2022思科认证考试试题题库7篇.docx

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1、2022思科认证考试试题题库7篇2022思科认证考试试题题库7篇 第1篇 为查看配置注册表设置，你需要输入哪个命令（）A.show running-configB.show startup-configC.show versionD.show controllers正确答案：C The Ezonexam network administrator needs to a switch named VE1 to become the root bridge for a redundant path switched network. What can be done to ensure that

2、VE1 will always assume the role as the root bridge?AAssign the switch a higher MAC address than the other switches in the network haveBEstablish a direct link from the switch to all other switches in the networkCConfigure the switch full-duplex operation and configure the other switches for half-dup

3、lex operationDConfigure the switch so that it has lower priority than other switches in the networkENone of the above正确答案：D What value is primarily used to determine which port becomes the root port on each nonroot switch in a spanning-tree topology?A. path costB. lowest port MAC addressC. VTP revis

4、ion numberD. highest port priority numberE. port priority number and MAC addressF. None of the above正确答案：AA 解析：Explanation:At the conclusion of the root bridge election process, the switches move on to selecting Root Ports. The Root Port of a bridge is the port that is closest to the Root Bridge in

5、terms of Path Cost. Every non-Root Bridge must select one Root Port. Again, bridges use the concept of cost to measure closeness. As with some routing metrics, the measure of closeness using STP is not necessarily reflected by hop count. Specifically, bridges track what is referred to as Root Path C

6、ost, which is the cumulative cost of all links to the Root Bridge. You are given a PC, a router, and 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

7、port using a straight-through cable.B. Connect the PCs COM port to the routers console port using 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 t

8、he PCs Ethernet port to the routers Ethernet port using a straight- through cable.F. None of the above正确答案：BB 解析：Explanation:To connect the Router in Console port to configure using HyperTerminal, you required the Rollover Cable, which connects the PCs COM port to the routers Console port.Incorrect

9、Answers:A, C, E: Straight Cables are used for: Host to switch, Switch to Router.D: Rollover cables are used for Console/COM connections, not for IP traffic over theEthernet ports. 工作在OSI第三层的设备是：()A.网卡B.路由器C.交换机D.集线器正确答案：B 路由器“全局模式”的提示符为（）A.B.C.(config)D.(config-router)正确答案：C2022思科认证考试试题题库7篇 第2篇 You

10、have a network that supports VLSM and you need to reduce IP address waste in your point to point WAN links. Which of the masks below would you use?A. /38B. /30C. /27D. /23E. /18F. /32正确答案：BB 解析：Explanation:For a single point to point link, only 2 IP addresses are required, one for the serial interfa

11、ce of the router at each end. Therefore, the 255.255.255.252 subnet mask is often used for these types of links because no IP addresses are wasted. The subnet mask 255.255.255.252 is a /30, so answer B is correct.Incorrect Answers:A. The largest mask that can be used is the single IP host mask, whic

12、h is /32. It is not possible to use a /38 mask, unless of course IPv6 is being used.C, D, E. These masks will provide for a larger number of host addresses, and since only 2 IP addresses are needed for a point to point link, these extra addresses are wasted.F: No available host addresses with a /32

13、mask 两个VLAN之间要想通信，应该使用的设备是（）A.集线器B.二层交换机C.路由器D.PC机正确答案：C 下列静态路由配置正确的是()A.iproute 192.168.1.1 255.255.255.0 serial0/0B.iproute 192.168.1.0/24 172.16.1.1C.iproute 192.168.1.0 255.255.255.0172.16.1.0D.iproute 192.168.1.0 255.255.255.0172.16.1.1正确答案：D Which protocol automates all of the following functi

14、ons for hosts on a network: IP configuration, IP addresses, subnet masks, default gateways, and DNS server information?A. CDPB. SNMPC. DHCPD. ARPE. DNSF. None of the above正确答案：CC 解析：Explanation:DHCP uses the concept of the client making a request and the server supplying the IP address to the client

15、, plus other information such as the default gateway, subnet mask, DNS IP address, and other information.Incorrect Answers:A. CDP is the Cisco Discovery Protocol. It is used by Cisco devices at the data link layer to obtain information about their directly connected neighbors.B. SNMP is the Simple N

16、etwork Management Protocol. This is used for the maintenance, management, and monitoring of network devices.D. ARP is the Address Resolution Protocol, which is used to resolve layer 2 MAC addresses to layer 3 IP addresses.E. DNS is the Domain Name Service. It is used to resolve domain names (for exa

17、mple, ) to IP addresses. The IP address location of primary and secondary DNS resolver servers can be obtained for hosts using DHCP. 子网172.16.0.0/22有（）个可用的IP地址A.1022B.1024C.256D.254正确答案：A What is the subnet for the host IP address 172.16.210.0/22?A. 172.16.42.0B. 172.16.107.0C. 172.16.208.0D. 172.16

18、.252.0E. 172.16.254.0F. None of the above正确答案：CC 解析：Explanation:This question is much easier then it appears when you convert it to binary and do the Boolean operation as shown below:IP address 172.16.210.0 = 10101100.00010000.11010010.00000000/22 mask = 11111111.11111111.11111100.00000000AND result

19、 = 11111111.11111111.11010000.00000000AND in decimal= 172. 16. 208. 02022思科认证考试试题题库7篇 第3篇 You have set up an Internet based FTP server, where people can upload and download files. In terms of the OSI model, what is the highest layer used during the FTP sessions.A. ApplicationB. PresentationC. Sessio

20、nD. TransportE. InternetF. Data LinkG. Physical正确答案：AA 解析：Explanation:The application layer is the highest layer (layer 7) of the OSI model, and is reserved for end user applications. Since FTP is itself an application, layer 7 is the highest layer used.Incorrect Answers:B, C, D, E, F, G. In any giv

21、en FTP session, all of these layers will be used at some point but they are incorrect because the question asked for the highest layer used by FTP. CDP is being used throughout the Ezonexam network. What are two reasons why the Ezonexam network administrator would use CDP? (Choose two)A. To determin

22、e the status of network services on a remote deviceB. To obtain the IP Address of a connected device in order to telnet to the deviceC. To verify the type of cable interconnecting two devicesD. To verify Layer 2 connectivity between two devices when Layer 3 failsE. To obtain VLAN information from di

23、rectly connected swticehsF. To determine the status of the routing protocols between directly connected routersG. To support automatic network failover during outages正确答案：BDB,D 在大型网络中选择OSPF而不选择RIP的原因是（）A.更快的路由收敛B.需要更少的路由器内存C.需要更少的CPU的资源D.更优的选路，路由无环路正确答案：AD As a network administrator, you will need t

24、o decide on the appropriate network devices to use. Which of the following correctly describes the roles of devices in a WAN? (Choose three)A. A CSU/DSU terminates a digital local loop.B. A router is commonly considered a DCE device.C. A modem terminates an analog local loop.D. A router is commonly

25、considered a DTE device.E. A modem terminates a digital local loop.F. A CSU/DSU terminates an analog local loop.G. A modem is used to terminate a T1正确答案：ACDA,C,D 以下哪些答案列出了一个可用于标准编号IPACL的有效数字（）A.1987B.2187C.187D.87正确答案：AD VLAN主干协议VTP的默认工作模式是()A.服务器模式B.客户端模式C.透明模式D.以上三者都不是正确答案：A2022思科认证考试试题题库7篇 第4篇 St

26、udy the Exhibit below carefully:London#show vtpVTP Version: 2Configuration Revision: 0Maximum VLANs supported locally: 64Number of existing VLANs: 5VTP Operating Mode: ClientVTP Domain Name: LondonVTP Pruning Mode: DisabledVTP V2 Mode: DisabledVTP Traps Generation: DisabledBased on the information g

27、iven above, what is the VTP function of this particular switch?ALearn and save VTP configuration in the running configuration.BCreate and change VLANs.CForwards information about VTP configuration.DVTP is disabled on this device.EVTP is not saved to NVRAM.正确答案：C解析：Explanation:Fromtheoutputthisswitch

28、isoperatingmerelyasVTPclient,soitbasicallydoesastheVTPserversays,andpassesoninformationaboutVTPconfigurationtothenextswitchinline.IncorrectAnswers:A.Thisisincorrectbecausethefunctionisredundant.B.ThisincorrectbecausetheswitchmustbeinserverortransparentmodetocreateandchangeVLANs.D.Thisisincorrectbeca

29、useifVTPwouldbedisabled,itwouldntappearonthecommandoutput.E.Ifthisweretrue,theVTPconfigurationinformationwouldnotbedisplayedafterbeingpoweredon. RIP路由在()时间内没有收到更新会删除不可达路由()A.90sB.120sC.180sD.240s正确答案：D The Ezonexam network administrator needs to a switch named VE1 to become the root bridge for a red

30、undant path switched network. What can be done to ensure that VE1 will always assume the role as the root bridge?AAssign the switch a higher MAC address than the other switches in the network haveBEstablish a direct link from the switch to all other switches in the networkCConfigure the switch full-

31、duplex operation and configure the other switches for half-duplex operationDConfigure the switch so that it has lower priority than other switches in the networkENone of the above正确答案：D Which OSI layer header contains the address of a destination host that is on another network?A. ApplicationB. Pres

32、entationC. SessionD. TransportE. NetworkF. Data linkG. Physical正确答案：EE 解析：Explanation:Only network address contains this information. To transmit the packets the sender uses network address and datalink address. But the layer 2 address represents just the address of the next hop device on the way to

33、 the sender. It is changed on each hop. Network address remains the same. OSI七层模型中，数据链路层的数据封装名称为（）A.比特B.帧C.包D.段正确答案：B 路由器是网络边缘设备，工作在局域网和局域网之间。此题为判断题(对，错)。正确答案：2022思科认证考试试题题库7篇 第5篇 访问控制列表分为标准和扩展两种。下面关于ACL的描述中，错误的是()。A.标准ACL可以根据分组中的IP源地址进行过滤B.扩展ACL可以根据分组中的IP目标地址进行过滤C.标准ACL可以根据分组中的IP目标地址进行过滤D.扩展ACL可以根据

34、不同的上层协议信息进行过滤正确答案：C You are logged into a router and wish to view the layer 3 information about your neighboring Cisco routers. What IOS command gives layer 3 information for of the directly connected router interfaces?A. show ip linksB. show cdp neighborC. show cdp neighbor detailD. show ip clients

35、E. show ip routeF. None of the above正确答案：CC 解析：Explanation:To display detailed information about neighboring devices discovered using Cisco Discovery Protocol (CDP), use the show cdp neighbors privileged EXEC command.Detail - (Optional) Displays detailed information about a neighbor (or neighbors) i

36、ncluding network address, enabled protocols, hold time, and software version.Incorrect Answers:A, D. These are invalid commands.B. The show cdp neighbor command, without the detail keyword will not display the additional layer 3 protocol information.E. This will show all routes from all other router

37、s within the domain. We wish to see information from just the direct interface neighbors. 关于PPP和HDLC的说法中，错误的是（）A.PPP是通用协议，HDLC是CISCO私有协议B.PPP有验证功能，HDLC无验证功能C.PPP效率低，HDLC效率高D.在配置ISDN时，广域网协议不能封装成PPP，但可以封装成HDLC正确答案：D 路由器上的命令“show version”的功能是（）A.显示版本信息B.显示端口配置信息C.显示路由表D.显示路由协议信息正确答案：A 请参见图示两台路由器都使用RIPv

38、2路由协议，且未定义静态路由R1可以ping通192.168.2.1和10.1.1.2，但无法ping通192.168.4.1ping失败的原因是什么()A.R2的RIP配置中未通告192.168.4.0网络B.R2不会转发路由更新C.两台路由器之间的串行接口关闭D.需要配置RIPv1正确答案：A 下列哪一设备工作时，要用到OSI的七个层（一层到七层）（）A.PCB.网管机C.WEB服务器D.交换机E.路由器正确答案：ABC2022思科认证考试试题题库7篇 第6篇 下图中如果允许192.168.1.0/24和10.0.0.0/8的网络之间通信，必须要配置的两条命令是什么()A.A(config

39、)iproute 10.0.0.0 255.0.0.0 172.16.40.2B.A(config)iproute 10.0.0.0 255.0.0.0 S0/0/0C.A(config)iproute 10.0.0.0 255.0.0.0 10.0.0.1D.B(config)iproute 192.168.1.0 255.255.255.0 172.16.40.1E.B(config)iproute 192.168.1.0 255.255.255.0 172.16.40.2F.Biproute 192.168.1.0 255.255.255.0 192.168.1.1正确答案：AD Whi

40、ch of the following components must be elected before the Spanning Tree Protocol can converge in a switched LAN?A. Designated ports.B. Duplex operating mode.C. Fast mode ports.D. Root bridge.E. Root ports.F. BDPU priority.正确答案：ADEA,D,E 解析：Explanation:Designated port: Either a root port or a port tha

41、t has been determined as having the best (lower) cost-a designated port will be marked as a forwarding port. Root bridge: The root bridge is the bridge with the best bridge ID. With STP, the key is for all the switches in the network to elect a root bridge that becomes the focal point in the network

42、. All other decisions in the network-like which port is to be blocked and which port is to be put in forwarding mode-are made from the perspective of this root bridge. Root port: Always the link directly connected to the root bridge, or the shortest path to the root bridge. If more than one link con

43、nects to the root bridge, then a port cost is determined by checking the bandwidth of each link. The lowest cost port becomes the root port. So these three components must be elected before the spanning tree protocol can converge in a switched LAN 请参见图示。公司的新安全策略允许来自工程部LAN的所有IP流量访问Internet，但对于来自营销部LA

44、N的流量，则只允许其中的web流量访问Internet。为实施新的安全策略，可在营销部路由器的Serial0/1接口的出站方向上应用哪一ACL()A.access-list 197 permit ip 192.0.2.0 0.0.0.255 any access-list 197 permit ip 198.18.112.0 0.0.0.255 any eq wwwB.access-list 165 permit ip 192.0.2.0 0.0.0.255 any access-list 165 permit tcp 198.18.112.0 0.0.0.255 any eq www acc

45、ess-list 165 permit ip any anyC.access-list 137 permit ip 192.0.2.0 0.0.0.255 any access-list 137 permit tcp 198.18.112.0 0.0.0.255 any eq wwwD.access-list 89 permit 192.0.2.0 0.0.0.255 any access-list 89 permit tcp 198.18.112.0 0.0.0.255 any eq www正确答案：C 下面有关交换机的描述中，正确的是（）A.所有交换机都支持VLAN功能B.交换机端口数量最

46、多为48口C.交换机独占带宽D.交换机端口的最大速率为100Mbit/s正确答案：C A receiving host has failed to receive all of the segments that it should acknowledge.What can the host do to improve the reliability of this communication session?AStart a new session using UDPBObtain a new IP address from the DHCP serverCUse a different s

47、ource port for the sessionDDecrease the sequence numberEDecrease the window size正确答案：E解析：Explanation:A TCP window the amount of outstanding (unacknowledged by the recipient) data a sender can send on a particular connection before it gets an acknowledgment back from the receiver that it has gotten some of it.For example if a pair of hosts are talking