process. It is now ready to find and load
an IOS image. What function does the router perform next?
A. It checks the configuration register
B. It attempts to boot from a TFTP server
C. It loads the first image file in flash memory
D. It inspects the configuration file in NVRAM for boot instructions

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Link CCNA 200-120

http://www.9tut.com/

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