D. 172.1.4.0/24 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24
E. 172.1.4.0/25 172.1.4.128/25 172.1.5.0/24 172.1.6.0/24 172.1.7.0/24 Answer: C
17. Which spread spectrum technology does the 802.11b standard define for operation? 17.哪种扩频技术是802.11B定义使用的
A. IR B. DSSS C. FHSS
D. DSSS and FHSS E. IR, FHSS, and DSSS Answer: B
18. Refer to the exhibit. Assume that all router interfaces are operational and correctly configured. In addition, assume that OSPF has been correctly configured on router R2. How will the default route configured on R1 affect the operation of R2?
18.根据下图，假设所有路由器接口都配置正确且正常工作，假设R2上OSPF配置正确，配置 在R1上默认路由会怎么影响R2的工作
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A. Any packet destined for a network that is not directly connected to router R1 will be dropped. A.任何到达一个和路由器R1非直连的网络的数据包都会被丢弃
B. Any packet destined for a network that is not directly connected to router R2 will be dropped immediately.
B.任何到达一个和路由器R2非直连的网络的数据包都会被丢弃
C. Any packet destined for a network that is not directly connected to router R2 will be dropped
immediately because of the lack of a gateway on R1.
C.任何到达一个和路由器R2非直连的网络的数据包都会即时被丢弃，因为R1上缺少网关
D. The networks directly connected to router R2 will not be able to communicate with the
172.16.100.0, 172.16.100.128, and 172.16.100.64 subnetworks.
D. 直连在 R2 上的网络将不能够和 172.16.100.0, 172.16.100.128, 172.16.100.64 这些子网通
讯
E. Any packet destined for a network that is not referenced in the routing table of router R2 will be directed to R1. R1 will then send that packet back to R2 and a routing loop will occur.
E.任何目的地没有在R2的路由表中的数据包,R2将会定向到R1,R1会发送哪个数据包到R2,这样路 由环路产生
Answer: E
19. A network interface port has collision detection and carrier sensing enabled on a shared twisted pair network. From this statement, what is known about the network interface port? 19.在一个共享的双绞线的网络上的接口上产生了冲突检测和载波侦听.通过这个描述,关于 这个网络接口你知道了什么
A. This is a 10 Mb/s switch port. A.这是一个10 Mb/s的交换端口 B. This is a 100 Mb/s switch port. B.这是一个100Mb/s 的交换端口
C. This is an Ethernet port operating at half duplex.
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C.这是一个工作在半双工模式下的以太口 D. This is an Ethernet port operating at full duplex. D.这是一个工作在全双工模式下的以太口
E. This is a port on a network interface card in a PC. E.这是一个PC机上网卡上的一个接口 Answer: C
20. Refer to the topology and router configuration shown in the graphic. A host on the LAN is accessing an FTP server across the Internet. Which of the following addresses could appear as a source address for the packets forwarded by the router to the destination server?
20.根据下图显示的拓扑结构和路由器配置，一个在该LAN上的主机正在通过INTERNET访 问一个FTP 服务器。下列地址中哪个可以作为路由器发送到该目的服务器的数据包的源地 址。
A. 10.10.0.1 B. 10.10.0.2 C. 199.99.9.33 D. 199.99.9.57 E. 200.2.2.17 F. 200.2.2.18 Answer: D
21. A company is installing IP phones. The phones and office computers connect to the same
device. To ensure maximum throughput for the phone data, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers, and what technology should be implemented on this device? (Choose two.) 21.一个公司正在安装IP 电话。电话和办公室电脑连接到同个设备上，为了保证电话数据的
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最大传输量，公司需要确定电话流量是和办公室电脑的数据流量不是在同一个网络上。以下 哪个是最好的网络设备，用来直连到电话和电脑，并且，哪种技术应该被配置在该设备上 A. hub B. router C. switch D. STP
E. subinterfaces F. VLAN Answer: CF
22. Refer to the exhibit. Which statement describes DLCI 17? 22.根据下图，那个选项描述了DLCI 17
A. DLCI 17 describes the ISDN circuit between R2 and R3. A.DLCI 17描述了R2和R3之间的ISDN线路
B. DLCI 17 describes a PVC on R2. It cannot be used on R3 or R1. B.DLCI 17描述了一条在R2上的PVC，不能用在R3和R1上
C. DLCI 17 is the Layer 2 address used by R2 to describe a PVC to R3. C.DLCI 17 是R2使用的二层地址，用来描述一条到R3的PVC
D. DLCI 17 describes the dial-up circuit from R2 and R3 to the service provider. D.DlDLCI17描述了一条从R2 R3到服务提供商拨号网络 Answer: C
23. Which routing protocol by default uses bandwidth and delay as metrics?
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23.哪个路由协议默认用带宽和延迟作为metrics值 A. RIP B. BGP C. OSPF D. EIGRP Answer: D
24. Refer to the output from the show running-config command in the exhibit. What should the administrator do to allow the workstations connected to the FastEthernet 0/0 interface to obtain an IP address?
24.根据下图中展示的show running-config命令的结果。网络管理员该如何做才能允许工作站 连接到FastEthernet 0/0接口去获得一个IP 地址
A. Apply access-group 14 to interface FastEthernet 0/0.
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