《网络系统设计与工程》试卷(with Answer无密码)-050709.doc

浙江大学20042005学年夏季学期网络系统设计与工程课程期末考试试卷开课学院：计算机学院 ，考试形式：闭，允许带_入场考试时间：_2005_年_7月_9_日,所需时间： 120 分钟考生姓名： _学号： 专业： _ 题序一二三四五六七八总 分得分评卷人注意事项：1. 请把答案写在答题纸对应的题号内；2. 有关IP地址表达方式，如果没有特别的掩码标明，则均按标准地址分类表示。一、 Please select the best choice for following question (60 points)1. Which of the following would be used to connect a router to an Ethernet switch?A. straight-through RJ45 cable B. cross-over RJ45 cable C. RS232 cableD. a V.35 cable2. How do you connect to a router using HyperTerminal?A. Connect the Ethernet port of your host to the Ethernet interface of the router using a rolled cable.B. Connect the COM port of your host to the Ethernet port of your router using a straight-through cable.C. Connect the COM port of your host to the console port of the router using a crossover cable.D. Connect the COM port of your host to the console port of the router using a rolled cable.3. Which of following command is used to print routing table of a Quidway router?A. display ip routeB. display ip pathC. show ip routeD. display current-config4. Which layer-2 device enables high-speed data exchange?A. RepeaterB. HubC. SwitchD. Router5. Which of the following is a correct ping to a host?A. Routerping B. Router#ping 55C. Routerping D. Router#ping 566. How many subnets and hosts can you get from the network /26?A. 4 networks with 64 hostsB. 2 networks with 62 hostsC. 254 networks with 254 hostsD. 1 network with 254 hostsAnswer B. I bet you struggled with this one, although it isnt difficult. But the answers will make you think. First, the 254-host answers are not even close, so you have a 50/50 chance between the four-network and two-network options. The part you probably thought about the most is whether Cisco is using subnet-zero. This would provide four networks instead of two. Makes sense. However, Cisco does not consider subnet-zero valid on any of their exams. In addition, you cannot get 64 hosts with this mask, only 62 hosts per subnet, regardless of whether you are using subnet-zero or not, which makes the four network answers completely wrong.7. If a company gets a class B IP addresses and plans to assign to 12 departments equably, the most efficient subnet mask is？ABCD8. Which is the most efficient subnet mask to use on point-to-point links?A. B. 24C. 52D. 489. You are the network administrator for RouterS, and a user cannot reach the corporate server from their remote office. The IP address of the host is 0/24, the default gateway of the host is , and the server is 0/24. You have the user type the following from a DOS prompt: ping ; this is unsuccessful. You then have the user type: ping ; this is also unsuccessful. What could the problem be?A. The router is down.B. The server is down.C. TCP/IP is not initialized on the host.D. The Ethernet cable is unplugged from the host.Answer C. is called the loopback address and is used for diagnostics on a host. If you cannot ping this address, then you have a problem with the IP stack on the host.10. Which of the following prompts indicates that you are in privileged EXEC mode?A. B. (config)#C. #D. !11. If you type a command and receive the error “% incomplete command” from a switch CLI, what would you do to get help?A. Type history to review the errorB. Re-enter the command followed by a question mark to view the keywordsC. Type helpD. Enter a question mark to see all the console commands12. Which of following command is used to print routing table of a Quidway router?Adisplay ip routeBdisplay ip pathCshow ip routeDdisplay current-config13. What keystroke will terminate setup mode in Cisco IOS?A. Ctrl+ZB. Ctrl+C. Ctrl+CD. Ctrl+Shift+14. Which of the following commands will display a backup configuration?A. sh running-configB. show startup-configC. show versionD. show backup-config15. 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 vty 0 4D. Router(config)#line vty all16. Which of the following commands sets the secret password to “Cisco”? A. enable secret password CiscoB. enable secret ciscoC. enable secret CiscoD. enable password Cisco17. Which of the following commands will reload the router?A. RouterreloadB. Router#resetC. Router#reloadD. Router(config)#reload18. What command will display all the valid commands at the given mode?A. helpB. help allC. ?D. list19. What is the problem with an interface if you type show interface serial 0 and receive the following message? “Serial0 is administratively down, line protocol is down”A. 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.20. What layer of the OSI model would you assume the problem is in if you type show interface serial 1 and receive the following message? “Serial1 is a down, line protocol is down”A. Physical layerB. Data Link layerC. Network layerD. None; it is a router problem.21. If you delete the contents of NVRAM and reboot the router, what mode will you be in?A. Privileged modeB. Global modeC. Setup modeD. NVRAM loaded mode22. Which of the following is not stored in RAM?A. Packet buffersB. Startup-configD. ARP cacheE. Routing table23. If you want to display all the commands in the history buffer, which command will you use?A. Ctrl+Shift+6 then XB. Ctrl+ZC. show historyD. show history buffer24. Which of the following commands assigns the IP processing on a router interface?A. enable ipB. network ip_addressC. ip address ip_address netmaskD. reload and restart25. Which command will provide you with information regarding the layer-3 configuration of a routers interfaces?A. show cdp neighborsB. show cdp neighbors detailC. show ip route D. D. show ip interface26. Which command displays all the routed protocols and the interfaces on which each protocol is enabled?A. show protocolsB. show interfaces protocolC. show interfacesD. show ip protocols27. Which of the following is a correct default route?A. route ip s0B. ip route C. ip route 55 D. route ip 15 028. Which of the following is an Internet Protocol (IP) link-state protocol used in the TCP/IP stack?A. RIP V2B. EIGRPC. OSPFD. IGRP29. What is the next command that must be entered after you type router rip?A. network B. network C. passive-interface ethernet 0D. No command is needed.30. Which Cisco IOS command can you use to see the IP routing table?A. sh ip configB. sh ip arpC. sh ip routeD. sh ip table31. Which of the following commands will start RIP version 1 on a router?A. rip routingB. routing ripC. router ripD. rip router32. If your routing table has a static, a RIP, and a BGP route to the same network, which route will be used to route packets?A. Any available routeB. RIP routeC. Static routeD. They will all load-balance33. If the metric of a route in RIP is _, we think its unreachable.A. 9B. 10C. 15D. 16 34. You have two switches connected with a trunked link running two VLANs. VLAN1 is assigned to ports 1 through 3 of each switch and VLAN2 has been assigned port 8 through 12 of each switch. HostA and HostB are in VLAN1. HostG and HostH are in VLAN2. There is no inter-VLAN routing. Which of following statements is false? A. HostA can ping HostB.B. HostA can ping HostG.C. HostG can ping HostH.D. HostG cannot ping HostA.35. Which command will copy the IOS to a backup host on your network?A. copy run startB. copy tftp flashC. copy start tftpD. copy flash tftp36. Which command loads a new version of the Cisco IOS into a router?A. copy flash ftpB. copy ftp flashC. copy flash tftpD. copy tftp flash37. Which command will show you the IOS version running on your router?A. sh IOSB. sh flashC. sh versionD. sh running-config38. Which of the following saves the configuration stored in RAM to NVRAM?A. copy running-config startup-configB. copy tftp running-configC. copy startup-config running-configD. copy active backup39. Which command is used to find the path a packet takes through an internetwork?A. pingB. traceC. ripD. sap40. 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 from a TFTP host41. What does the ISDN Basic Rate Interface (BRI) provide? A. 23 B channels and one 64Kbps D channelB. Total bit rate of up to 1.544MbpsC. Two 56Kbps B channels and one 64Kbps D channelD. Two 64Kbps B channels and one 16Kbps D channel42. What is true about Frame Relay DLCI? Select all that apply.A. DLCI is optional in a Frame Relay network.B. DLCI represents a single physical circuit.C. DLCI identifies a logical connection between DTE devices.D. DLCI is used to tag the beginning of a frame when using LAN switching.43. Which of the following is true regarding CIR?A. It is used in ISDN to allow separate B and D channels.B. It is a signaling standard between the CPE device and Frame Relay switch.C. It is responsible for managing the connection and maintaining status between devices.D. It is the rate, in bits per second, at which the Frame Relay switch agrees to transfer data.44. If you have a remote router with a hostname of “Bob” and you want to set up a PPP authentication link using the password “Cisco” to a local router with a hostname “Todd”, which of the following commands is correct?A. username bob password ciscoB. username Bob password CiscoC. username todd password ciscoD. username Todd password CiscoAnswer：B. To set up authentication, you must use the username command with the hostname of the remote router. This is case sensitive.45. What protocol does PPP use to identify the Network layer protocol?A. NCP B. ISDNC. HDLCD. LCP46. Which protocol does command Ping use?A. TCPB. ARPC. ICMPD. BootP47. Which class of IP address has the most host addresses available by default?A. AB. BC. CD. A and B48. Which protocol does DHCP use at the Transport layer?A. IPB. TCPC. UDPD. ARP49. If your router is facilitating a CSU/DSU, which of the following commands do you need to use to provide the router with a 64000bps serial link?A. RouterA(config-if)#bandwidth 64000B. RouterA(config)#clockrate 64000C. RouterA(config-if)clock rate 64D. RouterA(config-if)clock rate 6400050. Which protocol is used to find an Ethernet address from a known IP address?A. IPB. ARPC. RARPD. BootP51. Which protocol is used to send a Destination Network Unknown message back to originating hosts?A. TCPB. ARPC. ICMPD. BootP52. What protocol is used at layer-2 to help stop network loops?A. BPDUB. STPC. VLANsD. Switches53. What is the bit length of a MAC address?A. 24 bits B. 48 bits C. 64 bits D. 32 bits54. Which of the following is the valid host range for the subnet that IP address 88 92 indicated?A. 29190B. 29191C. 28190D. 2819255. For analog WAN services a _ is required?A. DCE B. DTEC. ModemD. NIC56. Which of the following is the network layer protocol that PPP supports?A. Novell IPXB. IPC. AppleTalkD. All of the above57. When you are running PPP, LCP is responsible for which of the following? A. Establishment, maintenance, and termination of the point-to-point connection B. Maintenance of several linksC. Router updatesD. Compression58. What type of handshaking occurs when CHAP is selected PPP authentication protocol?A. One-wayB. Two-wayC. Three-wayD. Four-way59. What command on the router can you use to check the LCP and NCP states for PPP？Aroutershow interfaces Brouter(config)#show interfacesCrouter#show interfacesDrouter(config-if)#show interfaces60. Which of following command can print configuration information in RAM for a Quidway router?A. display ram-configB. display configC. display interfacesD. display current-config二、 (12 points)There are two switches, a Cisco C2950 and Quidway 2403H. They are connected as following figure. In order to dividing different departments, two VLANs are created. PCs can only communicate among same VLANs. Switch A and B are connected and configured via trunk port. 0/1 0/3 0/2 0/2 0/1 0/4 0/4 0/3 BAVlan-2 Vlan-3Vlan-3Vlan-2 Switch A：Cisco2950Switch B：Quidway 2403HPlease choose BEST items from following lists to answer following questions:(1). To connect two switches correctly, a _ cable must be used(2). To connect PCs and switches correctly, _ cables must be used(3). To create VLAN 2 on switch A, please choose best commands from following and fill them in the blank in correct order: _、_(4). To create VLAN 3 on switch B, please choose best commands from following and fill them in the blank in correct order: _(5). To choose port 3 on switch A and add it into VLAN-2. The port is used in access mode. Please choose best commands from following and fill them in the blank in correct order: _、_、_(6). To choose port 3 on switch B and add it into VLAN-3, please choose best commands from following and fill them in the blank in correct order: _、_(7). To choose port 1 on switch B and configure it as a trunk port , please choose best commands from following and fill them in the blank in correct order: _、_Answer: (1) B (2) A (3) E G (4) D (5) J L N or J N L or J N (6) D X (7) P TCommand Lists: A. straight-through B. cross-over C. Quidway vlan 2 D. Quidway vlan 3 E. Switch# vlan database F. Switch# vlan 2 name Vlan2 G. Switch(vlan)# vlan 2 name Vlan2H. Switch(config)# interface fastethernet 0/1 I. Switch(config)# interface fastethernet 0/2J. Switch(config)# interface fastethernet 0/3K. Switch(config)# switchport mode accessL. Switch(config-if)# switchport mode accessM. Switch(config)# switchport access vlan 2N. Switch(config-if)# switchport access vlan 2O. Switch(config-if)# switchport mode dynamic desirablePQuidway interface fastethernet 0/1QQuidway interface fastethernet 0/2RQuidway interface fastethernet 0/3SQuidway port trunk permit vlan allTQuidway-fastethetnet0/1 port trunk permit vlan allUQuidway port FastEthernet 0/2VQuidway port FastEthernet 0/3WQuidway-vlan2 port FastEthernet 0/2XQuidway-vlan3 port FastEthernet 0/3三、 (10 points) R2R3E0:/24R1E0:/24E0:/24S0:/24S0:/24S1:/24S0:/2400/2400/24In this network figure, RIP protocol is used ONLY in router R1 and R2. Any dynamical routing protocol is not used in router R3. To make all network segments communicate each other, please choose BEST commands from following lists and fill them in the blank in correct order:(1). Router R1s configuration：_, _, _, _, _；A (B C D L)(2). Router R2s configuration：_, _, _, _； A (B E K)(3). Router R3s configuration：_； KCommand Lists: ARouter(config)#router ripBRouter(config-router)#net CRouter(config-router)#net DRouter(config-router)#net ERouter(config-router)#net FRouter(config-router)#net GRouter(config-router)#ip route s1HRouter(config-router)#ip route s0JRouter(config)#ip route s1KRouter(config)#ip route s0LRouter(config)#ip route MRouter(config)#ip r