思科考试CCNA

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 subnet maskA. 14B. 15C. 16D. 30E. 31F. 622. You have a network that needs 29 subnets while maximizing the number of host addressesavailable on each subnet. How many bits must you borrow from the host field to provide thecorrect subnet maskA. 2B. 3C. 4D. 5E. 6F. 73. What is the subnetwork address for a host with the IP address The network address of provides how many subnets and hostsA. 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 the IP address 10.16.3.65/23 (Choose two.)A. The subnet address is 10.16.3.0 The lowest host address in the subnet is 10.16.2.1 The last valid host address in the subnet is 10.16.2.254 The broadcast address of the subnet is 10.16.3.255 The network is not subnetted.6. If a host on a network has the address what is the subnetwork this hostbelongs toA. On a VLSM network, which mask should you use on point-to-point WAN links in order toreduce the waste of IP addressesA. /27B. /28C. /29D. /30E. /318. What is the subnetwork number of a host with an IP address of You have an interface on a router with the IP address of Including the routerinterface, how many hosts can have IP addresses on the LAN attached to the router interfaceA. 6B. 8C. 30D. 62E. 12610. You need to configure a server that is on the subnet The router has the firstavailable host address. Which of the following should you assign to the serverA. You have an interface on a router with the IP address of What is thebroadcast address the hosts will use on this LANA. You need to subnet a network that has 5 subnets, each with at least 16 hosts. Which classfulsubnet mask would you useA. A network administrator is connecting 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 rollover cable should be used in place of the straight-through cable.C. The subnet masks should be set to A default gateway needs to be set on each host.E. The subnet masks should be set to Address: Address: Cable164 Chapter 3 Subnetting, VLSMs, and Troubleshooting TCP/IP14. If an Ethernet port on a router were assigned an IP address of what wouldbe the valid subnet address of this hostA. Using the following illustration, what would be the IP address of E0 if you were using theeighth subnet The network ID is and you need to use the last available IPaddress in the range. The zero subnet should not be considered valid for this question.A. 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 and you need to use the last availableIP address in the range. Again, the zero subnet should not be considered valid for this question.A. Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is Router(config)#ip classlessB. Router(config)#ip version 6C. 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 Which is the valid host addressA. Your router has the following IP address on Ethernet0: Which of the following can be valid host IDs on the LAN interface attached to the router (Choose two.)A. To test the IP stack on your local host, which IP address would you pingA. 1.0.0.127C. You type show running-config and get this output:[output cut]Line console 0Exec-timeout 1 44Password 7098C0BQRLogin[output cut]What do the two numbers following the exec-timeout command meanA. 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 1 minute and 44 seconds, the console connection willbe closed.D. If you’re connected to the router by a Telnet connection, input must be detected within 1 minute 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 willyou type into the router from user mode to find the broadcast addressA. 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 current startup-config. What command will you useA. replace 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 0A. sh int s0B. sh int serial 0C. show controllers s 0D. show serial 0 controllers25. What keystroke will terminate setup modeA. Ctrl+ZB. Ctrl+^C. Ctrl+CD. Ctrl+Shift+^26. You set the console password, but when you display the configuration, the password doesn’t show up; it looks like this:[output cut]Line console 0Exec-timeout 1 44Password 7098C0BQRLogin[output cut]What cause the password to be stored like thisA. encrypt passwordB. service password-encryptionC. service-password-encryptionD. exec-timeout 1 4427. Which of the following commands will configure all the default VTY ports on a routerA. 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 following commands sets the secret password to CiscoA. enable secret password CiscoB. enable secret ciscoC. enable secret CiscoD. enable password Cisco244 Chapter 4 Cisco’s IOS and Security Device Manager29. If you wanted administrators to see a message when logging into the router, which command would you useA. message banner motdB. banner message motdC. banner motdD. message motd30. How many simultaneous Telnet sessions does a Cisco router support by defaultA. 1B. 2C. 3D. 4E. 5F. 631. What command do you type to save the configuration stored in RAM to NVRAMA. Router(config)#copy current to startingB. 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 (10.0.0.1)…OpenPassword required, but none set[Connection to SFRouter closed by foreign host]Corp#Which of the following sequences will address this problem correctlyA. 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 routerA. delete NVRAMB. delete startup-configC. erase NVRAMD. erase startReview Questions 24534. What is the problem with an interface if you type show interface serial 0 and receive the following messageSerial0 is administratively down, line protocol is downA. The keepalives are different times.B. The administrator has the 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 all interfaces on a routerA. show running-configB. show startup-configC. show interfacesD. show versions36. If you delete the contents of NVRAM and reboot the router, what mode will you be inA. 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 error message displayedA. 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 messageA. The 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 Cisco’s IOS and Security Device Manager39. Which of the 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 you type show interface serial 1 and receive the following messageSerial1 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 provideA. It is used to restart the router.B. It is used to bypass the configuration 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 networkA. transfer IOS to copy run startC. copy tftp flashD. copy start tftpE. copy flash tftp43. You are troubleshooting a connectivity problem in your corporate network and want to isolate the problem. You suspect that a router on the route to an unreachable network is at fault.What IOS user exec command should you issueA. Router>pingB. Router>traceC. Router>show ip routeD. Router>show interfaceE. Router>show cdp neighbors44. You copy a configuration from a network host to a router’s RAM. The configuration looks correct, yet it is not working at all. What could the problem beA. You copied the wrong configuration into RAM.B. You copied the configuration into flash memory instead.C. The copy did not override the shutdown command 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 image currently installed. What command will display the amount of memory consumed by the currentIOS image and indicate whether there is enough room available to hold both the currentand new imagesA. 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 the router. What should be done before a new configuration is entered in the routerA. 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 command loads a new version of the Cisco IOS into a routerA. copy flash ftpB. copy ftp flashC. copy flash tftpD. copy tftp flash48. Which command will show you the IOS version running on your routerA. sh IOSB. sh flashC. sh versionD. sh running-config49. What should the configuration register value be after you successfully complete the password recovery procedure and return the router to normal operationA. 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 blank configuration.What can the problem beA. You didn’t 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 hardware.51. If you want to have more than one Telnet session open at the same time, what keystroke combination would you useA. 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 two.)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 commandC. 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(Choose 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 Telnet session. What command do you type inA. closeB. disableC. disconnectD. exit56. You telnet into a remote device and type debug ip rip, but no output from the debug command is seen. What could the problem beA. 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 register settingA. 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 addressA. Fly to Hawaii, console into the switch, then relax and have a drink with an umbrella in it.B. Issue 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. You have your laptop directly connected into a router’s Ethernet port. Which of the following are among 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 Ethernet cable connecting the laptop directly into the router’s Ethernet port mu st bea straight-through cable.D. The laptop must be on the same subnet as the router’s 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 flash memory of the router to accommodate the file tobe copied.60. The configuration register setting of 0x2102 provides what function to a routerA. 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 from 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 can the host do to improve the reliability of this communication sessionA. Send a different source port number.B. Restart the virtual circuit.C. Decrease 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 field63. 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 modelA. PhysicalB. Data LinkC. NetworkD. Transport65. Which of the following 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 __. 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 orderA. Data, frame, packet, segment, bitB. Segment, data, packet, frame, bitC. Data, segment, packet, frame, bitD. Data, segment, frame, packet, 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, thus aiding component development, design, and troubleshooting.B. It enables equipment from different vendors to use the same electronic components, thus saving research and development funds.C. It supports the evolution of multiple competing standards and thus provides business opportunities for equipment manufacturers.D. It encourages industry standardization by defining what functions occur at each layer ofthe 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 bridgeA. 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. Half-duplex Ethernet has higher effective throughput.D. Half-duplex Ethernet has lower effective throughput.E. Half-duplex Ethernet operates in a private broadcast domain.58 Chapter 1 Internetworking71. You want to implement a network medium that is not susceptible to EMI. Which type of cabling should you useA. Thicknet coaxB. Thinnet coaxC. Category 5 UTP cableD. Fiber-optic cable72. Acknowledgments, sequencing, and flow control are characteristics of which OSI layerA. Layer 2B. Layer 3C. Layer 4D. Layer 773. Which of the following are types of flow control (Choose all that apply.)A. BufferingB. Cut-throughC. WindowingD. Congestion avoidanceE. VLANs74. Which of the following types of connections can use full duplex (Choose three.)A. Hub to hubB. Switch to switchC. Host to hostD. Switch to hubE. Switch to host75. What is the purpose of flow controlA. To ensure that data is retransmitted if an acknowledgment is not receivedB. To reassemble segments in the correct order at the destination deviceC. To provide a means for the receiver to govern the amount of data sent by the senderD. To regulate the size of each segment76. Which three statements are true about the operation of a full-duplex Ethernet networkA. There are no collisions in full-duplex mode.B. A dedicated switch port is required for each full-duplex node.C. Ethernet hub ports are preconfigured for full-duplex mode.D. In a full-duplex environment, the host network card must check for the availability of the network media before transmitting.E. The host network card and the switch port must be capable of operating in full-duplex mode. Review Questions 5977. What type of RJ45 UTP cable is used between switchesA. Straight-throughB. Crossover cableC. Crossover with a CSU/DSUD. Crossover with a router in between the two switches78. How does a host on an Ethernet LAN know when to transmit after a collision has occurred (Choose two.)A. In a CSMA/CD collision domain, multiple stations can successfully transmit data simultaneously.B. In a CSMA/CD collision domain, stations must wait until the media is not in use before transmitting.C. You can improve the CSMA/CD network by adding more hubs.D. After a collision, the station that detected the collision has first priority to resend thelost data.E. After a collision, all stations run a random backoff algorithm. When the backoff delay period has expired, all stations have equal priority to transmit data.F. After a collision, all stations involved run an identical backoff algorithm and then synchronize with each other prior to transmitting data.79. What type of RJ45 UTP cable do you use to connect a PC’s COM port to a router or switch console portA. Straight-throughB. Crossover cableC. Crossover with a CSU/DSUD. Rolled80. You have the following binary number:What are the decimal and hexadecimal equivalentsA. 69/0x2102B. 183/B7C. 173/A6D. 83/0xC581. What are the decimal and hexadecimal equivalents of the binary number(Choose two.)A. 159B. 157C. 185D. 0x9DE. 0xD9F. 0x15982. Which of the following allows a router to respond to an ARP request that is intended for a remote hostA. Gateway DPB. Reverse ARP (RARP)C. Proxy ARPD. Inverse ARP (IARP)E. Address Resolution Protocol (ARP)83. You want to implement a mechanism that automates the IP configuration, including IP address, subnet mask, default gateway, and DNS information. Which protocol will you useto accomplish thisA. SMTPB. SNMPC. DHCPD. ARP84. What protocol is used to find the hardware address of a local deviceA. RARPB. ARPC. IPD. ICMPE. BootP85. Which of the following are layers in the TCP/IP model (Choose three.)A. ApplicationB. SessionC. TransportD. InternetE. Data LinkF. Physical86. Which class of IP address provides a maximum of only 254 host addresses per network IDA. Class AB. Class BC. Class CD. Class DE. Class E87. Which of the following describe the DHCP Discover message (Choose two.)A. It uses FF:FF:FF:FF:FF:FF as a layer 2 broadcast.B. It uses UDP as the Transport layer protocol.C. It uses TCP as the Transport layer protocol.D. It does not use a layer 2 destination address.8. Which layer 4 protocol is used for a Telnet connectionA. IPB. TCPC. TCP/IPD. UDPE. ICMP89. Which statements are true regarding ICMP packets (Choose two.)A. They acknowledge receipt of a TCP segment.B. They guarantee datagram delivery.C. They can provide hosts with information about network problems.D. They are encapsulated within IP datagrams.E. They are encapsulated within UDP datagrams.90. Which of the following services use TCP (Choose three.)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP91. Which of the following services use UDP (Choose three.)A. DHCPB. SMTPC. SNMPD. FTPE. HTTPF. TFTP92. Which of the following are TCP/IP protocols used at the Application layer of the OSI model (Choose three.)A. IPB. TCPC. TelnetD. FTPE. TFTP93. The following illustration shows a data structure header. What protocol is this header fromA. IPB. ICMPC. TCPD. UDPE. ARPF. RARP94. If you use either Telnet or FTP, which is the highest layer you are using to transmit dataA. ApplicationB. PresentationC. SessionD. Transport95. The DoD model (also called the TCP/IP stack) has four layers. Which layer of the DoD model is equivalent to the Network layer of the OSI modelA. ApplicationB. Host-to-HostC. InternetD. Network Access96. Which two of the following are private IP addressesA. 12.0.0.1B. What layer in the TCP/IP stack is equivalent to the Transport layer of the OSI model A. ApplicationB. Host-to-HostC. InternetD. Network Access98. Which statements are true regarding ICMP packets (Choose two)A. ICMP guarantees datagram delivery.B. ICMP can provide hosts with information about network problems.C. ICMP is encapsulated within IP datagrams.D. ICMP is encapsulated within UDP datagrams.99. What is the address range of a Class B network address in binaryA. 01xxxxxxB. 0xxxxxxxC. 10xxxxxxD. 110xxxxx100. Which of the following protocols uses both TCP and UDPA. FTPB. SMTPC. TelnetD. DNS答题卡。