Dich giup bai CCNA

[giun7288]

Wednesday, July 22, 2009

100/100

1 A PC can not connect to any remote websites, ping its default gateway, or ping a printer that is functioning properly on the local network segment. Which action will verify that the TCP/IP stack is functioning correctly on this PC?

Use the ipconfig /all command at the host�s command prompt.
X Use the ping 127.0.0.1 command at the command prompt.
Use the traceroute command at the command prompt to identify any failures on the path to the gateway.
Use FTP to check for connectivity to remote sites.
Download a troubleshooting tool from the PC manufacturer's website.


2 Refer to the exhibit. Which set of devices contains only intermediary devices?

X A, B, D, G
A, B, E, F
C, D, G, I
G, H, I, J


3 Refer to the exhibit. When computer A sends a frame to computer D, what computers receive the frame?

X only computer D
only computer A and computer D
only computer B, computer C, and computer D
all computers


4 Which password is automatically encrypted when it is created?

vty
aux
console
X enable secret
enable password


5 Which three statements characterize the transport layer protocols? (Choose three.)

X TCP and UDP port numbers are used by application layer protocols.
TCP uses port numbers to provide reliable transportation of IP packets.
UDP uses windowing and acknowledgments for reliable transfer of data.
X TCP uses windowing and sequencing to provide reliable transfer of data.
X TCP is a connection-oriented protocol. UDP is a connectionless protocol.


6 Which type of media is immune to EMI and RFI? (Choose two.)

10 Base-T
10 Base-2
10 Base-5
X 100 Base-FX
100 Base TX
X 1000 Base LX


7 Refer to the exhibit. A technician is working on a network problem that requires verification of the router LAN interface. What address should be pinged from this host to confirm that the router interface is operational?

127.0.0.1
192.168.64.196
X 192.168.254.1
192.168.254.9
192.168.254.254


8 Refer to the exhibit. The diagram represents the process of sending email between clients. Select the list below that correctly identifies the component or protocol used at each numbered stage of the diagram.

1.MUA 2.MDA 3.MTA 4.SMTP 5.MTA 6.POP 7.MDA 8.MUA
1.MUA 2.POP 3.MDA 4.SMTP 5.MTA 6.MDA 7.SMTP 8.MUA
1.MUA 2.POP 3.SMTP 4.MDA 5.MTA 6.SMTP 7.POP 8.MUA
1.MDA 2.SMTP 3.MTA 4.SMTP 5.MTA 6.MUA 7.POP 8.MDA
X 1.MUA 2.SMTP 3.MTA 4.SMTP 5.MTA 6.MDA 7.POP 8.MUA


9 Refer to the exhibit. What function does router RT_A need to provide to allow Internet access for hosts in this network?

X address translation
DHCP services
ftpd
web server


10 Refer to the exhibit. The network containing router B is experiencing problems. A network associate has isolated the issue in this network to router B? What action can be preformed to correct the network issue?

issue the ip address command on interface FastEthernet 0/0
X issue the no shutdown command on interface FastEthernet 0/1
issue the clock rate command on interface Serial 0/0/0
issue the description command on interface Serial 0/0/1


11 Which three IPv4 addresses represent a broadcast for a subnet? (Choose three.)

X 172.16.4.63 /26
172.16.4.129 /26
X 172.16.4.191 /26
172.16.4.51 /27
X 172.16.4.95 /27
172.16.4.221 /27


12 What are three characteristics of CSMA/CD? (Choose three.)

Devices can be configured with a higher transmission priority.
A jam signal indicates that the collision has cleared and the media is not busy.
X A device listens and waits until the media is not busy before transmitting.
The device with the electronic token is the only one that can transmit after a collision.
X All of the devices on a segment see data that passes on the network medium.
X After detecting a collision, hosts can attempt to resume transmission after a random time delay has expired.


13 In a Cisco IOS device, where is the startup-configuration file stored?

Flash
X NVRAM
RAM
ROM


14 A routing issue has occurred in you internetwork. Which of the following type of devices should be examined to isolate this error?

access point
host
hub
X router
switch


15 Which OSI layer protocol does IP rely on to determine whether packets have been lost and to request retransmission?

application
presentation
session
X transport


16 Due to a security violation, the router passwords must be changed. What information can be learned from the following configuration entries? (Choose two.)

Router(config)# line vty 0 3
Router(config-line)# password c13c0
Router(config-line)# login

The entries specify three Telnet lines for remote access.
X The entries specify four Telnet lines for remote access.
The entries set the console and Telnet password to "c13c0".
Telnet access will be denied because the Telnet configuration is incomplete.
X Access will be permitted for Telnet using "c13c0" as the password.


17 Which prompt represents the appropriate mode used for the copy running-config startup-config command ?

Switch-6J>
X Switch-6J#
Switch-6J(config)#
Switch-6J(config-if)#
Switch-6J(config-line)#


18 Which combination of network id and subnet mask correctly identifies all IP addresses from 172.16.128.0 through 172.16.159.255?

172.16.128.0 255.255.255.224
172.16.128.0 255.255.0.0
172.16.128.0 255.255.192.0
X 172.16.128.0 255.255.224.0
172.16.128.0 255.255.255.192


19 When must a router serial interface be configured with the clock rate command?

when the interface is functioning as a DTE device
when the interface timers have been cleared
when the connected DTE device is shut down
X when the interface is functioning as a DCE device


20 When connectionless protocols are implemented at the lower layers of the OSI model, what are usually used to acknowledge the data receipt and request the retransmission of missing data?

connectionless acknowledgements
X upper-layer connection-oriented protocols
Network layer IP protocols
Transport layer UDP protocols


21 A technician is asked to secure the privileged EXEC mode of a switch by requiring a password. Which type of password would require this login and be considered the most secure?

console
enable
X enable secret
VTY


22 Refer to the exhibit. What is required on host A for a network technician to create the initial configuration on RouterA?

a FTP client
a telnet client
X a terminal emulation program
a web browser


23 Refer to the exhibit. A network administrator remotely accesses the CLI of RouterB from PC1. Which two statements are true about the application layer protocol that is used to make this connection? (Choose two.)

The data is encrypted.
X The connection type is called a VTY session.
A server process is running on PC1.
A GET request is sent to RouterB.
X The application name is the same for the service, protocol, and client.


24 The Layer 4 header contains which type of information to aid in the delivery of data?

X service port number
host logical address
device physical address
virtual connection identifier


25 Refer to the exhibit. What two facts can be determined about the exhibited topology? (Choose two.)

X A single broadcast domain is present
Two logical address ranges are required.
Three broadcast domains are shown.
Four networks are needed.
X Five collision domains exist.