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Thảo luận các câu hỏi CCNA

[Question] Thảo luận các câu hỏi CCNA	28/07/2006 05:41:53 (+0700) \| #1 \| 10472

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

Mình sắp thi CCNA, mời mọi người vào thảo luận.
Tập hợp từ các nguồn VNPRO,NHATNGHE,TESTKING,NET130....

1.Which statement describes the routing protocol OSPF (choose 3)

A.It supports VLSM
B.It is used to between Autonomous systems
C.It confines network instability to one area of network
D.It increases routing overhead over the network
E.It allows extensive control of the routing update
F.it is simpler to configure than RIPv2

2. Error detection schemes use which field of frame to detect error?

A.MTU
B.MAC
C.FCS
D.PDU
E.ERR
F. Flag

3. Which of the following are characteristics of microsegmentation? (Choose two)

A. Dedicated paths between sending and receiving host are established
B. the number of collision domains is decreased
C. Broadcast domain are enlarged
D. Multiple subnetwork broadcast addresses are created
E. Multiple ARP tables are required on the connected hosts
F. Bandwidth is dedicated to connect hosts

4. Which statement describes the rule of split horizon?

A. Only routers can split boundaries (horizons) between concentric networks.
B. All distance vector protocols require fall back routers that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routers is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update come.
E. Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.

5. A network host is configured as follows: Host IP address: 192.168.16.183 Subnet mask:255.255.255.224 Default gateway: 192.168.16.190. Which of the following statements describe the network to which this host is attached? (Choose three)

A. The default gateway is configured on a different subnet form this host.
B. The host is a member of the fifth usable subnet of the 192.168.16.0 network.
C. The sub network address for this host is 192.168.16.160/28.
D. The address of the next higher subnet is 192.168.16.192.
E. The address of the router interface that is attached to this sub network is 192.168.16.190.
F. There are 60 usable host addresses on this subnet.

6. You have configured a new Frame Relay link on a router that is using IGRP.
Which command would you use to set the IGRP metric for the speed of this link?

A. Contoso Router(config)# IGRP metric 256K
B. Contoso Router(config)# bandwidth 256
C. Contoso Router(config-if)# metric 256K
D. Contoso Router(config-if)# bandwidth 256

7. 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 version.
E. A command that is set once and affects the entire router.

8. An administrator has decided to use the private address 172.20.0.0 for the internal network. If the maximum number of hosts allowed on a subnet is 62, which of the following is true regarding the addressing scheme?

A. 172.20.62.255 is a host address.
B. Ten bits were borrowed for subnets.
C. 255.255.255.252 is the subnet mask.
D. 172.20.255.64 is a subnet address.
E. Seven host bits must be used to meet the addressing scheme requirement.

9. What feature of a networks switch allows an administrative to create separate broadcast domains?

A. Store-and-forward switching
B. Micro segmentation
C. Transparent bridging
D. Fragment-free switching
E. Virtual LANs
F. Cut-through switching

10. Which of the following options lists the steps in PPP session establishment in the correct order?

A. Optional authentication phase, link establishment phase, network layer protocol phase.
B. Network layer protocol phase, link establishment phase, optional authentication phase.
C. Network layer protocol phase, optional authentication phase, link establishment phase.
D. Link establishment phase, network layer protocol phase, optional authentication phase.
E. Link establishment phase, optional authentication phase, network layer protocol phase.
F. Optional authentication phase, network layer protocol phase, link establishment phase.

11. Which Frame Relay feature is responsible for transmitting keep alive to ensure that the PVC does not shut down because of inactivity?

A. DLCI
B. BECN
C. FECN
D. LMI
E. CIR
F. DE

12. Which characteristics are representative of a link-state routing protocol? (Choose three)

A. Provide common view of entire topology
B. Exchange routing tables with neighbors.
C. Calculates shortest path.
D. Utilizes event triggered updates.
E. Utilizes frequent periodic updates.

13. Which of the following contribute to congestion on an Ethernet network. (Choose two)

A. Use of full duplex mode.
B. Creation of new collision domain.
C. Creation of new broadcast domain.
D. Addition of hub to the network.
E. Use of switches in the network.
F. Amount of ARP or IPX SAP traffic.

14. Exhibit:

Which of the following is the minimum configuration commands required to bring up the ISDN link shown in graphic. Note : SPIDs are not required for this switch. (Choose three)

A. Router(Config-if)# encapsulation PPP
B. Router(Config-if)# isdn switch-type type
C. Router(Config-if)# dialer-list, protocol ip permit
D. Router(Config-if)# dialer map ip address name name connection number.
E. Router(Config-if)# ip address subnet mask
F. Router(Config-if)# dialer group 1

15. The command frame - relay map ip 10.121.16.8.102 broadcast was entered on the router. Which of the following statement is true concerning this command?

A. This command should be executed from the global configuration mode.
B. The IP address 10.121.16.8 is the local router part used to forward data
C. 102 is the remote DLCI that will receive the information.
D. Command is required for all frame relay configuration.
E. The broadcast option allows packet, such as RIP update, to be forwarded across the PVC.

16. Exhibit:

MTU 1500 bytes, Bw 10000 Kbit, Dly 1000 Usec.reliability 128/255, txload 1/255, rxload 1/255Encapsulation Arpa, loop back not seCKeepalive set (10 Sec)ARP type: Arpa, Arp Timeout 04:00:00Last Input 21:24:36, output 00:00:08, output hang never last clearing of "show interface" countees never Queuing strategy: FIFO Output queue 0/40, 0 drops; input queue 0/75: drops5 min input rate 0 bits/sec, 0 packets/sec 5 min output rate 0 bits/sec, packets/sec75427 packet input, 10685636 bytes, 0 buffer Received 75427 broadcast, 933 runts, 253 giants, 0 throttles0 input error, 0 cvc, 0 frame. 0 overrun, 0 ignored0 input packet with dribble condition detected78387 packet output, 7329230 bytes, 0 under nuns.

During routine network maintenance, a technician issues the show interface E0 command. A partial output of the command is shown in exhibit which values displayed in the command output could indicate that collisions have occurred (Choose two)

A. MTV 1500 bytes
B. Reliability 128/255
C. 933 runts
D. 75427 broadcasts
E. 78387 packets output
F. 253 giants

17. Exhibit:

Given the topology as illustrated, what commands are needed to configure IGRP on the Contoso1 Router? (Choose three)

A. Contoso1 (config ) # Router IGRP 100
B. Contoso1 (config) # router IGRP
C. Contoso1 (config - router) # network 192.168.6.0
D. Contoso1 (config - router) # network 192.168.7.0
E. Contoso1 (config - router) # network 192.168.8.0
F. Contoso1 (config - router) # network 192.168.9.0

18. Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two)

A. Transport layer divides a data stream into segments & adds reliability & flow control information
B. Data link layer adds physical source & destination address & an FCS to the segment
C. Packets are created when the network layer encapsulate a frame with source & destination host address & protocol related control information
D. Packets are created when the network layers adds layers 3 address & control information to a segment
E. The presentation layer translated bits into bits into voltages for transmission across the physical link

19. Exhibit:

After Configuring the router show in the exhibit, the from the technician's laptop to all of the interface on each router were successful, if a technician initiates a telnet session to Router Contoso1 and issues the show arp command, which of the following items will be among the entries displayed in the output?

A. The MAC address of the S0 interface on Router Contoso1
B. The MAC address of the E0 interface on Router Contoso1
C. The MAC address of the S0 interface on Router Contoso2
D. The MAC address of the E0 interface on Router Contoso2

20. Exhibit:

Given a Network with a switched topology as illustrated. What will be the result if the Spanning-Tree Protocol is disabled on all the switches? (Choose two)

A. Broadcast Storm will occur.
B. Broadcast Storm will be detected quickly.
C. At least one link will be placed in standby.
D. Loops will occur.
E. Loops will be detected quickly.

21. The Frame relay circuit between Contoso1 & Contoso2 is experiencing congestion. Which type of notification are used to alleviate the congestion? (Choose three)

A. FECN
B. CIR
C. BECN
D. DE
E. DLCI 100 is Down

22. What does a configuration Register Setting of 0x2105 indicate to the Router?

A. The Boot IOS Code is Located in the NVRAM.
B. Check NVRAM for boot system Commands.
C. Bypass NVRAM Configurations.
D. Boot the IOS Code Located in ROM.
E. Perform a Password Recovery.
F. Bypass The Code In ROM.

23. All WAN links is side the Contoso.com network use PPP with for authentication security. Which command will display the CHAP authentication process as it occurs between two routers in the network.

A. show CHAP authentication
B. show interface serial 0
C. debug PPP authentication
D. debug CHAP authentication
E. show PPP authentication CHAP
24. Which of the following if addresses can be assigned to host devices (Choose two)

A. 205.7.8. 32/27
B. 191.168. 10. 2/23
C. 127.0.0.1
D. 224.0.0.10
E. 203.123.45. 47/28
F. 10.10.0.0/13

25. How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of /26?

A. 64 network and 4 hosts
B. 4 network and 64 hosts
C. 2 network and 62 hosts
D. 62 network and 2 hosts

It's time to build a new network.

[Question] Thảo luận các câu hỏi CCNA	28/07/2006 11:46:13 (+0700) \| #2 \| 10548

Mulan
HVA Friend

Joined: 01/02/2002 15:09:07
Messages: 274
Location: 127.0.0.1
Offline

Đây là thảo luận hay hỏi?

[Question] Re: Thảo luận các câu hỏi CCNA	28/07/2006 18:29:21 (+0700) \| #3 \| 10588

conmale
Administrator

Joined: 07/05/2004 23:43:15
Messages: 9353
Location: down under
Offline

Em tự trả lời xem smilie

). Có sai, anh em góp ý cho.

What bringing us together is stronger than what pulling us apart.

[Question] Re: Thảo luận các câu hỏi CCNA	29/07/2006 00:19:45 (+0700) \| #4 \| 10687

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

2. Error detection schemes use which field of frame to detect error?

A.MTU
B.MAC
C.FCS
D.PDU
E.ERR
F. Flag

Câu này thì tương đối dễ, đáp án đúng là FCS, trường FCS có 16 bit dùng để kiểm tra frame có bị lỗi hay không? Nó dùng thuật toán hàng & cột để kiểm tra. Nó chỉ phát hiện lỗi chứ không sửa lỗi.

25. How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of /26?

A. 64 network and 4 hosts
B. 4 network and 64 hosts
C. 2 network and 62 hosts
D. 62 network and 2 hosts

Câu này thì đáp án đúng là câu :B
Vì nó có các subnet như sau :201.105.13.0/26 và 201.105.13.64/26,201.105.13.128/26 và 201.105.13.192/26

23. All WAN links is side the Contoso.com network use PPP with for authentication security. Which command will display the CHAP authentication process as it occurs between two routers in the network.

A. show CHAP authentication
B. show interface serial 0
C. debug PPP authentication
D. debug CHAP authentication
E. show PPP authentication CHAP

Đáp án là : debug ppp authentication

20. Exhibit:

Given a Network with a switched topology as illustrated. What will be the result if the Spanning-Tree Protocol is disabled on all the switches? (Choose two)

A. Broadcast Storm will occur.
B. Broadcast Storm will be detected quickly.
C. At least one link will be placed in standby.
D. Loops will occur.
E. Loops will be detected quickly.

Hình như câu này có hình, đáp án đúng là: A và D
Vì khi protocol Spaning-tree bị disable thì quá trình loop sẽ xảy ra và kết quả là bị "bão" Broadcast và Loop xảy ra.

Không biết đúng không các huynh. :? smilie

19. Exhibit:

After Configuring the router show in the exhibit, the from the technician's laptop to all of the interface on each router were successful, if a technician initiates a telnet session to Router Contoso1 and issues the show arp command, which of the following items will be among the entries displayed in the output?

A. The MAC address of the S0 interface on Router Contoso1
B. The MAC address of the E0 interface on Router Contoso1
C. The MAC address of the S0 interface on Router Contoso2
D. The MAC address of the E0 interface on Router Contoso2

Câu này cũng có hình, đáp án đúng là MAC của Interface gần host nhất .

24. Which of the following if addresses can be assigned to host devices (Choose two)

A. 205.7.8. 32/27
B. 191.168. 10. 2/23
C. 127.0.0.1
D. 224.0.0.10
E. 203.123.45. 47/28
F. 10.10.0.0/13

Câu này cũng có hình chỉ loại bỏ được các câu sau :
C. 127.0.0.1 đây là địa chỉ loopback .
D. 224.0.0.10 đây là địa chỉ Multicast
A. 205.7.8. 32/27 là địa chỉ SubNET
B. 191.168. 10. 2/23 này là Broadcast.
nên câu trả lời đúng là :E và F

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	29/07/2006 02:20:58 (+0700) \| #5 \| 10713

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

18. Which of the following correctly describe steps in the OSI data encapsulation process? (Choose two)

A. Transport layer divides a data stream into segments & adds reliability & flow control information
B. Data link layer adds physical source & destination address & an FCS to the segment
C. Packets are created when the network layer encapsulate a frame with source & destination host address & protocol related control information
D. Packets are created when the network layers adds layers 3 address & control information to a segment
E. The presentation layer translated bits into bits into voltages for transmission across the physical link

Theo em câu D là câu trả lời đúng, không biết anh nào có ý kiến gì không ?

12. Which characteristics are representative of a link-state routing protocol? (Choose three)

A. Provide common view of entire topology
B. Exchange routing tables with neighbors.
C. Calculates shortest path.
D. Utilizes event triggered updates.
E. Utilizes frequent periodic updates.

CÂu này các câu đúng là : C&D&E
Vỉ giao thức định tuyến link-state không trao đổi bảng routing mà chỉ thay đổi database cho nhau, nó cũng dùng các HELLO packet để thông báo cho nhau trong thời gian định kì là 5s.

10. Which of the following options lists the steps in PPP session establishment in the correct order?

A. Optional authentication phase, link establishment phase, network layer protocol phase.
B. Network layer protocol phase, link establishment phase, optional authentication phase.
C. Network layer protocol phase, optional authentication phase, link establishment phase.
D. Link establishment phase, network layer protocol phase, optional authentication phase.
E. Link establishment phase, optional authentication phase, network layer protocol phase.
F. Optional authentication phase, network layer protocol phase, link establishment phase.

Theo em thì câu D là câu trả lời đúng vì khi 1 session ppp được thiết lập thì quá trình đầu tiên là LCP sẽ kết nối đến IPCP kết nối sau đó mới chứng thực username & password.

9. What feature of a networks switch allows an administrative to create separate broadcast domains?

A. Store-and-forward switching
B. Micro segmentation
C. Transparent bridging
D. Fragment-free switching
E. Virtual LANs
F. Cut-through switching

Câu này thì em không chắc có trả lời đúng không ? Có lẽ câu B là đúng vì các broadcast domain sẽ được chia ra bởi các segment nhỏ. :? smilie

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	29/07/2006 02:24:05 (+0700) \| #6 \| 10716

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

Trong khi thảo luận các câu hỏi trên em tiếp tục làm các câu dễ trong phần dưới sau

26. A Router with a BRI/T interface will be used for an ISDN Connection what other ISDN device is required to complete this connection?

A. TE1
B. TE2
C. NT1
D. NT2

27. Contoso.com has allocated the IP add 199.144.27.0 is its network, to provide flexibility for the LAN design, a subnet mask of 255.255.255.240 has been chosen. Which of the following address can be assigned to LAN on the resulting subnets (Choose three)

A. 199.141.27.33
B. 199.141.27.112
C. 199.141.27.119
D. 199.141.27.126
E. 199.141.27.175
F. 199.141.27.208

28. You are configuring a new Catalyst switch that you want to manage remotely from workstations on other network segments within your enterprise. Which of the following are required to allow remote management of the switch over IP? (Choose two)

A. The switch name must match the workgroup name of the local network.
B. The switch must be configured with an IP address and default gateway.
C. The remote workstations must have access to the management VLAN of the switch.
D. CDP must be enabled on the switch so that it can be located by other devices on the network.

29. Which command is used to display the placement and direction of an IP access control list on a router?

A. show access-list
B. show ip route
C. show ip interface
D. show interface
E. show interface list
F. show ip interface brief

30. What is the purpose of typing o/r 0x2142 during a password recover procedure on a 2500 series router?

A. To enter ROM Monitor mode.
B. To restart the router.
C. To bypass the configuration in NVRAM.
D. To view the lost password.
E. To save the changes to the configuration.

31. New switches have been purchased for a network upgrade. The objective for the network design emphasizes efficient, error-free transport instead of fast transport. Which switching mode should be configured on the new switches to provide error-free transport to the network?

A. cut-through
B. fragment-free
C. frame-filtering
D. store-and-forward
E. 802.1q forwarding
F. VTP transparent mode

32. A router with a serial interface will be used for an ISDN link. What other function group devices are required to complete the connection to the service provider? (Choose two)

A. TE1
B. TE2
C. TA
D. NT1
E. NT2

33. Exhibit:

Which of the following will configure a static route on Router Contoso1 to network 180.18.30.0/24 with an administrative distance of 90?

A. Contoso1(config)# ip route 90 180.18.30.0 255.255.255.0 182.18.20.2
B. Contoso1 (config)# ip route 90 180.18.20.1 255.255.255.0 182.18.20.2
C. Contoso1 (config)# ip route 180.18.20.1 255.255.255.0 182.18.30.0 90
D. Contoso1 (config)# ip route 180.18.30.1 255.255.255.0 182.18.20.1 90
E. Contoso1 (config)# ip route 180.18.30.0 255.255.255.0 182.18.20.2 90

34. Exhibit:

hostname Cert
!
username cert password Contoso
!
interface serial 0
ip address 172.23.56.2 255.255.255.0
encapsulation ppp
ppp authentication chap
clock rate 56000

hostname cert
username cert password Contoso!

interface serial 0
ip address 172.23.56.3
255.255.255.0encapsulation ppp ppp
authentication chap

The output shown in the exhibit was taken from two directly connected routers. Based on the output, which of the following would be displayed when the command Router# show interface serial 0 is entered? (Choose two)

A. Serial 0 is up, line protocol is up
B. Serial 0 is up, line protocol is down
C. LCP open
D. LCP closed

35. Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three)

A. 15.234.118.63
B. 92.11.178.93
C. 134.178.18.56
D. 192.168.16.87
E. 201.45.116.159
F. 217.63.12.192

36. Which of the following host addresses are member of networks that can be routed across the public Internet? (choose all that apply)

A. 10.172.13.65
B. 172.16.223.125
C. 172.64.12.29
D. 192.168.23.252
E. 198.234.12.95
F. 212.192.48.254

37. Which connections allow the use of full-duplex Ethernet? (Choose three)

A. Switch to host
B. Switch to switch
C. Hub to hub
D. Switch to hub
E. Host to host

38. What is the purpose of pressing the Ctrl+Break keys during the router password recover procedure?

A. To restart the router.
B. To bypass the configuration in Flash.
C. To view the password before changes are made.
D. To bypass setup configuration mode.
E. To access ROM Monitor mode.

39. Five minutes after issuing the show running-config command, a technician enters the command again and notices that several access list statements have been altered. Because of this, the technician believes that the router is being configured by an unknown person through Telnet. Before changing the router passwords, the technician would like to discover if anyone is connected to the router by Telnet and stop them from making further changes. Which commands will accomplish these options? (Choose two)

A. show hosts
B. show sessions
C. show connections
D. disconnect
E. CTRL+SHIFT+6x
F. exit

40. Which of the following belong to the ISDN TE2 function group? (Choose two)

A. A standard PC.
B. An ISDN phone.
C. An ISDN terminal adapter.
D. A router serial interface.
E. A router ISDN BRI "U" interface.

41. An administrator would like to configure a switch over a virtual terminal connection from locations outside of the local LAN. Which of the following are required in order for the switch to be configured from a remote location? (Choose two)

A. The switch must be configured with an IP address, subnet mask, and default gateway.
B. The switch must be connected to a router over a VLAN trunk.
C. The switch must be reachable through a port connected to its management VLAN.
D. The switch console port must be connected to the Ethernet LAN.
E. The switch management VLAN must be created and have a membership of at least one switch port.
F. The switch must be fully configured as an SMTP agent.

42.
The network administrator of the Contoso1 router adds the following command to the router configuration:

ip route 192.168.12.0 255.255.255.0 172.16.12.1

What are the results of adding this command? (Choose two)

A. The command establishes a static route.
B. The command invokes a dynamic routing protocol for 192.168.12.0.
C. Traffic for network 192.168.12.0 is forwarded to 172.16.12.1.
D. Traffic for all networks is forwarded to 172.16.12.1.
E. This route is automatically propagated throughout the entire network.

43. What is the subnet work address for a host with IP address 201.100.5.68/28?
A. 201.100.5.0
B. 201.100.5.32
C. 201.100.5.64
D. 201.100.5.65
E. 201.100.5.31
F. 201.100.5.1

44. Which of the following statements regarding routed and routing protocols are true? (Choose two)

A. A routed protocol is assigned to an interface and determines the method of packet deliver.
B. A routing protocol determines the path of a packet through a network.
C. A routed protocol determines the path of a packet through a network.
D. A routing protocol operates at the transport layer of the OSI model.
E. A routed protocol updates the routing table of a router.

45. What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation?

A. 0x2100
B. 0x2101
C. 0x2102
D. 0x2124
E. 0x2142

46. Exhibit:

hostname Contoso-A
!
!
interface Ethernet0
!
ip address 192.168.10.9 255.255.255.248
interface Serial0 ip address 172.16.25.1 255.255.255.0clockrate 56000
!
interface Serial1
!
ip address 10.1.1.1 255.255.255.0
router rip
network 192.168.10.0
!
line con 0
password Contoso
log in
line aux 0
line vty 0 4
password Contosologin!end

47. Five new routers need to be configured quickly for testing. While connected to a router by console, the administrator copies and pastes a configuration from e text file, a part of which is shown in the exhibit, into the HyperTerminal window. Why would host 192.168.10.10/29 be unable to ping the Ethernet interface of the router as a result of this procedure?

A. The new configuration needs to be saved to the NVRAM before the changes take effect.
B. The router needs to be reloaded before the changes are implemented.
C. The Ethernet network does not show up in the routing table because the RIP configuration is incomplete.
D. The copied configuration did not overwrite the shutdown command on the Ethernet interface.
E. The subnet mask on the router prevents the host from communicating with it.

49. The following access list was applied outbound on he E0 interface connected to the 192.168.1.8/29 LAN: access-list 123 deny tcp 192.168.1.8 0.0.0.7 eq 20 any access- list 123 deny tcp 192.168.1.9 0.0.0.7 equal 21 any What effect will this access list have?

A. All traffic will be allowed to exit E0 except FTP traffic.
B. FTP traffic from 192.168.1.22 to any host will be denied.
C. FTP traffic from 192.168.1.9 to any host will be denied.
D. All traffic exiting E0 will be denied.
E. All FTP traffic to network 192.168.1.8/29 from any host will be denied.

50. Which of the following describe router functions? (Choose three)

A. Packet switching
B. Collision prevention on a LAN segment
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internet work communication
(source: Vnpro)

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	29/07/2006 03:13:27 (+0700) \| #7 \| 10719

dabu
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Joined: 03/03/2003 03:31:20
Messages: 226
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25. How many usable sub network and usable hosts per subnet result in the network address 201.105.13.0 is sub netted with a mask of /26?

A. 64 network and 4 hosts
B. 4 network and 64 hosts
C. 2 network and 62 hosts
D. 62 network and 2 hosts

Câu này thì đáp án đúng là câu :B
Vì nó có các subnet như sau :201.105.13.0/26 và 201.105.13.64/26,201.105.13.128/26 và 201.105.13.192/26

Câu trả lời này em sai vì bỏ subnet đầu và subnet cuối , vậy đáp án đúng là câu C.
Theo cách tính /26 là mượn 2 bít làm host nên: 2^2-2 = 2 networks.
còn 6 bit làm host nên: 2^6-2 = 62 host.

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	29/07/2006 22:47:50 (+0700) \| #8 \| 10914

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
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4. Which statement describes the rule of split horizon?

A. Only routers can split boundaries (horizons) between concentric networks.
B. All distance vector protocols require fall back routers that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routers is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update come.
E. Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.

Quá trình chống loop xảy ra trong split horizon là không gửi lại thông tin định tuyến xuất phát tử nơi gửi nên câu trả lời là câu: D

1.Which statement describes the routing protocol OSPF (choose 3)

A.It supports VLSM
B.It is used to between Autonomous systems
C.It confines network instability to one area of network
D.It increases routing overhead over the network
E.It allows extensive control of the routing update
F.it is simpler to configure than RIPv2

OSPF không sử dụng Autonomous, không đơn giản hơn RIPv2, không mở rộng điều khiển trên bảng định tuyến.
Nên câu trả lời là : A & C & D

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	30/07/2006 04:43:02 (+0700) \| #9 \| 10986

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
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Hi, không thấy ai vào thảo luận hết, thôi làm 1 mình cũng chả sao

50. Which of the following describe router functions? (Choose three)

A. Packet switching
B. Collision prevention on a LAN segment
C. Packet filtering
D. Broadcast domain enlargement
E. Broadcast forwarding
F. Internet work communication

Câu hỏi là mô tả các chức năng của Router.
A : Chuyển mạch gói. Thông thường như tên gọi của nó Router có chức năng route tức là định tuyến.
Ngoài ra nó có các chức năng khác như:
A -Phát chuyển gói tin
C-Lọc các gói theo các câu lệnh : Access list
F.Truyền thông Internet.
Đặt biệt Router không forward Broadcast.

45. What should the configuration register value be after successfully completing the password recover procedure and returning the router to normal operation?

A. 0x2100
B. 0x2101
C. 0x2102
D. 0x2124
E. 0x2142

Khi phục hồi lại password cho Router, để Router boot bình thường thì giá trị chỉnh lại là : 0x2102.Vậy đáp án là câu: C

43. What is the subnet work address for a host with IP address 201.100.5.68/28?
A. 201.100.5.0
B. 201.100.5.32
C. 201.100.5.64
D. 201.100.5.65
E. 201.100.5.31
F. 201.100.5.1

Đáp án là câu: C

p/s: Mọi người quan tâm tham gia cho vui smilie

It's time to build a new network.

[Question] Thảo luận các câu hỏi CCNA	30/07/2006 04:46:00 (+0700) \| #10 \| 10987

Mulan
HVA Friend

Joined: 01/02/2002 15:09:07
Messages: 274
Location: 127.0.0.1
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Cái này là tự post rồi tự trả lời.
Nếu thấy câu nào khó, không có đáp án, không hiểu đề bài, không hiểu các phương án trả lời thì post lên để mọi người bắt đầu thảo luận smilie

[Question] Re: Thảo luận các câu hỏi CCNA	31/07/2006 00:21:29 (+0700) \| #11 \| 11122

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

35. Given a subnet mask of 255.255.255.224, which of the following addresses can be assigned to network hosts? (Choose three)

A. 15.234.118.63
B. 92.11.178.93
C. 134.178.18.56
D. 192.168.16.87
E. 201.45.116.159
F. 217.63.12.192

Theo tính toán thì A. 15.234.118.63,E. 201.45.116.159 = địa chỉ Broadcast ,F. 217.63.12.192 = địa chỉ đường mạng.
Vậy đáp án đúng là : B,C,D

36. Which of the following host addresses are member of networks that can be routed across the public Internet? (choose all that apply)

A. 10.172.13.65
B. 172.16.223.125
C. 172.64.12.29
D. 192.168.23.252
E. 198.234.12.95
F. 212.192.48.254

các Private IP: 10.0.0.0- 10.255.255.255
172.16.0.0-172.31.255.255
192.168.x.x-192.168.255.255
Nên kết quả của câu này là: C,E,F
:! smilie

37. Which connections allow the use of full-duplex Ethernet? (Choose three)

A. Switch to host
B. Switch to switch
C. Hub to hub
D. Switch to hub
E. Host to host

Full-Duplex là quá trình song công hoàn toàn, nên nó không xuật hiện trên Hub, Quá trình phát chuyển thông qua Hub là quá trình Collision domain, quá trình này dùng CSMA/CD để chống xung đột.
Nên câu trả lời đúng là: A,B,E

38. What is the purpose of pressing the Ctrl+Break keys during the router password recover procedure?

A. To restart the router.
B. To bypass the configuration in Flash.
C. To view the password before changes are made.
D. To bypass setup configuration mode.
E. To access ROM Monitor mode.

Khi muốn khởi động Router vào chế độ ROM mode thì dùng tổ hợp phím này, nên câu trả lời là: E

:? smilie

It's time to build a new network.

[Question] Re: Thảo luận các câu hỏi CCNA	01/08/2006 22:39:46 (+0700) \| #12 \| 11629

dabu
Elite Member

Joined: 03/03/2003 03:31:20
Messages: 226
Offline

(tiếp nha)
51. A Class C network address has been subnetted with a /27 mask. Which of the following addresses is a broadcast address for one of the resulting subnets?

A. 201.57.78.33
B. 201.57.78.64
C. 201.57.78.97
D. 201.57.78.97
E. 201.57.78.159
F. 201.57.78.254
52. Which command is required for connectivity in a Frame Relay network if Inverse ARP is not operational?

A. frame-relay arp
B. frame-relay map
C. frame-relay interface-dlci
D. frame-relay lmi-type
53. Exhibit:

A network administrator in London has been instructed to prevent all traffic originating on the Paris LAN from entering the Contoso2 router. Which statement would accomplish this filtering?

A. access-list 101 deny ip 192.168.45.0 0.0.0.255 any
B. access-list 101 deny ip 192.168.45.0 0.0.0.0 any
C. access list 101 deny ip 192.168.46.0 0.0.0.0.255 198.168.45.0 0.0.0.255
D. access-list 101 deny ip 192.168.46.0 0.0.0.255 any

54. Identify three valid host addresses in the 192.168.27.0 network with a subnet mask of 255.255.255.240. (Choose three)
C. 192.168.27.33
D. 192.168.27.112
E. 192.168.27.119
F. 192.168.27.126
G. 192.168.27.175
H. 192.168.27.208
55. You are upgrading your Cisco router IOS from a TFTP server over the network. The upgrade procedure is stopped and you are prompted to erase the current flash contents before continuing. What is most plausible reason for this?
A. There is insufficient room for more than one image.
B. The router has detected a copy of the current software image on the TFTP server.
C. The file can be relocated and not compressed.
D. The image to load is a binary executable file.
56. At Layer 2 of the OSI model, which component connects a host to the network media?

A. Hub
B. Switch
C. Bridge
D. NIC
E. Transceiver

57. Routercs# show ip route

Codes: C-connected, s-static, l -IGRP, R -RIP, M -mobile, B -BGP, D -EIGRP, EX - EIGRP external, O -OSPF, IA -OSPF inter area, EI -OSPF external type 1, E2 -OSPF external type 2, E -EGP, i -IS-IS, L1 -IS-IS level-1, L2 -IS-IS level-2, * -candidate default, U - per-user static route
Gateway of last resort is not set
R 202.30.8.0 /24[120/1] via 202.30.2.2, 00:00:10, Serial 0
C 202.30.9.0 /24 is directly connected, Serial 1
R 202.30.10.0 /24 [120/7] via 202.30.9.1, 00:00:02, Serial 1
R 202.30.11.0 /24 [120/7] via 202.30.9.1, 00:00:03, Serial 1
C 202.30.1.0 /24 is directly connected, Ethernet 0
C 202.30.2.0 /24 is directly connected, Serial 0
R 202.30.3.0 /24 [120/1] via 202.30.2.2, 00:00:10. Serial 0
R 202.30.4.0 /24 [120/15/ via 202.30.2.2, 00:00:10, Serial 0
R 202.30.5.0 /24 [120/15] via 202.30.2.2, 00:00:10, Serial 0
R 202.30.6.0 /24 [120/15] via 202.30.2.2, 00:00:10, Serial 0
R 202.30.7.0 /24 [120/1] via 202.30.2.2, 00:00:10, Serial 0

You examine the routing table of your router named Routercs. This routing table will be send to neighboring routers via broadcasts. Some routes might be discarded and not entered in to the routing tables of the neighboring RIP routers. Which of the following routes would be discarded in this way?

A. R 202.30.8.0/24 [120/1] via 202.30.2.2, 00:00:10, Serial0
B. R 202.30.11.0/24 [120/7] via 202.30.9.1, 00:00:03, Serial1
C. C 202.30.1.0/24 is directly connected, Ethernet0
D. R 202.30.5.0/24 [120/15] via 202.30.2.2, 00:00:10, Serial0
58. Routercs# show ip route

Codes: C-connected, s-static, l -IGRP, R -RIP, M -mobile, B -BGP, D -EIGRP, EX - EIGRP external, O -
OSPF, IA -OSPF inter area, EI -OSPF external type 1, E2 -OSPF external type 2, E -EGP, i -IS-IS, L1 -IS-IS
level-1, L2 -IS-IS level-2, * -candidate default, U - per-user static route

Gateway of last resort is not set

R 202.30.8.0 /24[120/1] via 202.30.2.2, 00:00:16, Serial 0C 202.30.9.0 /24 is directly connected, Serial 1
R 202.30.10.0 /24 is possibly down, routing via 202.30.9.1, Serial 1
R 202.30.11.0 /24 is possibly down, routing via 202.30.9.1, Serial 1
C 202.30.1.0 /24 is directly connected, Ethernet 0
C 202.30.2.0 /24 is directly connected,Serial 0
R 202.30.3.0 /24 [120/1] via 202.30.2.2, 00:00:17. Serial 0R 202.30.4.0 /24 [120/15/ via 202.30.2.2, 00:00:17, Serial 0
R 202.30.5.0 /24 [120/15] via 202.30.2.2, 00:00:17, Serial 0
R 192.158.6.0 /24 [120/15] via 202.30.2.2, 00:00:17, Serial 0
R 202.30.7.0 /24 [120/1] via 202.30.2.2, 00:00:17, Serial 0

You are troubleshooting a router with default settings. You are concerned about the 202.30.10.0 and 202.30.11.0 routes. In particular you are interested how long they will be kept in the routing table. What would be the maximum time these routes would be kept in the routing table?

A. 30 seconds
B. 60 seconds
C. 240 seconds
D. 360 seconds
E. 630 seconds

59. You work as a network technician at Contoso. You have completed the password recovery procedure on a Cisco router. The process is successful and the router returns to normal operation. What is configuration register value at this point of time?

A. 0x2100
B. 0x2101
C. 0x2102
D. 0x2124
E. 0x2142

60. Your Contoso trainee Boris is configuring a serial interface on a Cisco router. He asks you want encapsulations he can use on the interface.
What should you tell him? (Choose three)

A. Ethernet
B. Token Ring
C. HDLC
D. Frame Relay
E. PPP

61. You are configuring a network at Contoso main site in Toronto. You use a distance vector routing protocol. What could you use to prevent rooting loops in the network? (Choose two)
A. Link-state advertisements (LSA)
B. Spanning Tree Protocol
C. Shortest path first tree
D. Split horizon
E. Hold-down timers

62. Your Contoso trainee Jose are interested in ACL’s (access control lists). He asks you want they can be used for. What should you tell him? (Choose three)
A. Protect hosts from viruses.
B. Classify network traffic.
C. Provide high network availability.
D. Identify interesting traffic for DDR.
E. IP route filtering.
F. Monitor the number of bytes and packets.
63. You work as a network consultant. You are planning a network installation for a large organization named Contoso. The design requires 100 separate subnet works, so Contoso has acquired a Class B network address. What subnet mask will provide the 100 subnet works required, if 500 usable host addresses are required per subnet?

A. 255.255.240.0
B. 255.255.246.0
C. 255.255.252.0
D. 255.255.254.0
E. 255.255.255.0
F. 255.255.255.192
64. You work as a network technician at Contoso. You are required to establish a Telnet session with a Cisco router. Which commands should you use?

A. Contoso1(config)# line console 0
B. Contoso1(config)# line console 0
C. Contoso1(config)# line console 0
D. Contoso1(config)# line vty 0
E. Contoso1(config)# line vty 0
F. Contoso1(config)# line vty 0
65. Your Contoso trainee Fernanda is studying the spanning three algorithm. She asks you how the spanning-tree path cost is determined by default. What should you tell her?

A. Total hop count.
B. Sum of the costs based on bandwidth.
C. Dynamically determined based on load.
D. Individual link cost based on latency.
66. You work as a network technician at Contoso. You have subnetted the 201.105.13.0 network with a /26 mask. Your boss asks you how many usable sub networks and usable host addresses per subnet this will provide. What should you tell her?

A. 64 networks and 4 hosts
B. 4 networks and 64 hosts
C. 2 networks and 62 hosts
D. 62 networks and 2 hosts
67. You work as a network technician at Contoso. You have subnetted the 213.105.72.0 network with a /28 mask. Your boss asks you how many usable sub networks and usable host addresses per subnet this will provide. What should you tell her?

A. 62 networks and 2 hosts
B. 6 networks and 30 hosts
C. 8 networks and 32 hosts
D. 16 networks and 16 hosts
E. 14 networks and 14 hosts

68. You are working as a network technician at Contoso. You are required to troubleshooting the WAN link between the Contoso main office at Boston and the Contoso remote office at Rio De Janeiro. A Cisco router that was providing Frame Relay connectivity at the Rio de Janeiro site as replaced with a different vendor's frame relay router. Connectivity is now down between the Boston and Rio De Janeiro site.
What is the most likely cause of the problem?

A. Mismatched LMI types.
B. Incorrect DLCI.
C. Mismatched encapsulation types.
D. Incorrect IP address mapping.

69. You have told your boss at Contoso that the OSI model has 7 layers. He is curious which on the application layer. He asks you to give him to examples of items associated with the layer.

What should you tell him? (choose two)

A. ping
B. Telnet
C. FTP
D. TCP
E. IP

70. Exhibit: o/r 0x2142

You are working with a 2500 series Cisco router. You are performing the password recovery procedure. You have just typed the command shown in the exhibit. Your Contoso trainee Mahmoud is curious on the purpose of this command. What should you tell him? (choose all that apply)

A. To restart the router.
B. To bypass the configuration in NVRAM.
C. To view the lost password.
D. To save the changes to the configuration.
E. To enter ROM Monitor mode.
71. Your boss at Contoso want you to brief him on differences and similarities between bridges and switches. What should you tell her? (Choose two)

A. Bridges are faster than switches because they have fewer ports.
B. A switch is a multi port bridge,
C. Bridges and switches learn MAC addresses by examining the source MAC address of each frame received.
D. A bridge will forward a broadcast but a switch will not.
E. Bridges and switches increase the size of a collision domain.

72. Your Contoso trainee Bob wants some information regarding the split horizon rule. What should you tell him?

A. Only routers can split boundaries (horizons) between concentric networks.
B. All distance vector protocols require fall back routes that may cause momentary loops as the topology changes.
C. Networks can only remain fully converged if all information about routes is sent out all active interfaces.
D. Information about a route should not be sent back in the direction from which the original update came.
E. Each AS must keep routing tables converged to prevent dead routes from being advertised across the AS boundary.
73. Your Contoso trainee Ellen is studying the basic of distance vector and link state routing protocols. As her mentor, what could you tell her? (Choose two)

A. Distance vector protocols send the entire routing table to directly connected neighbors.
B. Link state protocols send the entire routing table to all routers in the network.
C. Distance vector protocols send updates about directory connected neighbors to all networks listed in the routing table.
D. Link state protocols send updates containing the state of their own links to all other routers on the network.
74. You have segmented a network into two separate segments, segment 1 and segment2, with a Cisco router. Your boss at Contoso is concerned about the cost, and wants to what the purpose of your action is.

What should you tell him?

A. It increases the number of collisions.
B. It decreases the number of broadcast domains.
C. It connects segment 1's broadcasts to segment 2.
D. It prevents segment 1's broadcasts from getting to segment 2.

75. Roger is setting up WAN connectivity between the Contoso New York and the Contoso Tokyo offices. He uses a uses two data link layer encapsulations, one for data and one for signaling. Which WAN Service does he use?

A. ISDN
B. Frame Relay
C. ATM
D. FDDI

It's time to build a new network.

[Question] Thảo luận các câu hỏi CCNA	02/08/2006 04:45:08 (+0700) \| #13 \| 11742

vanyen2000
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Joined: 03/06/2005 08:34:02
Messages: 63
Location: Nghệ An
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tự sương ạ bạn.

chấm dứt đi. câu nào ko hiểu thì post thôi.

thanks

batigol

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