思科初级路由与交换知识测试

“路由和交换”自我水平测试评估（1级）

 

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1. 

WANs function at which two layers of the OSI model? (Choose two.)sessionnetworkphysicaltransportdata link1. 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

 

2. 

Which protocol routes between different autonomous systems?EGPIGPIPPIPXTCP2. 哪一协议能够在不同的自治系统之间进行路由？

         EGP

 

         IGP

 

         IPP

 

         IPX

 

         TCP

 

3. 

How many twisted pairs of wires are typically used in a leased line between two routers?two pairsthree pairsfive pairsfour pairs3. 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 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?WANLANEPASAN5. 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

 

         EPA

         SAN

 

6. 

 Which 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 possible6. 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 model provides translation of data?ApplicationPresentationSessionTransportdata link7. 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 used to represent the subnet?192.168.10.60192.168.10.47150.1.1.0192.168.10.548. 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？

 

         192.168.10.60

 

         192.168.10.47

         150.1.1.0

 

         192.168.10.54

 

9. 

What is the high-order bit pattern for a Class B network?01xxxxxx0xxxxxxx10xxxxxx110xxxxx9. Class B网络的高位模式是什么？

 

         01xxxxxx

 

         0xxxxxxx

 

         10xxxxxx

         110xxxxx

 

10. 

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 layer10. 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 are part of the TCP/IP protocol stack? (Choose two.)application layersession layerInternet layerpresentation layernetwork access layer11. 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.)DelayWeightDirectionhop 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

 

         MED

 

13. 

What is the high-order bit pattern for a Class A network?01xxxxxx111xxxxx10xxxxxx0xxxxxxx13. Class A网络的高位模式是什么？

 

         01xxxxxx

 

         111xxxxx

 

         10xxxxxx

         0xxxxxxx

 

14. 

Which of these best describes “flooding” as it refers to switches?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 forward 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 switch’s CAM table to become fully populated. 14. 以下那一项恰当地描述了交换机“泛洪”（flooding）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 ports?181624326415. 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？

 

         1

 

         8

         16

 

         24

 

         32

 

         64

 

16. 

How many frames can pass through a 24-port hub simultaneously, without causing a collision?OneTwoFourEight16. 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？

 

         1

 

         2

         4

 

         8

 

17. 

According to RFC 1918, which two of these addresses are considered private addresses? (Choose two.)10.12.21.118.24.7.245172.16.34.18172.47.88.89212.45.22.1217. 根据RFC 1918，以下哪两个地址属于私有地址？（选择两项。）

         10.12.21.1

 

         18.24.7.245

         172.16.34.18

 

         172.47.88.89

 

         212.45.22.12

 

18. 

What kind of physical interface does a router use to connect to a WAN link?Ethernethost bus adapterparallel interfaceserial interface18. 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 to19. 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 website 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 segments20. 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 routes 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 subnet21. 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-config22. 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 flash

 

         copy ftp flash

         load flash tftp

 

         copy flash ftp

 

         copy tftp startup-config

 

23. 

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?OneTwoFourEight23. 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? (Choose two.)RIPIPXIPOSPFbroadcast24. 以下哪两项属于路由协议？（选择两项。）

         RIP

 

         IPX

 

         IP

         OSPF

 

         广播

 

25. 

How many layers are in the OSI reference model?346725. OSI参考模型中有多少层？

 

         3

 

         4

 

         6

         7

 

26. 

The IP address 172.16.12.4 /26 has which subnet mask?255.0.0.0255.255.0.0255.255.255.0255.255.255.192255.255.255.22426. IP地址172.16.12.4/26采用哪一个子网掩码？

 

         255.0.0.0

 

         255.255.0.0

 

         255.255.255.0

         255.255.255.192

 

         255.255.255.224

 

27. 

Which term defines how many bits per second the service provider commits to pass over a single PVC?access rateBECNCIRFECNheader rate27. 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

 

         BECN

         CIR

 

         FECN

 

         标头速率

 

28. 

Which best describes unicast traffic?data 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 stream28. 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?BusTreeRingStar29. 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

 

30. 

Which two of these are key functions of routers? (Choose two.)provide packet forwardingprovide path determinationserve as end station connectivityprovide microsegementation for WAN links30. 以下哪两项属于路由器的主要功能？（选择两项。）

         提供数据包转发功能

         提供路径判断功能

 

         提供端点连接功能

 

         对广域网链路进行微分段

 

31. 

Which two of these are Class C addresses? (Choose two.)10.8.25.87172.16.24.45189.45.107.2192.168.1.7212.45.22.231. 以下哪两项属于Class C地址？（选择两项。）

 

         10.8.25.87

 

         172.16.24.45

         189.45.107.2

 

         192.168.1.7

         212.45.22.2

 

32. 

Frame Relay relays packets at which layer of the OSI model?Layer 1Layer 2Layer 3Layer 4Layer 632. 帧中继在OSI模型的哪一层传输数据包？

 

         第1层

 

         第2层

         第3层

 

         第4层

 

         第6层

 

33. 

Which four of these are WAN data-link layer protocols? (Choose four.)HDLCPPPFrame RelayATMpacket switchingleased linecell switching33. 以下哪四个属于广域网数据链路层协议？（选择四项。）

 

         HDLC

         PPP

         帧中继

         ATM

         分组交换

 

         专线

 

         信元交换