“路由和交换”自我水平测试评估

1、“路由和交换”自我水平测试评估窗体顶端Please answer question 1 before continuing.Please select exactly 2 choices to question 1.1. WANs function at which two layers of the OSI model? (Choose two.)sessionnetworkphysicaltransportdata link 1. 广域网在OSI模型的哪两层上发挥作用？（选择两项。) 会话层网络层物理层传输层数据链路层窗体底端2. Which protocol routes between

2、 different autonomous systems?EGPIGPIPPIPXTCP2. 哪一协议能够在不同的自治系统之间进行路由？ EGPIGPIPPIPXTCP3. How many twisted pairs of wires are typically used in a leased line between two routers?two pairsthree pairsfive pairsfour pairs 3. 两台路由器直接用双绞线直连时，需要多少对线缆传输数据？ 两对三对五对四对4. Which two layers of the OSI model do the

3、TCP/IP protocols operate at? (Choose two.)networkphysicaltransportdata link4. TCP/IP协议运行在OSI模型上的哪两层？ （选择两项。） 网络层物理层传输层数据链路层5. Your company has routers in San Jose and Raleigh. What type of network would connect these routers?WANLANEPASAN 5. 您的公司在圣何塞和罗利部署有路由器。使用哪种网络才能够将这些路由器连接在一起？ 广域网局域网EPASAN6. Whic

4、h approach eliminates loops when multiple switches are implemented in a network?MicrosegmentationSpanning Tree Protocolinstalling a router between switchesonly use one switch whenever a loop is possible 6. 当一个网络中部署了多台交换机时，哪一种方法能够消除循环？ 微分段生成树协议在交换机间安装路由器在可能出现循环时，仅使用一个交换机7. Which layer of the OSI mode

5、l provides translation of data?ApplicationPresentationSessionTransportdata link 7. OSI模型的哪一层负责数据转换工作？ 应用层表示层会话层传输层数据链路层8. All hosts on a particular LAN segment use IP addresses that begin with 150.1.1. Subnetting is being used, and treats the first three octets as the subnet. Which subnet number is

6、used to represent the subnet?074 8. 一个特定局域网段上的所有主机均使用了150.1.1开头的IP地址，并启用了子网划分功能，将前三个八位位组视为子网。哪一个子网编号将用于代表这一子网？ 0749. What is the high-order bit pattern for a Class B network?01xxxxxx0xxxxxxx10xxxxxx110xxxxx 9.

7、Class B网络的高位模式是什么？ 01xxxxxx0xxxxxxx10xxxxxx110xxxxx10. Which of these is a layer in the OSI model but is not part of the TCP/IP protocol stack?physical layerdata link layernetwork layertransport layerpresentation layer 10. 以下哪一个是OSI模型中的一层，但不是TCP/IP协议堆栈的一部分？ 物理层数据链路层网络层传输层表示层11. Which two of these ar

8、e part of the TCP/IP protocol stack? (Choose two.)application layersession layerInternet layerpresentation layernetwork access layer 11. 以下哪两项是TCP/IP协议堆栈的一部分？ （选择两项。） 应用层会话层互联网层表示层网络接入层12. During path selection, which three of these metrics may be used by routing protocols? (Choose three.)DelayWeigh

9、tDirectionhop countBandwidthMED 12. 在路径选择过程中，路由协议可能会使用这些标准中的哪三个？ （选择三项。） 延迟权重方向跳数带宽MED13. What is the high-order bit pattern for a Class A network?01xxxxxx111xxxxx10xxxxxx0xxxxxxx 13. Class A网络的高位模式是什么？ 01xxxxxx111xxxxx10xxxxxx0xxxxxxx14. Which of these best describes “flooding” as it refers to swit

10、ches?If the switch does not have an entry for the destination address, it will transmit the frame out of all ports except the port on which it received the frame.If the switch determines that the destination MAC address of the frame resides on the same network segment as the source, it does not forw

11、ard the frame.If the switch determines that the destination MAC address of the frame is not from the same network as the source, it transmits the frame to the appropriate segment.When a denial of service attack occurs, it causes a switchs CAM table to become fully populated. 14. 以下那一项恰当地描述了交换机“泛洪”（f

12、looding）操作？ 如果交换机中没有针对目标地址的记录，它将向所有端口传输该数据帧，数据帧的来源端口除外。如果交换机确定数据帧的目标MAC地址位于同来源端口相同的网段，它不会转发数据帧。如果交换机确定数据帧的目标MAC地址与来源端口的网络不同，它将向相关网段传输该数据帧。当拒绝服务攻击发生时，它会导致交换机的CAM表被写满。15. How many frames can pass through a 24-port switch simultaneously, without causing a collision and with full duplex used on all port

13、s?1816243264 15. 在一个24端口交换机上，当所有端口均启用全双工支持时，在不产生冲突的情况下最多可以同时通过多少个帧？ 181624326416. How many frames can pass through a 24-port hub simultaneously, without causing a collision?OneTwoFourEight 16. 在不产生冲突的情况下，一个24端口集线器能够同时通过多少个帧？ 124817. According to RFC 1918, which two of these addresses are considered

14、private addresses? (Choose two.)45892 17. 根据RFC 1918，以下哪两个地址属于私有地址？ （选择两项。） 4589218. What kind of physical interface does a router use to connect to a WAN link?Ethernethost bus adapterparallel int

15、erfaceserial interface 18. 路由器使用哪一类物理接口与广域网链路进行连接？ 以太网主机总线适配器并行接口串行接口19. How many TCP segments flow between two computers to establish a TCP connection?OneTwoThreeFivedepends on what the TCP window size is set to 19. 两台计算机之间需要传输多少TCP段才能建立一个TCP连接？ 一个两个三个五个取决于设定的TCP窗口大小20. Imagine that you visit a web

16、site and download a graphic image called logo.gif. The logo is 4000 bytes. Assuming an MSS of 1480 bytes, how many segments will the server send back to your browser to send you the logo?2 segments3 segments4 segments5 segments10 segments 20. 假设您正在访问一个网站，要下载一个名为logo.gif的图片。该标识的大小为4,000字节。假定MSS值为1480

17、字节，服务器需要向您的浏览器返回多少个片段以向您发送该标识？ 2个片段3个片段4个片段5个片段10个片段21. Router R4 has two working Ethernet interfaces, and each interface has been configured with an IP address. What is the minimum number of routes that R4 should have in its routing table?one route split between each directly connected subnettwo ro

18、utes for each directly connected subnettwo routes, one for each directly connected subnetfour routes, two for each directly connected subnetsix routes, two for each directly connected subnet 21. 路由器R4有两个以太网接口正在工作，每一个接口均配置有IP地址。R4在其路由表中至少需具备多少个路由？ 一个路由，针对每一个直接连接的子网进行拆分两个路由，用于支持所有直接连接的子网两个路由，每一个直接连接的子

19、网一个四个路由，每一个直接连接的子网两个六个路由，每一个直接连接的子网两个22. Which of these commands can be used to load a new version of Cisco IOS software onto a router?copy tftp flashcopy ftp flashload flash tftpcopy flash ftpcopy tftp startup-config 22. 以下哪一命令可用于在路由器上加载新版本的Cisco IOS软件？ copy tftp flashcopy ftp flashload flash tftpc

20、opy flash ftpcopy tftp startup-config23. How many wires are needed for a PC to successfully send data to and receive data from another PC using an Ethernet LAN cable with RJ-45 connectors?OneTwoFourEight 23. 在以太网线缆中使用的RJ-45接头需要用多少根线才能实现数据的收发？ 一条两条四条八条24. Which two of these are routing protocols? (Ch

21、oose two.)RIPIPXIPOSPFbroadcast 24. 以下哪两项属于路由协议？ （选择两项。） RIPIPXIPOSPF广播25. How many layers are in the OSI reference model?3467 25. OSI参考模型中有多少层？ 346726. The IP address /26 has which subnet mask?9224 26. IP地址/26采用哪一个子网掩

22、码？ 922427. Which term defines how many bits per second the service provider commits to pass over a single PVC?access rateBECNCIRFECNheader rate 27. 哪一个术语定义了电信运营商承诺每秒通过单个PVC的字节数？ 访问速率BECNCIRFECN标头速率28. Which best describes unicast traffic?dat

23、a traffic that is sent to one devicedata traffic that is sent to all devices in the same VLANdata traffic that is redistributed from an external ASdata traffic sent to routers that are configured to receive the same data stream 28. 哪一选项恰当地描述了单播流量？ 被发送到一个设备的数据流量被发送到同一VLAN中所有设备的数据流量通过外部AS重新分发的数据流量发送到配置用来接收相同数据流的路由器的数据流量29. Which topology uses a central device for point-to-point connections to other devices?BusTreeRingStar 29. 哪一种拓扑结构采用了中央设备来为其他设备提供点对点连接？ 总线型树型环型星型