[计算机类试卷]思科认证640-802模拟试卷8及答案与解析.doc
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1、思科认证 640-802模拟试卷 8及答案与解析 1 Which of the following are true of Ethernet technology? ( A) Hosts use a logical ring topology. ( B) Hosts use a logical bus topology ( C) Hosts must wait for an electronic signal to transfer data. ( D) Hosts are directly connected to a wiring concentrator called a MSAU. (
2、 E) None of the above 2 What is the purpose of the spanning-tree algorithm in a switched LAN? ( A) To provide a monitoring mechanism for networks in switched environments. ( B) To manage VLANs across multiple switches. ( C) To prevent switching loops in networks with redundant switched paths. ( D) T
3、o segment a network into multiple collision domains. ( E) To prevent routing loops in networks. 3 Ezonexam has a Class C network and you need ten subnets. You wish to have as many addresses available for hosts as possible. Which one of the following subnet masks should you use? ( A) 255.255.255.192
4、( B) 255.255.255.224 ( C) 255.255.255.240 ( D) 255.255.255.248 ( E) None of the above 4 What will a new Ezonexam router do during startup if a configuration file is not located in NVRAM? ( A) It will search for the configuration file in the locations specified by boot system commands. ( B) It will s
5、earch for the configuration file in flash and if no configuration file is found there, it will enter the setup dialog. ( C) It will search for the configuration file on a TFTP server and if no configuration file is found there, it will enter the setup dialog. ( D) It will search for the configuratio
6、n file in flash and if no configuration file is found there, it will load a limited configuration file from ROM. ( E) It will search for the configuration file on a TFTP server and if no configuration file is found there, it will load a limited configuration file from ROM. 5 Which type of cable shou
7、ld be used to make a connection between the Fa0/0 port on a router and the Fa0/0 port switch? ( A) Rollover cable ( B) Console cable ( C) Crossover cable ( D) Straight-through cable ( E) Serial cable 6 Which command on router EzonexamA will assign the last usable IP address from the 192.168.32.128/2
8、8 subnetwork to a router interface? A. EzonexamA(config-if)# ip address 192.168.32.142 255.255.255.240 B. EzonexamA(config-if)# ip address 192.168.32.143 255.255.255.240 C. EzonexamA(config-if)# ip address 192.168.32.158 255.255.255.240 D. EzonexamA(config-if)# ip address 192.168.32.145 255.255.255.
9、240 E. EzonexamA(config-if)# ip address 192.168.32.144 255.255.255.240 F. EzonexamA(config-if)# ip address 192.168.32.158 255.255.255.240 G. None of the above 7 Youve been assigned a single Class C address. From this, you need 8 subnets, and your subnet mask is 255.255.255.224. Which one of the foll
10、owing configuration commands would you have to use before you begin? A. Router(config)# ip classless B. Router(config)# ip subnet-zero C. Router(config)# ip version 6 D. Router(config)# no ip classful E. Router(config)# ip unnumbered F. Router(config)# ip all-nets 8 You are given a PC, a router, and
11、 a cable. Select the correct combination that will allow you to log into router VE1 locally using a terminal emulation program such as HyperTerminal. A. Connect the PCs COM port to the routers console port using a straight-through cable. B. Connect the PCs COM port to the routers console port using
12、a rollover cable. C. Connect the PCs COM port to the routers Ethernet port using a straight-through cable. D. Connect the PCs Ethernet port to the routers Ethernet port using a rollover cable. E. Connect the PCs Ethernet port to the routers Ethernet port using a straight- through cable. F. None of t
13、he above 9 You are an administrator of the Ezonexam switched network and your goal is to reduce some of the administrative overhead on your network. You plan on achieving this by configuring a new VLAN for each department in the Ezonexam network. However, you need to share the VLAN information acros
14、s numerous switches. Which of the following would allow you accomplish this? A. STP B. GVRP C. SNMP D. VTP E. DHCP F. None of the above 10 You wish to segment your LAN into multiple broadcast domains. Which technology method should you implement in order to do this? A. Transparent bridging B. Cut-th
15、rough switching C. Fragment-free switches D. Virtual LANs E. Store-and-forward switching F. None of the above 11 Which sequence of actions will allow telnet traffic from a Ezonexam users PC to a router using TCP/IP? A. Connect the PCs COM port to the routers console port using a straight-through cab
16、le. B. Connect the PCs COM port to the routers console port using a crossover cable. C. Connect the PCs COM port to the routers Ethernet port using a straight-through cable. D. Connect the PCs Ethernet port to the routers Ethernet port using a crossover cable. E. Connect the PCs Ethernet port to the
17、 routers Ethernet port using a rollover cable. F. Connect the PCs Ethernet port to the routers Ethernet port using a straight-through cable. G. None of the above 12 Regarding DHCP (dynamic host configuration protocol), which two of the following choices below are true? (Select two answer choices) A.
18、 The DHCP Discover message uses FF-FF-FF-FF-FF as the Layer 2 destination address. B. The DHCP Discover message uses UDP as the transport layer protocol. C. The DHCP Discover message uses a special Layer 2 multicast address as the destination address. D. The DHCP Discover message uses TCP as the tra
19、nsport layer protocol. E. The DHCP Discover message does not use a Layer 2 destination address. F. The DHCP Discover message does not require a transport layer protocol. 13 You need to describe the various types of flow control to your co-workers. Which of the following are types of flow control tha
20、t can be used in a network? (Choose three) A. Congestion avoidance B. Windowing C. Cut-through D. Buffering E. Load Balacing F. Fast Forward 14 CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two) A. To determine t
21、he status of network services on a remote device B. To obtain the IP Address of a connected device in order to telnet to the device C. To verify the type of cable interconnecting two devices D. To verify Layer 2 connectivity between two devices when Layer 3 fails E. To obtain VLAN information from d
22、irectly connected swticehs F. To determine the status of the routing protocols between directly connected routers G. To support automatic network failover during outages 15 The Ezonexam network Topology is displayed in the exhibit below: A switch has been configured for three different VLANs: VLAN 2
23、, VLAN 3, and VLAN 4. For the purposes of communication between VLANs a router is to be added. Host from one VLAN should be able to reach the hosts in the other VLANs.Based on this requirement, what type of connection is acceptable between the router and switch?(Select all valid answers) ( A) 10 Mbp
24、s Ethernet ( B) 56 kbps serial ( C) 100 Mbps Ethernet ( D) 1,544 Mbps serial ( E) 1000 Mbps Ethernet 16 Using a subnet mask of 255.255.255.224, which of the IP addresses below can you assign to the hosts on this subnet? (Select all that apply) A. 16.23.118.63 B. 87.45.16.159 C. 92.11.178.93 D. 134.1
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