思科考试CCNA

1、专业_ 班级_ 姓名_ 密封线 正大教育计算机培训中心思科认证期末考试CCNA(1)适用班级：CCNA注意事项：1.在试卷的标封处填写姓名和班级2.考试时间共120分钟3.答案写在答题卡上1. What is the maximum number of IP addresses that can be assigned to hosts on a local subnetthat uses the 24 subnet mask?A. 14B. 15C. 16D. 30E. 31F. 622. You have a network that needs 29 subne

2、ts while maximizing the number of host addressesavailable on each subnet. How many bits must you borrow from the host field to provide thecorrect subnet mask?A. 2B. 3C. 4D. 5E. 6F. 73. What is the subnetwork address for a host with the IP address 8/28?A. 6B. 2C. 200.10.

3、5.64D. 4. The network address of /19 provides how many subnets and hosts?A. 7 subnets, 30 hosts eachB. 7 subnets, 2,046 hosts eachC. 7 subnets, 8,190 hosts eachD. 8 subnets, 30 hosts eachE. 8 subnets, 2,046 hosts eachF. 8 subnets, 8,190 hosts each5. Which two statements describe

4、the IP address 5/23? (Choose two.)A. The subnet address is .B. The lowest host address in the subnet is .C. The last valid host address in the subnet is 54 .D. The broadcast address of the subnet is 55 255.255.254.

5、0.E. The network is not subnetted.6. If a host on a network has the address 4/30, what is the subnetwork this hostbelongs to?A. B. C. D. 2E. 67. On a VLSM network, which mask should you use on point-to-point WAN links in order toreduc

6、e the waste of IP addresses?A. /27B. /28C. /29D. /30E. /318. What is the subnetwork number of a host with an IP address of /21?A. B. C. D. 9. You have an interface on a router with the IP address of 0/29. Including the routerinterfac

7、e, how many hosts can have IP addresses on the LAN attached to the router interface?A. 6B. 8C. 30D. 62E. 12610. You need to configure a server that is on the subnet 4/29. The router has the firstavailable host address. Which of the following should you assign to the server?A. 192.168.19.

8、0 B. 3 40C. 6 48D. 1 48E. 4 4011. You have an interface on a router with the IP address of 0/29. What is thebroadcast address the hosts will use on this LAN?A. 5

9、B. 1C. 3D. 27E. 5512. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classfulsubnet mask would you use?A. 92B. 24C. 40D. 4813. A network administrator is conne

10、cting hosts A and B directly through their Ethernet interfaces,as shown in the illustration. Ping attempts between the hosts are unsuccessful. What can bedone to provide connectivity between the hosts? (Choose two.)A. A crossover cable should be used in place of the straight-through cable.B. A rollo

11、ver cable should be used in place of the straight-through cable.C. The subnet masks should be set to 92.D. A default gateway needs to be set on each host.E. The subnet masks should be set to .IP Address: 0Mask 40IP Address: 01Mask 255.255.

12、255.240Straight-through Cable164 Chapter 3 _ Subnetting, VLSMs, and Troubleshooting TCP/IP14. If an Ethernet port on a router were assigned an IP address of /25, what wouldbe the valid subnet address of this host?A. B. C. D. E. 15.

13、 Using the following illustration, what would be the IP address of E0 if you were using theeighth subnet? The network ID is /28 and you need to use the last available IPaddress in the range. The zero subnet should not be considered valid for this question.A. 42B.

14、6C. 54D. 43E. 2616. Using the illustration from the previous question, what would be the IP address of S0 if you wereusing the first subnet? The network ID is /28 and you need to use the last availableIP address in the range. Again, the zero subnet sh

15、ould not be considered valid for this question.A. 4B. 2C. 0D. 2717. Which configuration command must be in effect to allow the use of 8 subnets if the Class Csubnet mask is 24?A. Router(config)#ip classlessB. Router(config)#ip version 6C.

16、Router(config)#no ip classfulD. Router(config)#ip unnumberedE. Router(config)#ip subnet-zeroF. Router(config)#ip all-nets18. You have a network with a subnet of /22. Which is the valid host address?A. 52B. C. D. 172

17、.16.16.1 40E. 55 F. 19. Your router has the following IP address on Ethernet0: /23. Which of the followingcan be valid host IDs on the LAN interface attached to the router? (Choose two.)A. B. 00C. 98

18、D. 55E. F. 5520. To test the IP stack on your local host, which IP address would you ping?A. B. 27C. D. 55E. 5521. You type show running-config and get this output:output cutLine console 0Exec-timeout 1 44Password 7098C0BQR

19、Loginoutput cutWhat do the two numbers following the exec-timeout command mean?A. If no command has been typed in 44 seconds, the console connection will be closed.B. If no router activity has been detected in 1 hour and 44 minutes, the console will be locked out.C. If no commands have been typed in

20、 1 minute and 44 seconds, the console connection willbe closed.D. If youre connected to the router by a Telnet connection, input must be detected within 1minute and 44 seconds or the connection will be closed.22. You need to find the broadcast address used on a LAN on your router. What command willy

21、ou type into the router from user mode to find the broadcast address?A. show running-configB. show startup-configC. show interfacesD. show protocols23. You want to totally reinitialize the router and replace the current running-config with the currentstartup-config. What command will you use?A. repl

22、ace run startB. copy run startC. copy start runD. reloadReview Questions 24324. Which command will show you whether a DTE or a DCE cable is plugged into serial 0?A. sh int s0B. sh int serial 0C. show controllers s 0D. show serial 0 controllers25. What keystroke will terminate setup mode?A. Ctrl+ZB.

23、Ctrl+C. Ctrl+CD. Ctrl+Shift+26. You set the console password, but when you display the configuration, the password doesntshow up; it looks like this:output cutLine console 0Exec-timeout 1 44Password 7098C0BQRLoginoutput cutWhat cause the password to be stored like this?A. encrypt passwordB. service

24、password-encryptionC. service-password-encryptionD. exec-timeout 1 4427. Which of the following commands will configure all the default VTY ports on a router?A. Router#line vty 0 4B. Router(config)#line vty 0 4C. Router(config-if)#line console 0D. Router(config)#line vty all28. Which of the followin

25、g commands sets the secret password to Cisco?A. enable secret password CiscoB. enable secret ciscoC. enable secret CiscoD. enable password Cisco244 Chapter 4 _ Ciscos IOS and Security Device Manager29. If you wanted administrators to see a message when logging into the router, which commandwould you

26、 use?A. message banner motdB. banner message motdC. banner motdD. message motd30. How many simultaneous Telnet sessions does a Cisco router support by default?A. 1B. 2C. 3D. 4E. 5F. 631. What command do you type to save the configuration stored in RAM to NVRAM?A. Router(config)#copy current to start

27、ingB. Router#copy starting to runningC. Router(config)#copy running-config startup-configD. Router#copy run startup32. You try to telnet into SFRouter from router Corp and receive this message:Corp#telnet SFRouterTrying SFRouter ()OpenPassword required, but none setConnection to SFRouter clo

28、sed by foreign hostCorp#Which of the following sequences will address this problem correctly?A. Corp(config)#line console 0B. SFRemote(config)#line console 0C. Corp(config)#line vty 0 4D. SFRemote(config)#line vty 0 433. Which command will delete the contents of NVRAM on a router?A. delete NVRAMB. d

29、elete startup-configC. erase NVRAMD. erase startReview Questions 24534. What is the problem with an interface if you type show interface serial 0 and receive thefollowing message?Serial0 is administratively down, line protocol is downA. The keepalives are different times.B. The administrator has the

30、 interface shut down.C. The administrator is pinging from the interface.D. No cable is attached.35. Which of the following commands displays the configurable parameters and statistics of allinterfaces on a router?A. show running-configB. show startup-configC. show interfacesD. show versions36. If yo

31、u delete the contents of NVRAM and reboot the router, what mode will you be in?A. Privileged modeB. Global modeC. Setup modeD. NVRAM loaded mode37. You type the following command into the router and receive the following output:Router#show serial 0/0% Invalid input detected at marker.Why was this er

32、ror message displayed?A. You need to be in privileged mode.B. You cannot have a space between serial and 0/0.C. The router does not have a serial0/0 interface.D. Part of the command is missing.38. You type Router#sh ru and receive an % ambiguous command error. Why did you receivethis message?A. The

33、command requires additional options or parameters.B. There is more than one show command that starts with the letters ru.C. There is no show command that starts with ru.D. The command is being executed from the wrong router mode.246 Chapter 4 _ Ciscos IOS and Security Device Manager39. Which of the

34、following commands will display the current IP addressing and the layer 1 and2 status of an interface? (Choose three.)A. show versionB. show protocolsC. show interfacesD. show controllersE. show ip interfaceF. show running-config40. What layer of the OSI model would you assume the problem is in if y

35、ou type show interfaceserial 1 and receive the following message?Serial1 is down, line protocol is downA. Physical layerB. Data Link layerC. Network layerD. None; it is a router problem.41. What does the command o/r 0x2142 provide?A. It is used to restart the router.B. It is used to bypass the confi

36、guration in NVRAM.C. It is used to enter ROM Monitor mode.D. It is used to view the lost password.42. Which command will copy the IOS to a backup host on your network?A. transfer IOS to B. copy run startC. copy tftp flashD. copy start tftpE. copy flash tftp43. You are troubleshooting a co

37、nnectivity problem in your corporate network and want to isolatethe problem. You suspect that a router on the route to an unreachable network is at fault.What IOS user exec command should you issue?A. RouterpingB. RoutertraceC. Routershow ip routeD. Routershow interfaceE. Routershow cdp neighbors44.

38、 You copy a configuration from a network host to a routers RAM. The configuration lookscorrect, yet it is not working at all. What could the problem be?A. You copied the wrong configuration into RAM.B. You copied the configuration into flash memory instead.C. The copy did not override the shutdown c

39、ommand in running-config.D. The IOS became corrupted after the copy command was initiated.45. A network administrator wants to upgrade the IOS of a router without removing the imagecurrently installed. What command will display the amount of memory consumed by the currentIOS image and indicate wheth

40、er there is enough room available to hold both the currentand new images?A. show versionB. show flashC. show memoryD. show buffersE. show running-config46. The corporate office sends you a new router to connect, but upon connecting the console cable,you see that there is already a configuration on t

41、he router. What should be done before a newconfiguration is entered in the router?A. RAM should be erased and the router restarted.B. Flash should be erased and the router restarted.C. NVRAM should be erased and the router restarted.D. The new configuration should be entered and saved.47. Which comm

42、and loads a new version of the Cisco IOS into a router?A. copy flash ftpB. copy ftp flashC. copy flash tftpD. copy tftp flash48. Which command will show you the IOS version running on your router?A. sh IOSB. sh flashC. sh versionD. sh running-config49. What should the configuration register value be

43、 after you successfully complete the passwordrecovery procedure and return the router to normal operation?A. 0x2100B. 0x2101C. 0x2102D. 0x214250. You save the configuration on a router with the copy running-config startup-configcommand and reboot the router. The router, however, comes up with a blan

44、k configuration.What can the problem be?A. You didnt boot the router with the correct command.B. NVRAM is corrupted.C. The configuration register setting is incorrect.D. The newly upgraded IOS is not compatible with the hardware of the router.E. The configuration you save is not compatible with the

45、hardware.51. If you want to have more than one Telnet session open at the same time, what keystroke combinationwould you use?A. Tab+spacebarB. Ctrl+X, then 6C. Ctrl+Shift+X, then 6D. Ctrl+Shift+6, then X52. You are unsuccessful in telnetting into a remote device. What could the problem be? (Choose t

46、wo.)A. IP addresses are incorrect.B. Access control list is filtering Telnet.C. There is a defective serial cable.D. The VTY password is missing.53. What information is displayed by the show hosts command? (Choose two.)A. Temporary DNS entriesB. The names of the routers created using the hostname co

47、mmandC. The IP addresses of workstations allowed to access the routerD. Permanent name-to-address mappings created using the ip host commandE. The length of time a host has been connected to the router via Telnet54. Which three commands can be used to check LAN connectivity problems on a router?(Cho

48、ose three.)A. show interfacesB. show ip routeC. tracertD. pingE. dns lookups55. You telnet to a router and make your necessary changes; now you want to end the Telnetsession. What command do you type in?A. closeB. disableC. disconnectD. exit56. You telnet into a remote device and type debug ip rip,

49、but no output from the debugcommand is seen. What could the problem be?A. You must type the show ip rip command first.B. IP addressing on the network is incorrect.C. You must use the terminal monitor command.D. Debug output is sent only to the console.57. Which command displays the configuration reg

50、ister setting?A. show ip routeB. show boot versionC. show versionD. show flash58. You need to gather the IP address of a remote switch that is located in Hawaii. What can youdo to find the address?A. Fly to Hawaii, console into the switch, then relax and have a drink with an umbrella in it.B. Issue

51、the show ip route command on the router connected to the switch.C. Issue the show cdp neighbor command on the router connected to the switch.D. Issue the show ip arp command on the router connected to the switch.E. Issue the show cdp neighbors detail command on the router connected to the switch.59.

52、 You have your laptop directly connected into a routers Ethernet port. Which of the following areamong the requirements for the copy flash tftp command to be successful? (Choose three.)A. TFTP server software must be running on the router.B. TFTP server software must be running on your laptop.C. The

53、 Ethernet cable connecting the laptop directly into the routers Ethernet port must bea straight-through cable.D. The laptop must be on the same subnet as the routers Ethernet interface.E. The copy flash tftp command must be supplied the IP address of the laptop.F. There must be enough room in the fl

54、ash memory of the router to accommodate the file tobe copied.60. The configuration register setting of 0x2102 provides what function to a router?A. Tells the router to boot into ROM monitor modeB. Provides password recoveryC. Tells the router to look in NVRAM for the boot sequenceD. Boots the IOS fr

55、om a TFTP serverE. Boots an IOS image stored in ROM61. A receiving host has failed to receive all of the segments that it should acknowledge. What canthe host do to improve the reliability of this communication session?A. Send a different source port number.B. Restart the virtual circuit.C. Decrease

56、 the sequence number.D. Decrease the window size.62. Which fields are contained within an IEEE Ethernet frame header? (Choose two.)A. Source and destination MAC addressB. Source and destination network addressC. Source and destination MAC address and source and destination network addressD. FCS fiel

57、d63. Which layer 1 devices can be used to enlarge the area covered by a single LAN segment?(Choose two.)A. SwitchB. NICC. HubD. RepeaterE. RJ45 transceiver64. Segmentation of a data stream happens at which layer of the OSI model?A. PhysicalB. Data LinkC. NetworkD. Transport65. Which of the following

58、 describe router functions? (Choose four.)A. Packet switchingB. Collision preventionC. Packet filteringD. Broadcast domain enlargementE. Internetwork communicationF. Broadcast forwardingG. Path selection66. Routers operate at layer _. LAN switches operate at layer _. Ethernet hubs operate at layer _

59、.Word processing operates at layer _.A. 3, 3, 1, 7B. 3, 2, 1, noneC. 3, 2, 1, 7D. 2, 3, 1, 7E. 3, 3, 2, none67. When data is encapsulated, which is the correct order?A. Data, frame, packet, segment, bitB. Segment, data, packet, frame, bitC. Data, segment, packet, frame, bitD. Data, segment, frame, p

60、acket, bit68. Why does the data communication industry use the layered OSI reference model? (Choose two.)A. It divides the network communication process into smaller and simpler components, thusaiding component development, design, and troubleshooting.B. It enables equipment from different vendors t

61、o use the same electronic components, thussaving research and development funds.C. It supports the evolution of multiple competing standards and thus provides businessopportunities for equipment manufacturers.D. It encourages industry standardization by defining what functions occur at each layer of

62、the model.E. It provides a framework by which changes in functionality in one layer require changes inother layers.69. What are two purposes for segmentation with a bridge?A. To add more broadcast domainsB. To create more collision domainsC. To add more bandwidth for usersD. To allow more broadcasts for users70. Which of the following are unique characteristics of half-duplex Ethernet when compared tofull-duplex Ethernet? (Choose two.)A. Half-duplex Ethernet operates in a shared collision domain.B. Half-duplex Ethernet operates in a private collision domain.C.