思科认证CCNA认证试题与答案中文版
思科认证CCNA认证试题和答案中文版
思科认证CCNA认证试题和答案中文版思科认证CCNA认证试题和答案中文版想要获得思科认证，首先要参加由思科推荐并授权的培训中心(Cisco Training Partner，简称CTP)所开设的培训课程。
完成学业后再到由全球考试机构Sylvan Prometric授权的.考试中心参加由思科指定的科目的认证考试。
通过指定的系列科目考试后，学员就可以获得相应分支系列等级的资格认证。
下面是店铺为大家搜集的相关试题，供大家参考练习。
16、路由器A串口0配置如下interface serial0link-protocol pppppp pap local-user huawei password simple quidwayip address 2.2.2.1 255.0.0.0路由器B串口及全局配置如下local-user huawei service-type ppp password simple quidway!interface serial0link-protocol pppppp authentication-mode papip address 2.2.2.2 255.0.0.0当两台路由器串口0相连时，两台路由器是否可以连接到对端()(A) 能(B) 不能答案：A17、关于千兆以太网，以下说法正确的是( )(A) IEEE802.3ab定义了千兆以太网(B) 在同一冲突域中，千兆以太网不允许中继器的互连(C) IEEE802.3z专门定义了千兆以太网在双绞线上的传输标准(D) 千兆以太网支持网络速率的自适应，可以与快速以太网自动协商传输速率答案：AB参考知识点：华为3com认证教材第一册3-8页18、高层的协议将数据传递到网络层后，形成( )，而后传送到数据链路层(A) 数据帧(B) 信元(C) 数据包(D) 数据段答案：C参考知识点：华为3com认证教材第一册1-20页19、在路由器上配置帧中继静态map必须指定( )参数(A) 本地的DLCI(B) 对端的DLCI(C) 本地的协议地址(D) 对端的协议地址答案：AD20、路由器的主要性能指标不包括( )(A) 延迟(B) 流通量(C) 帧丢失率(D) 语音数据压缩比答案：D【思科认证CCNA认证试题和答案中文版】。
思科认证CCNA认证试题与答案中文版
答案：D 注释:这个题目不是太严谨,应该加上子网掩码. A:224. 0. 0. 5 是多播地址 B: 127. 0.0. 0 保留作为测试使用 C:网络地址 26、 设置主接口由 up 转 down 后延迟 30 秒切换到备份接口，主 接口 由 down 转 up 后 60 秒钟切换回主接口的配置为()
忍一句，息一怒，饶一着，退一步。——《增广贤文》
人之为学，不日进则日退，独学无友，则孤陋而难成；久处一方，则习染而不自觉。——《顾炎武》
答案：D 注释:255. 255. 255. 255 是全网广播,DHCP 客户端发送全网广播来 查 找 DHCP 服务器. 24、 下而有关 NAT 叙述正确的是() (A) NAT 是英文“地址转换”的缩写，又称地址翻译 (B) XAT 用来实现私有地址与公用网络地址之间的转换 (C) 当内部网络的主机访问外部网络的时候，一定不需要 NAT (D) 地址转换的提出为解决 IP 地址紧张的问题提供了一个有效途 径 答案:ABD 25、 以下属于正确的主机的 IP 地址的是()
(A) arp-a (B) traceroute (C) routeprint (D) displayiprouting-table
答案：D 23、 D0. 0. 0 (B) 10. 0. 0. 1 (0127. 0. 0. 1 (D)255. 255. 255. 255
192. 168. 1. 1
答案：D 注释:PC 的'默认网关要指向路由器的以太网口的 IP 地址. 28、 ISDNB 信道速率是()
(A) 16kbps (B) 64kbps
CCN认证试题中文答案
C C N A认证试题一（附答案和解析）中文版(一)1、目前，我国应用最为广泛的LAN标准是基于（）的以太网标准.(A) IEEE 802.1(B) IEEE 802.2(C) IEEE 802.3(D) IEEE 802.5答案：C参考知识点：现有标准：IEEE 802.1 局域网协议高层IEEE 802.2 逻辑链路控制IEEE 802.3 以太网IEEE 802.4 令牌总线IEEE 802.5 令牌环IEEE 802.8 FDDIIEEE 802.11 无线局域网记住IEEE802.1-------IEEE802.5的定义以太网是一种计算机局域网组网技术。
IEEE制定的IEEE 802.3标准给出了以太网的技术标准。
它规定了包括物理层的连线、电信号和介质访问层协议的内容。
以太网是当前应用最普遍的局域网技术。
它很大程度上取代了其他局域网标准，如令牌环、FDDI和ARCNET。
以太网的标准拓扑结构为总线型拓扑，但目前的快速以太网（100BASE-T、1000BASE-T标准）为了最大程度的减少冲突，最大程度的提高网络速度和使用效率，使用交换机（Switch）来进行网络连接和组织，这样，以太网的拓扑结构就成了星型，但在逻辑上，以太网仍然使用总线型拓扑的C***A/CD介质访问控制方法。
电气电子工程师协会或IEEE（Institute of Electrical and Electronics Engineers）是一个国际性的电子技术与信息科学工程师的协会。
建会于1963年1月1日。
总部在美国纽约市。
在150多个国家中它拥有300多个地方分会。
目前会员数是36万。
专业上它有35个专业学会和两个联合会。
IEEE发表多种杂志，学报，书籍和每年组织300多次专业会议。
IEEE定义的标准在工业界有极大的影响。
下面列出：IEEE802．3以太网标准802.3--------- 10Base以太网标准802.3u-------- 100Base-T（快速以太网）802.3z-------- 1000Base-X（光纤吉比特以太网）802.3ab-------- 1000Base-T（双绞线吉比特以太网）答案：CE注：IP地址中关键是看她的主机位，将子网掩码划为二进制，1对应上3、Quidway系列路由器在执行数据包转发时，下列哪些项没有发生变化（假定没有使用地址转换技术）？（）(A) 源端口号(B) 目的端口号(C) 源网络地址(D) 目的网络地址(E) 源MAC地址(F) 目的MAC地址答案：ABCD参考知识点：路由功能就是指选择一条从源网络到目的网络的路径，并进行数据包的转发。
CCNA认证基础试卷A-参考答案
1 CCNA认证基础考卷参考答案（A卷）考试时间年月日(120分钟) 课程CCNA基础教师签名_____一、选择题（每题2分，共30分）二、名词解释（每题2分，共10分）三、简单题（每题15分，共60分）1、答：2、答：物理拓扑是指介质的实际布局。
常见的物理拓扑有总线型、环形、星型、扩展星型、树型、网状等逻辑拓扑是指主机访问介质的方法。
常见的有总线型和令牌环型。
3、答UTP线缆分为直连线、交叉线、全反线直连线按照568B的线序标准应该是两端相同，都为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，一般用于主机到交换机、主机到集线器、路由器到交换机、路由器到集线器等。
交叉线按照568B的线序标准应该是两端的1-3、2-6交叉，一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，另一端为白绿、绿、白橙、蓝、白蓝、橙、白棕、棕；一般用于同样类型的两台设备直连一级集线器到交换机，主机到路由器的连接。
全反线的线序为两端线序完全相反，一端为白橙、橙、白绿、蓝、白蓝、绿、白棕、棕，另一端则线序全部相反，为棕、白棕、绿、白蓝、蓝、白绿、橙、白橙。
全反线只用于计算机的串口与网络设备的控制台端口连接。
4、答：相同点：1)路由器和第3层交换机都是第3层的设备2)路由器和第3层交换机都具有路由功能3)路由器和第3层交换机都能够提供子网（或VLAN）间的通信4)路由器和第3层交换机都主要用于主干网上不同点：1)接口工作层次：路由器的接口只工作在第3层（路由接口）上，第3层交换机的接口可独自工作在第2层（交换接口）或第3层（路由接口）上。
2)软硬件实现：路由器是基于软件的路由设备，第3层交换机是硬件化的路由设备3)转发性能：路由器实现高转发性能的代价远高于第3层交换机4)接口类型：路由器的接口类型远丰富于第3层交换机5)路由能力：路由器的路由能力强大，第3层交换机的路由能力只需满足一般需要即可。
（路由协议、转发机制）6)应用场合：广域主干网中一般使用路由器，园区主干网中通常使用第3层交换机一、填空(每空2分，共20分)1如图所示，路由器A和B已经配置使用RIP作为动态路由协议，且路由器A和B上的所有接口都报告“interface is up, line protocol is up”。
思科CCNA考证习题答案
1. what could be possible causes for the "Serial0/0 is down"interface status? 这可能是为“Serial0 / 0的可能原因是向下”接口的状态？TWOA.a layer 1 problem exists.1层存在问题D.an incorrect cable is being used。
2.before installing a new,upgraded version of the ios,what should be checked on the router,and which command should be used to gather this information?在安装一个新的，升级的IOS版本，应该怎样检查路由器上，并命令应该被用来收集这些资料？B.the amount of avaiable flash and ram 缴费的闪存和RAM的数量D.show version 显示版本3.refer to the exhibit. which two statements are true about inter VLAN routing in the topology that is shown in the exhibit?（choose two）指展览。
这两个语句是对国际米兰的是在展会上展出的拓扑路由的VLAN是否属实？D. the FastEthernet 0/0 inerface on router1 must be configured with subinterfaces.关于路由器1的在FastEthernet 0/0 inerface 必须配置子接口F.the FastEthernet 0/0 interface on router1 and switch2 trunk ports must be configured using the same encapsulation type. 对在FastEthernet 0/0 接口上路由器1和交换器2中继端口必须配置使用相同的封装类型。
思科CCNA题目及答案
CCNA-Cisco-Chapter11C11 An electrician has investigated your recent power problems and has suggested that they are caused by oscillation. What is the BEST solution to your problem?Move the network server to another roomReplace UTP with fiber optic cable* Rewire the electrical systemFit commercial surge suppressors2 What is another term that can be used to describe an Intermediate Distribution Frame (IDF)? work area (WA)telecommunications outlet (TO)main cross-connect (MCC)* horizontal cross-connect (HCC)3 Why is fiber optic cable commonly used as a network backbone between campus buildings?It provides a less resistive path for electrical current to flow from one building to anotherIt enhances the signals at the physical layer* It reduces the hazardous effects of electrical potential difference and lightning strikesIt is cheaper and easier to install than copper wire4 Which of the following environmental specifications are recommended for a wiring closet ? Carpeted floor; tiled walls and an inward opening doorWooden floor; brick walls and fluorescent lightingTiled floor; internal power outlets and a dropped ceiling* Raised floor; wood covered walls and an internal light switch5 What is one of the most significant causes of oscillatory noise problems on a power circuit? ??? Long wiring runsSchool photocopiersLocating power cables in elevator shaftsAir conditioners cycling on and off6 What device is best used to minimize the effects of power line sags and brownouts?A primary protection deviceA surge suppressorAn optical isolator* An uninterruptible power supply7 What causes Electrostatic Discharge (ESD)?Long power linesFaulty electrical equipment* An accumulation of static electricityAn increase in atmospheric humidity8 Which of the following problems is caused by too high a humidity level in a wiring closet? Signal degradation* Copper wire corrosionInsulation failurePower surges9 What is the ideal room temperature and relative humidity at which a wiring closet should bemaintained?* 21 degrees Celsius / 45 % relative humidity21 degrees Fahrenheit / 45 % relative humidity45 degrees Celsius / 21 % relative humidity45 degrees Fahrenheit / 21 % relative humidity10 What is the maximum length specified for 62.5/125µm multimode optical fiber run between the MDF and IDF?90 m800 m2000 m* 3000 m11 What are the three components that make up an uninterruptible power supply?* A battery, inverter and battery chargerA MOV, capacitor and diodeA generator, changeover circuit and server softwareA circuit breaker, fuse and battery12 Where does the horizontal cable extend?From the main distribution frame in the wiring closet to the vertical cross connect in the intermediate distribution frameFrom the telecommunications outlet in the work area to the horizontal cross-connect in the telecommunications closet* From the patch panel in the point of presence to the backbone connection in the customer premises equipmentFrom the telecommunications outlet in the wiring closet to the conduit in the intermediate distribution frame13 Which statement BEST describes the current flow in an electrical circuit with a DC source?* It is constant over timeIt varies over timeIt increases with timeIt decreases with time14 Why are exposed metal components normally connected to the ground, or earth, pin of a power outlet?The connection is needed to increase the resistance of the circuit to ground* If an electrical fault occurs in the equipment, the connection will reduce the chance of shock Connecting the metal to ground makes it act like an insulatorThe ground connection can act as an alternative path for controlled current flow if the neutral wire is disconnected15 What is the term used to describe a problem in an electrical system between the hot, or live, wire and the neutral wire?An isolated mode problemA ground fault problem* A common mode problemA normal mode problem16 What function does an electrical insulator perform?It completes the circuit, allowing current to flowIt reduces the resistance in an electrical circuitIt allows a short circuit to be present* It prevents uncontrolled current flow17 What is an alternative name for backbone cabling?Horizontal cabling* Vertical cablingMain cablingTrunk cabling18 Why can digital electronic equipment, such as a computer, malfunction if subjected to excessive power line noise?Logic gates are unable to correctly distinguish the noise polarityThe noise enhances the digital signal edgesThe noise replaces the digital signal* Logic gates are unable to correctly distinguish between a one and a zero19 A potential wiring closet has been identified in a building with a floor area of 930 sq. m. The distance from this closet to the furthest workstation is 127 m. How many ADDITIONAL wiring closets would need to be installed?* 012820 Why is copper considered a good conductor of electricity?* It offers a path of least resistance to current flowIt is easily formed into wiresIt is cheaper than other metalsIt reduces power line noise21 In a controlled electrical circuit, which path do electrons normally follow?From the positively charged source to ground* From the negatively charged source to a positively charged sourceFrom the more positively charged source to the less positively charged sourceFrom the negatively charged source to ground22 What is the purpose of providing a ground, or earth, connection on a wall power outlet?To reduce the resistance in the electrical circuitTo link the neutral wire to ground* To allow fault currents to flow to groundTo complete the circuit for normal current to flow23 What is a possible problem associated with multiple building grounds?They are often at the same potential with respect to each otherThey do not allow electrical current to flow between the buildingsSeparate protective devices are needed at each building* They may present a shock hazard due to different potentials24 What features should be considered when assessing a potential wiring closet?It should be secure and situated on the first (ground) floor???? It should be secure and close to the POPIt should be within 150 m of the MDF and close to an entranceIt should be an internal room and close to the electrical supply distributionC21. Which statements correctly identify the role of intermediary devices in the network? (Choose three.)determine pathways for datainitiate data communicationsretime and retransmit data signalsoriginate the flow of datamanage data flowsfinal termination point for data flow2. Select the statements that are correct concerning network protocols. (Choose three.) define the structure of layer specific PDU'sdictate how to accomplish layer functionsoutline the functions necessary for communications between layerslimit the need for hardware compatibilityrequire layer dependent encapsulationseliminate standardization among vendors3. What are two functions of encapsulation? (Choose two.)tracks delay between end devicesenables consistent network paths for communicationallows modification of the original data before transmissionidentifies pieces of data as part of the same communicationensures that data pieces can be directed to the correct receiving end device4. What is a primary function of the trailer information added by the data link layer encapsulation?supports error detectionensures ordered arrival of dataprovides delivery to correct destinationidentifies the devices on the local networkassists intermediary devices with processing and path selection5. Which statements correctly identify the role of intermediary devices in the network? (Choose three.)determine pathways for datainitiate data communicationsretime and retransmit data signalsoriginate the flow of datamanage data flowsfinal termination point for data flow6. What is a PDU?corruption of a frame during transmissiondata reassembled at the destinationretransmitted packets due to lost communicationa layer specific encapsulation7. Which characteristic correctly refers to end devices in a network?manage data flowsoriginate data flowretime and retransmit data signalsdetermine pathways for data10. Which three statements best describe a Local Area Network (LAN)? (Choose three.)A LAN is usually in a single geographical area.The network is administered by a single organization.The connection between segments in the LAN is usually through a leased connection. The security and access control of the network are controlled by a service provider.A LAN provides network services and access to applications for users within a common organization.Each end of the network is generally connected to a Telecommunication Service Provider (TSP).12. What is the primary purpose of Layer 4 port assignment?to identify devices on the local mediato identify the hops between source and destinationto identify to the intermediary devices the best path through the networkto identify the source and destination end devices that are communicatingto identify the processes or services that are communicating within the end devices13. What device is considered an intermediary device?file serverIP phonelaptopprinterswitch16. Which layer encapsulates the segment into packets?physicaldata linknetworktransport17. What can be identified by examining the network layer header?the destination device on the local mediathe destination host addressthe bits that will be transferred over the mediathe source application or process creating the data18. What is the purpose of the TCP/IP Network Access layer?path determination and packet switchingdata presentationreliability, flow control, and error detectionnetwork media controlthe division of segments into packets19. During the encapsulation process, what occurs at the data link layer?No address is added.The logical address is added.The physical address is added.The process port number is added.21. What is the proper order of the layers of the OSI model from the highest layer to the lowest layer?4physical, network, application, data link, presentation, session, transport application, physical, session, transport, network, data link, presentation application, presentation, physical, session, data link, transport, network application, presentation, session, transport, network, data link, physical presentation, data link, session, transport, network, physical, application22. Which two layers of the OSI model have the same functions as the TCP/IP model Network Access Layer? (Choose two.)34NetworkTransportPhysicalData LinkSessionC31 How does the application layer on a server usually process multiple client request for services?ceases all connections to the servicedenies multiple connections to a single daemonsuspends the current connection to allow the new connectionuses support from lower layer functions to distinguish between connections to the service2 A small home network has been installed to interconnect three computers together for gaming and file sharing. What two properties represent this network type? (Choose two.)User accounts are centralized.Security is difficult to enforce.Specialized operating system software is required.File permissions are controlled by a single computer.A computer that responds to a file sharing request is functioning as a server.3 What is the purpose of resource records in DNS?temporarily holds resolved entriesused by the server to resolve namessent by the client to during a querypasses authentication information between the server and client4 A network administrator is designing a network for a new branch office of twenty-five users. What are the advantages of using a client-server model? (Choose two.)centralized administrationdoes not require specialized softwaresecurity is easier to enforcelower cost implementationprovides a single point of failure5 What are three properties of peer-to-peer applications? (Choose three.)acts as both a client and server within the same communicationrequires centralized account administrationhybrid mode includes a centralized directory of filescan be used in client-server networksrequires a direct physical connection between devicescentralized authentication is required6 As compared to SSH, what is the primary disadvantage of telnet?not widely availabledoes not support encryptionconsumes more network bandwidthdoes not support authentication7 What is the automated service that matches resource names with the required IP address?HTTPSSHFQDNDNSTelnetSMTP8 What application layer protocol describes the services that are used for file sharing in Microsoft networks?DHCPDNSSMBSMTPTelnet9 Which two protocols are used to control the transfer of web resources from a web server to a client browser? (Choose two.)ASPFTPHTMLHTTPHTTPSIP10 What three protocols operate at the Application layer of the OSI model? (Choose three.)ARPDNSPPPSMTPPOPICMP11 Which layer of the OSI model supplies services that allow user to interface with the network?physicalsessionnetworkpresentationapplicationtransport12 Which email components are used to forward mail between servers? (Choose two.) MDAIMAPMTAPOPSMTPMUA13 What are two forms of application layer software? (Choose two.)applicationsdialogsrequestsservicessyntax14 Which statements are correct concerning the role of the MTA in handling email? (Choose three.)routes email to the MDA on other serversreceives email from the client's MUAreceives email via the POP3 protocolpasses email to the MDA for final deliveryuses SMTP to route email between serversdelivers email to clients via the POP3 protocol15 What are two characteristics of clients in data networks? (Choose two.)use daemonsinitiate data exchangesare repositories of datamay upload data to serverslisten for requests from servers16 What is the role of the OSI application layer?provides segmentation of dataprovides encryption and conversion of dataprovides the interface between the applications on either end of the network provides control of all the data flowing between the source and destination devices 17 Which application layer protocols correctly match a corresponding function? (Choose two.)DNS dynamically allocates IP addresses to hostsHTTP transfers data from a web server to a clientPOP delivers email from the client to the server email serverSMTP supports file sharingTelnet provides a virtual connection for remote access19 What are two characteristics of peer-to-peer networks? (Choose two.) scalableone way data flowdecentralized resourcescentralized user accountsresource sharing without a dedicated server20 What application layer protocol is commonly used to support for file transfers between a client and a server?HTMLHTTPFTPTelnetC42. With TCP/IP data encapsulation, which range of port numbers identifies all well-known applications?0 to 255256 to 10220 to 10231024 to 204749153 to 655353. Why are port numbers included in the TCP header of a segment?to indicate the correct router interface that should be used to forward a segmentto identify which switch ports should receive or forward the segmentto determine which Layer 3 protocol should be used to encapsulate the datato enable a receiving host to forward the data to the appropriate applicationto allow the receiving host to assemble the packet in the proper order4. Which OSI model layer is responsible for regulating the flow of information from source to destination, reliably and accurately?applicationpresentationsessiontransportnetwork6. Why is flow control used for TCP data transfer?to synchronize equipment speed for sent datato synchronize and order sequence numbers so data is sent in complete numerical orderto prevent the receiver from being overwhelmed by incoming datato synchronize window size on the serverto simplify data transfer to multiple hosts7. Which two options represent Layer 4 addressing? (Choose two.)identifies the destination networkidentifies source and destination hostsidentifies the communicating applicationsidentifies multiple conversations between the hostsidentifies the devices communicating over the local media10. What is dynamically selected by the source host when forwarding data? destination logical addresssource physical addressdefault gateway addresssource port11. What are two features of the User Datagram Protocol (UDP)? (Choose two.) flow controllow overheadconnectionlessconnection-orientedsequence and acknowledgements12. What mechanism is used by TCP to provide flow control as segments travel from source to destination?sequence numberssession establishmentwindow sizeacknowledgments13. Which transport layer protocol provides low overhead and would be used for applications which do not require reliable data delivery?TCPIPUDPHTTPDNS14. Which information is found in both the TCP and UDP header information? sequencingflow controlacknowledgmentssource and destination port15. Which three features allow TCP to reliably and accurately track the transmission of data from source to destination? (Choose three.)flow controlurgent pointerbest effort deliverysession establishmentconnectionless servicesnumbering and sequencing16. During a TCP communication session, if the packets arrive to the destination out of order, what will happen to the original message?The packets will not be delivered.The packets will be retransmitted from the source.The packets will be delivered and reassembled at the destination.The packets will be delivered and not reassembled at the destination.17. Which is an important characteristic of UDP?acknowledgement of data deliveryminimal delays in data deliveryhigh reliability of data deliverysame order data delivery18. After a web browser makes a request to a web server that is listening to the standard port, what will be the source port number in the TCP header of the response from the server?1353801024172819. Which event occurs during the transport layer three-way handshake?The two applications exchange data.TCP initializes the sequence numbers for the sessions.UDP establishes the maximum number of bytes to be sent.The server acknowledges the bytes of data received from the client.C51 What is the purpose of a default gateway?physically connects a computer to a networkprovides a permanent address to a computeridentifies the network to which a computer is connectedidentifies the logical address of a networked computer and uniquely identifies it to the rest of the networkidentifies the device that allows local network computers to communicate with devices on other networks2 What type of routing uses information that is manually entered into the routing table?dynamicinteriorstaticstandard4 Which IP packet field will prevent endless loops?type-of-serviceidentificationflagstime-to-liveheader checksum6 What is a component of a routing table entry?the MAC address of the interface of the routerthe destination Layer 4 port numberthe destination host addressthe next-hop address7 In an IPv4 environment, what information is used by the router to forward data packets from one interface of a router to another?destination network addresssource network addresssource MAC addresswell known port destination address8 What information is added during encapsulation at OSI Layer 3?source and destination MACsource and destination application protocolsource and destination port numbersource and destination IP address9 If the default gateway is configured incorrectly on the host, what is the impact on communications?The host is unable to communicate on the local network.The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.There is no impact on communications.10 In a connectionless system, which of the following is correct?The destination is contacted before a packet is sent.The destination is not contacted before a packet is sent.The destination sends an acknowledgement to the source that indicates the packet was received.The destination sends an acknowledgement to the source that requests the next packet to be sent.11 Which portion of the network layer address does a router use to forward packets? host portionbroadcast addressnetwork portiongateway address13 When the destination network is not listed in the routing table of a Cisco router, what are two possible actions that the router might take? (Choose two.)The router sends an ARP request to determine the required next hop address.The router discards the packet.The router forwards the packet toward the next hop indicated in the ARP table.The router forwards the packet to the interface indicated by the source address.The router forwards the packet out the interface indicated by the default route entry.14 What are three common problems with a large network? (Choose three.)too few broadcastsperformance degradationsecurity issueslimited management responsibilityhost identificationprotocol compatibility15 Which three statements are true about routes and their use? (Choose three.)If no route to the destination network is found, the packet is returned to the previous router.If the destination network is directly connected, the router forwards the packet to the destination host.If multiple network entries exist for the destination network, the most general route is used to forward the packet.If no route exists for the destination network and a default route is present, the packet is forwarded to the next-hop router.If the originating host has a default gateway configured, the packet for a remote network can be forwarded using that route.If a host does not have a route manually configured for the destination network, the host will drop the packet.16 Which intermediary devices could be used to implement security between networks? (Choose two.)routerhubswitchfirewallaccess pointbridge19 What are the key factors to consider when grouping hosts into a common network? (Choose three.)gatewayspurposephysical addressingsoftware versiongeographic locationownership20 What two characteristics are commonly associated with dynamic routing protocols? (Choose two.)require no device configurationprovide routers with up-to-date routing tablesrequire less processing power than static routes requireconsume bandwidth to exchange route informationprevent manual configuration and maintenance of the routing table21. What statement describes the purpose of a default route?A host uses a default route to transfer data to another host on the same network segment.A host uses a default route to forward data to the local switch as the next hop to all destinations.A host uses a default route to identify the Layer 2 address of an end device on the local network.A host uses a default route to transfer data to a host outside the local network when no other route to the destination exists.C62 Which IPv4 subnetted addresses represent valid host addresses? (Choose three.) 172.16.4.127 /26172.16.4.155 /26172.16.4.193 /26172.16.4.95 /27172.16.4.159 /27172.16.4.207 /273 Which statements are true regarding IP addressing? (Choose two.)NAT translates public addresses to private addresses destined for the Internet.Only one company is allowed to use a specific private network address space.Private addresses are blocked from public Internet by router.Network 172.32.0.0 is part of the private address space.IP address 127.0.0.1 can be used for a host to direct traffic to itself.4 Which process do routers use to determine the subnet network address based upon a given IP address and subnet mask?binary addinghexadecimal andingbinary divisionbinary multiplicationbinary ANDing5 What is the network address of the host 172.25.67.99 /23 in binary?10101100. 00011001.01000011.0000000010101100. 00011001.01000011.1111111110101100. 00011001.01000010.0000000010101100. 00011001.01000010.0110001110101100. 00010001.01000011. 0110001010101100. 00011001.00000000.000000006 What subnet mask would a network administrator assign to a network address of 172.30.1.0 if it were possible to have up to 254 hosts?255.255.0.0255.255.255.0255.255.254.0255.255.248.07 Which three IP addresses are private? (Choose three.)172.168.33.110.35.66.70192.168.99.5172.18.88.90192.33.55.89172.35.16.58 Given the IP address and subnet mask of 172.16.134.64 255.255.255.224, which of the following would describe this address?This is a useable host address.This is a broadcast address.This is a network address.This is not a valid address.11 Which of the following network devices are recommended to be assigned static IP addresses? (Choose three.)LAN workstationsserversnetwork printersroutersremote workstationslaptops12 Which of the following are features of IPv6? (Choose three.)larger address spacefaster routing protocolsdata types and classes of serviceauthentication and encryptionimproved host naming conventionssame addressing scheme as IPv413 A router interface has been assigned an IP address of 172.16.192.166 with a mask of 255.255.255.248. To which subnet does the IP address belong?172.16.0.0172.16.192.0172.16.192.128172.16.192.160172.16.192.168172.16.192.17614 What two things will happen if a router receives an ICMP packet which has a TTL value of 1 and the destination host is several hops away? (Choose two.)The router will discard the packet.The router will decrement the TTL value and forward the packet to the next router on the path to the destination host.The router will send a time exceeded message to the source host.The router will increment the TTL value and forward the packet to the next router on the path to the destination host.The router will send an ICMP Redirect Message to the source host.16 How many bits make up an IPv4 address?12864483217 What is the primary reason for development of IPv6?securityheader format simplificationexpanded addressing capabilitiesaddressing simplification18 What three facts are true about the network portion of an IPv4 address? (Choose three.)identifies an individual deviceis identical for all hosts in a broadcast domainis altered as packet is forwardedvaries in lengthis used to forward packetsuses flat addressing19 What is a group of hosts called that have identical bit patterns in the high order bits of their addresses?an interneta networkan octeta radixC71 What is a function of the data link layer?。
思科CCNA学习试题答案
思科CCNA学习试题答案CCNA课程测试一、单项选择题：1、介质100BaeT的最大传输距离是：()A:10mB:100mC:1000mD:500m2、路由器下，由一般用户模式进入特权用户模式的命令是：（）A：enableB:configC:interfaceD:router3、哪个命令可以成功测试网络：()A：Router>ping192.5.5.0B：Router#ping192.5.5.30C：Router>ping192.5.5.256D：Router#ping192.5.5.2554、介质工作在OSI 的哪一层（）A：物理层B：数据链路层C：网络层D：传输层5、100baeT的速率是()Mbit/A:1B:10C:100D:10006、在启用IGRP协议时，所需要的参数是：()A:网络掩码B:子网号C:自治系统号D:跳数7、基本IP访问权限表的表号范围是：()A:1—100B:1-99C:100-199D:800-8998、查看路由表的命令是：()A:howinterfaceB:howrunC:howiprouteD:howtable9、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10、OSI第二层数据封装完成后的名称是：()A:比特B:包C:帧D:段11、为了禁止网络210.93.105.0ftp到网络223.8.151.0，允许其他信息传输，则能实现该功能的选项是：()A：acce-lit1deny210.93.105.0.0.0.0.0.0B：acce-lit100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpC：acce-lit100permitipanyanyD：acce-lit100denytcp210.93.105.00.0.0.255223.8.151.00.0.0.255eqftpacce-lit100permitipanyany12、路由器下“特权用户模式”的标识符是：()A:>B:!C:#D:(config-if)#13、把指定端口添加到VLAN的命令是：() A:vlanB:vlan-memberhipC:vtpD:witchport14、交换机工作在OSI七层模型的哪一层()A:物理层B:数据链路层C:网络层D:传输层15、在OSI七层模型中，介质工作在哪一层()A:传输层B:会话层C:物理层D:应用层16、交换机转发数据到目的地依靠()A:路由表B:MAC地址表C:访问权限表D:静态列表17、为了使配置私有IP的设备能够访问互联网，应采用的技术是()？A:NATB:VLANC:ACCESS-LISTD:DDR18、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19、路由器的配置文件tartup-config存放在()里A:RAMB:ROMC:FLASHD:NVRAM20、配置路由器特权用户“加密密码”的命令是：()A:pawordB:enablepawordC:enableecretD:pawd21、某网络中，拟设计10子网，每个子网中放有14台设备，用IP地址段为199.41.10.某，请问符合此种规划的子网掩码是()A:255.255.255.0B:255.255.240.0C:255.255.255.240D:255.248.0.022、在路由表中到达同一网络的路由有：静态路由、RIP路由、IGRP路由，OSPF路由，则路由器会选用哪条路由传输数据：()A:静态路由B:RIP路由C:IGRP路由D:OSPF路由23、扩展IP访问权限表的表号范围是：()A:1—100B:1-99C:100-199D:800-89924、把访问权限表应用到路由器端口的命令是：()A:permitacce-lit101outB:ipacce-group101outC:applyacce-lit101outD:acce-cla101out25、混合型协议既具有“距离矢量路由协议”的特性，又具有“链路状态路由协议”的特性，下列协议中属于混合型协议的是：()A：RIPB：OSPFC：EIGRPD：IGRP26、在路由器上，命令howacce-lit的功能是（）：A:显示访问控制列表内容B:显示路由表内容C:显示端口配置信息D:显示活动配置文件27、RIP路由协议认为“网络不可到达”的跳数是：()A:8B:16C:24D:10028、查看E0端口配置信息的命令是：()A:howacce-litB:howiprouteC:howverionD:howinterfacee029、配置路由器时，封装PPP协议的命令是：()A:encappppB:pppC:grouppppD:intppp30、路由器上“水平分割”的功能是：()A:分离端口B：阻止路由环路C：简化配置D：方便故障处理31、OSI七层模型中，“包”是哪一层数据封装的名称（）A：物理层B：数据链路层C：网络层D：传输层32、OSI七层模型中，“段”是哪一层数据封装的名称（）A：物理层B：数据链路层C：网络层D：传输层33、备份路由器IOS的命令是：()A:copyflahtftpB:copyrunning-configtftpC:copyIOStftpD:copytartup-configtftp34、PPP工作在OSI的哪一层（）A：物理层B：数据链路层C：网络层D：传输层35、FTP工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层36、TELNET工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层37、SMTP工作在OSI哪一层（）A：会话层B：表示层C：传输层D：应用层38、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的子网号为（）A：192.168.50.32B：192.168.80.64C：192.168.50.96D：192.168.50.7139、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该IP地址所在子网的广播地址为（）A：192.168.50.32B：192.168.80.64C：192.168.50.96D：192.168.50.7140、IP地址为：192.168.50.70，掩码为：255.255.255.248，则该A：createB:interfaceC:encapulationD:ipaddre75、路由器上，命令“howint0”的显示结果为：Serial0iup,lineprotocolidown出现该结果的可能原因是（）A：端口处于关闭状态B：物理端口被烧毁C：两端设备协议不一致D：路由表中无路由76、如果把路由器的某个端口的IP配置为：192.168.10.64，掩码配置为：255.255.255.248，则该端口（）A：能和其他设备正常通信B：会变成“adminitrativelydown”状态C：端口被烧毁D：出现错误提示，配置命令执行失败77、网关的功能（）A：过滤数据包B：不同网段通信C：校验数据帧D：把数据封装成“段”78、能够分配给设备的IP，应该是（）A：网络有效IPB：网络号C：网络广播地址D：任意IP79、路由器“全局模式”的提示符为（）A:>B:#C:(config)#D:(config-router)#80、路由器当前的模式为“端口模式”，要退回到“特权模式”，应该使用的快捷键为（）A：ctrl+bB:ctrl+zC:ctrl+cD:ctrl+p81、下列命令中，无法正确执行的是（）A：Router(config)#howrunB:Router#ping127.0.0.1C:Router(config)#hotn amecicoD:Router#reload82、路由器上，设置端口速率的命令是（）A：clockrateB:bandwidthC:etD:encap83、路由器上，清空路由表的命令是（）A：clearipB:deleteiprouteC:deleterouteD:cleariproute某84、路由表中，某条路由的“路由代码为D”，则表明该路由为（）A：直连路由B：静态路由C：IGRP路由D：EIGRP路由85、两台路由器直连到一起，应该使用的线缆为（）A：交叉线缆B：直通线缆C：反转线缆D：任意线缆86、通过路由器的“配置端口conole”对路由器进行配置，应该使用的线缆为（）A：交叉线缆B：直通线缆C：反转线缆D：任意线缆87、下面对Cico2621路由器和Cico2501路由器描述中，错误的是（）A：Cico2621路由器的可扩展性优于Cico2501路由器B：Cico2621是模块化路由器C：Cico2501上提供一个100Mbit/的快速以太网端口D：Cico2501是固定端口的路由器88、为了连接“帧中继”线路，网络中的路由器需要提供的端口类型为（）A：FatEthernetB:SerialC:BRID:Ethernet89、路由器“特权模式”的提示符是：（）A：>B：#C：(config)#D:(config-if)#90、下列关于路由器和交换机的描述中，错误的是（）A：路由器可以用来连接internet B：二层交换机可以用来实现“异地网络”互连C：路由器可以用来做路径选择D：交换机可以转发广播二、多项选择题：正确答案的个数在每题的题后括号中有说明91、在路由器上，可以使用的命令有：()[选3个]A：pingB：howinterfaceC：howiprouteD：ipconfigE：wincfg92、在配置帧中继子接口时，在物理接口上应该配置的内容是：()[选3个]A：配置IP地址B：封装帧中继协议C：指定子接口类型D：设定子接口E：配置密码93、请选出交换机处理帧的三种模式：()[选3个]A：直通模式B：存储转发模式C：侦测模式D：分段模式E：阻塞模式94、对于IP为199.41.27.0，子网掩码为255.255.255.240，则该IP地址和子网掩码相作用会得到一系列IP，从下列选项中选出属于“有效IP”的选项：()[选3个]A：199.141.27.33B：199.141.27.112C：199.141.27.119D：199.141.27.126E：199.141.27.175F：199.141.27.20895、属于私有IP 段的是()[选3个]A：10.0.0.0-10.255.255.255B：172.16.0.0-172.31.255.255C：202.110.100.0-202.110.100.255D：192.168.0.0-192.168.255.255E：126.0.0.0-126.255.255.25596、下列哪一设备工作时，要用到OSI的七个层（一层到七层）（）[选3个]A：PCB：网管机C：WEB服务器D：交换机E：路由器97、网络中经常使用DDN服务，请选出DDN的优点（）[选3个]A：传输质量高B：接入方式灵活C：偷占带宽D：使用虚电路E：专用线路98、网络中经常使用“帧中继”服务，请选出帧中继的优点（）[选3个]A：偷占带宽B：提供拥塞管理机制C：可以使用任意广域网协议D：灵活的接入方式99、默认情况下，IGRP衡量路径好坏时，考虑的因素为（）[选2个]A：带宽B：可靠性C：最大传输单元D：延时100、交换机的三大功能为（）[选3个]A：地址学习B：转发过滤C：消除回路D：发送数据包。
ccna1章节及期末试题答案
第一章：正确答案：2.4.5解析：由于不需要使用网络设备和专用服务器，对等网络易于创建，复杂性更低，且成本更少。
而且对等网络也没有集中管理。
这种网络安全性更低，不可扩展，而且那些同时充当客户端和服务器的设备可能性能更差正确答案：1解析：正确答案： 3.5解析：选择网络介质的条件包括：所选介质可以成功传送信号的距离、要安装所选介质的环境、必须传输的数据量和速度以及介质和安装的成本。
正确答案：3和4解析：终端设备上的应用程序可以生成数据，更改数据内容并且负责启动封装过程。
正确答案：1和4解析：终端设备会发出通过网络传输的数据。
中间设备会在链路发生故障时通过备用路径传输数据，并且会过滤数据传输以增强安全性。
网络介质提供网络消息的传输通道。
正确答案：4解析：外联网是公司外部的人或企业合作伙伴访问数据的网络区域。
内部网只描述通常仅供内部人员访问的网络区域。
当设备连接到有线网络时，有线LAN 会受BYOD（自带设备）影响。
使用大学无线LAN 的设备多为平板电脑和智能手机。
大学生主要使用无线WAN 来访问他们的手机运营商网络。
.正确答案：2解析：由于通过Internet 可以联系在线供应商，所以家庭用户通过Internet 进行网上购物。
内联网基本上是仅供内部使用的局域网。
外联网是外部合作伙伴访问组织内部特定资源的网络。
家庭用户并不一定使用LAN 来访问Internet。
例如，PC 可以通过调制解调器直接连接到ISP。
正确答案：1解析：内部网这个术语用于表示一个组织的私有局域网和广域网连接。
内部网的设计旨在仅允许该组织的成员、员工或其他获得授权的人员进行访问。
正确答案：2和4解析：电缆和DSL 均能实现高带宽、始终联网，并提供到主机计算机或LAN 的以太网连接。
10正确答案：2和3解析：移动电话连接需要使用移动电话网络。
卫星连接通常用于家庭或企业外部不便使用物理布线的位置。
11正确答案：2解析：当对网络资源的请求超出了可用容量时，网络就会变得拥堵。
思科CCNA考试答案(全)
CCNA思科考试答案（全）第 1 章考试1一家拥有10 名员工的小型公司使用单个LAN 在计算机之间共享信息。
哪种类型连接适合此公司？由当地电话服务提供商提供的拨号连接能够使公司方便且安全地连接员工的虚拟专用网络通过当地服务提供商建立的私有专用线路通过当地服务提供商提供的宽带服务（如DSL）答案：4解析：对于这种小型办公室，比较适合通过被称为数字用户线路(DSL) 的常见宽带服务实现Internet 连接，这种服务由当地的电话服务提供商提供。
由于员工人数很少，带宽的问题并不突出。
如果公司较大，在远程站点有分支机构，则专用线路会更加适合。
如果公司员工需要通过Internet 与公司联系，则采用虚拟专用网。
2哪种网络情况需要使用WAN？员工工作站需要获取动态分配的IP 地址。
员工在出差时需要通过VPN 连接到公司电子邮件服务器。
分支机构的员工需要与同一园区网络上的另一座建筑物内的公司总部共享文件。
员工需要访问托管在其建筑物内DMZ 中的公司Web 服务器上的网页。
答案：2解析：当出差的员工需要通过WAN 连接到公司电子邮件服务器时，VPN 将通过WAN 连接在员工笔记本电脑与公司网络之间创建一个安全隧道。
通过DHCP 获取动态IP 地址是LAN 通信的功能。
在企业园区的不同建筑物之间共享文件可通过LAN 基础设施来实现。
DMZ 是企业LAN 基础设施内一个受保护的网络。
3以下哪项描述了WAN 的特征？WAN 和LAN 在同一地理范围内运行，但有串行链路。
WAN 网络归运营商所有。
所有串行链路均被视为WAN 连接。
WAN 可提供到园区主干网的终端用户网络连接。
答案：2解析：WAN 可用于将企业LAN 互连到远程分支机构站点LAN 和远程工作人员站点。
WAN 归运营商所有。
虽然WAN 连接一般通过串行接口实现，但并不是所有串行链路均连接至WAN。
LAN（而非WAN）可在组织中提供终端用户网络连接。
4电路交换WAN 技术的两个常见类型是什么？（请选择两项。
思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案
思科认证考试（ＣＣＮＡ）考试模拟题集锦(1-71题)及答案19及答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header? a) 96b) 47c) a random number above 1024d) 69e) none of the above2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet interfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.33. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the above4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addresses5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routec) show ip arpd) show arpe) there is no way to display the ARP cache6. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an I P host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.e)There is no such process.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the above8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-IS9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ram10. [CxNx] Which of the following explains the correct definition of administrative distance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the highest administrative distance will take priority.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes place12. [RINx] How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252?a) 32b) 30c) 60d) 62e) 413. [RxNx] What commands will list all protocols that are currently being routed? (Choose all that apply.)a) show ip protocolb) show protocolc) show rund) show starte) All of the above14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.15. [xxNx] If the access-group command is configured on an interface and there is no access-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0 networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network only17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.Coding Key and InformationThe first character represents the category of question.A - ATMB - BridgingC - Cisco specificE - EthernetF - Frame relayH - HDLCI - FDDIN - ISDNO - OSI modelP - PPPR - RoutingS - SwitchingT - Token ringX - X.25x - Not applicableThe second character represents protocol.A - AppletalkB - Banyan VinesD - DecnetI - IPL - Dial on DemandN - NLSPO - OSPFX - IPXx - Not ApplicableThe third character represents the certification that the question will help you prepare for.N - CCNA Exam #640-407P - CCNPAdvanced Cisco Router Configuration (ACRC) Exam 640-403Cisco LAN Switch Configuration (CLSC) Exam #640-404Cisco Monitoring and Troubleshooting Dial-up Services Exam #640-405Cisco Internetworking Troubleshooting ( CIT) Exam #640-406D - CCDA & CCDPCisco Design Specialist Exam #9E0-004Cisco Internetwork Design#640-025We will reserve the fourth character for future use.As an example, when you come across a question coded "BXDx", it signifies a question that will help you gain the CCDA or CCDP certification.CCNA试题1-19答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header?a) 96b) 47c) a random number above 1024d) 69e) none of the aboveAnswerd) 69Here is a sampling of other port numbers and the application they are associated with. The first 8 of these protocols are automatically forwarded through the router by using the helper-address commandTrivial File Transfer (TFTP) (port 69)Domain Name System (port 53)IEN-116 Name Server (port 42)Time service (port 37)NetBIOS Name Server (port 137)NetBIOS Datagram Server (port 138)Boot Protocol (BootP) client and server datagrams (port 67)TACACS service (port 49)Simple Mail Transfer Protocol (25)File Transfer Protocol (21)Simple Network Management Protocol (161)2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet interfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.3Answerb) ARPASNAP is the default encapsulation for a token ring interface NOVELL-ETHER is the default encapsulation for a ipx interface.3. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the aboveAnswera) ip address 1.1.1.1 255.255.255.0If you are not in the configuration mode, the ip address can be set by using the setup mode.Configuring interface Ethernet0/0:Is this interface in use? [yes]:Configure IP on this interface? [yes]:IP address for this interface [10.10.10.1]: 10.10.10.1Number of bits in subnet field [16]: 16Class A network is 10.0.0.0, 16 subnet bits; mask is /24Take note when using the setup mode the mask is configured using the number of subnet bits.4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addressesAnswerc) show ip interfaced) show interfaceExamples of each of these commands are shown below: Router_A#sh int e0/0Ethernet0/0 is up, line protocol is upHardware is AmdP2, address is0010.7b15.bd41(bia 0010.7b15.bd41)Internet address is 10.10.10.1/24MTU 1500 bytes, BW 10000 Kbit,DLY 1000 usec,rely 255/255, load 1/255Encapsulation ARPA, loopback not set,keepalive set (10 sec)ARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:06,output hang neverLast clearing of "show interface"counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops;input queue 0/75,0 drops5 minute input rate 0 bits/sec,0 packets/sec5 minute output rate 0 bits/sec,0 packets/sec0 packets input, 0 bytes,0 no bufferReceived 0 broadcasts, 0 runts,0 giants,0 throttles, 0 input errors, 0 CRC,0 frame, 0 overrun, 0 ignored,0 abort0 input packets with dribblecondition detected127 packets output, 11802 bytes,0 underruns0 output errors, 0 collisions,2 interface resets0 babbles, 0 late collision,0 deferred0 lost carrier, 0 no carrier0 output buffer failures, 0 outputbuffers swapped outRouter_A#sh ip int e0/0Ethernet0/0 is up, line protocol is upInternet address is 10.10.10.1/24Broadcast address is 255.255.255.255Address determined bynon-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is enabledOutgoing access list is not setInbound access list is not setProxy ARP is enabledSecurity level is defaultSplit horizon is enabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the sameinterface is disabledIP multicast fast switching is enabledRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting isdisabledTCP/IP header compression is disabledProbe proxy name replies are disabledGateway Discovery is disabledPolicy routing is disabledNetwork address translation is disabled5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routec) show ip arpd) show arpe) there is no way to display the ARP cacheAnswerc) show ip arpExample:Router_A#sh ip arpProtocol Address Age(min) Hardware Address Type InterfaceInternet 1.1.1.2 - 0010.7b15.bd50 ARPA FastEthernet1/0Internet 10.10.10.1 - 0010.7b15.bd41 ARPA Ethernet0/06. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network a nd a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The dest ination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.e)There is no such process.Answera) Whe re an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.Choice C describes Address Resolution Protocol (ARP). A host never has to resolve it’s own MAC address. The MAC address is burned into the Network Interface card. When the host is booted the MAC address will be loaded into memory.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the aboveAnswera) Telnetb) FTPTFTP and SNMP use layer 4 UDP.8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-ISAnswerb) OSPFe) IS-ISA link state routing protocol advertises, to it’s neighbors, the state of the link when the state of the link changes.A distance vector routing protocol advertises its routing table periodically.9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ramAnswerc) clear arp-cacheIf you have changed an ip address or a NIC card on a host you might use this command to reset the cache.10. [CxNx] Which of the following explains the correct definition of administrative distance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the highest administrative distance will take priority.Answerd) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.Cisco uses administrative distances (AD) to measure the reliability of the routing protocol. The lower the (AD) the more reliable the protocol.Router_C#sh ip routeCodes: C - connected, S - static,I - IGRP, R - RIP,M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF,IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPFNSSA external type 2E1 - OSPF external type 1,E2 - OSPF external type 2,E - EGPi - IS-IS, L1 - IS-IS level-1,L2 - IS-IS level-2, * -candidate defaultU - per-user static route, o - ODRGateway of last resort is not set172.16.0.0/24 is subnetted, 2 subnetsC 172.16.1.0 is directly connected,Serial1C 172.16.2.0 is directly connected,Serial0I 10.0.0.0/8 [100/8576] via 172.16.1.1,00:00:09, Serial1[100/8576] via 172.16.2.1, 00:00:19,Serial0The 100 in bold is the administrativedistance for IGRP.A partial list of administrative distances is included below:Protocol ADEIGRP 90IGRP 100OSPF 110RIP 120BGP 180If a router hears a IP RIP and a IGRP update for the same network the router will discard the rip information. IP RIP uses hop count as it’s metric, while IGRP uses a composite metric including bandwidth and load, speed is the primary consideration.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes placeAnswerb) multiple stations listen for traffic and transmit at the same timeCollisions is a term that is used in an ethernet environment. Ethernet can be described as a listen then transmit scenario. First a station will listen for traffic if no traffic is sensed then a transmission will take place. If two stations transmit at the same time collisions will occur. The first station to detect the collision sends out a jamming signal to alert all stations a collision has occurred. At this point these stations set up a random interval timer when the timer expires re-transmission will occur.Token ring is a token passing process a station can transmit only when he has the token. There never can be multiple tokens on the ring. Early token release allows up to two data frames to be transmitted on a token ring LAN at the same time. Collisions do not occur on a token ring.Because of the point to point nature of serial links collisions do not occur.Beaconing is a term used in a token passing environment.12. [RINx] How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252?a) 32b) 30c) 60d) 62e) 4Answerd) 62The above mask is using 6 bits to describe subnets. The formula used to determine the number of subnets (not including the all 0’s or all 1’s subnet) is 2n - 2 were n is the number of subnet bits. This is the number to use when configuring a ip address with the setup dialog.13. [RxNx] What commands will list all protocols that are currently being routed? (Choose all that apply.)a) show ip protocolb) show protocolc) show rund) show starte) All of the aboveAnswerb) show protocolc) show runShow ip protocol will show just the ip routing protocols that are currently configured. Show start may or may not show the current routed protocols.Below is the output of show protocolRouter_B#show protocolGlobal values:Internet Protocol routing is enabledAppletalk routing is enabledBRI0 is administratively down, line protocol is downBRI0:1 is administratively down, line protocol is downBRI0:2 is administratively down, line protocol is downSerial0 is administratively down, line protocol is downSerial1 is administratively down, line protocol is downSerial2 is administratively down, line protocol is downSerial3 is administratively down, line protocol is downTokenRing0 is administratively down, line protocol is down14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.Answere) All of the above.Every access list has an implicit deny all at the end. What would the need be to create a access list with just deny statements. Access-list are processed from the top down therefore the order of each statement could be critical, for instance suppose you created an access list and the first line was a permit any and the next line was a deny. Since it’s top down processing a packet would be permitted to pass on the first line and the second line would never be executed. An extended list will give you a "match count" that will help in determining what the most efficient order should be.15. [xxNx] If the access-group command is configured on an interface and there is no access-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.d) The command will be executed and permit all traffic in and out.There are two steps to use an access list .1. Create the list2. Place the access list on a interfaceThe analogy I use in class is:Suppose you reside in a gated community. The community is not protected until you hire the guard and then place him at the gate. If you hire the guard and never place him at the gate all traffic will be permitted. When there is no access list on an interface it is implicit permit anyWhen an access list is placed on a interface it is implicit deny any16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0 networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network onlyAnswerc) telnet sessions will be denied if initiated from any address other than 172.16.0.0 networkThe secret to this question is the key word "established." Established means that the packet will be permitted unless it is the first part of the three way handshake. Recall that when we initiate a TCP connection we have no ACK. How can we acknowledge a sequence number from the other side when we have not established a session with him?17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.Answera) Standard lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.A standard list will only check the source address. It makes no difference where the packet is going. If you place a standard list close to the source you could very well be denying that traffic to go to other destinations. An extended list can be placed close to the source because we can permit or deny traffic based upon the source and destination address. This insures that only traffic we wish to have denied is denied.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.i) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.Answerd) The packet will "die" when it reaches the terminator.２０—３９及答案20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active: a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the Active monitor.22. [FxNx] BECN and FECN are:a) Used to provide keepalives in a Frame Relay environmentb) Used to provide error checking in a Frame Relay environmentc) Used to provide congestion information in a Frame Relay environmentd) Used to provide flow control parameters in a Frame Relay environmente) BECN and FECN are not used in a Frame Relay environment.23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Choose all that apply.)a) Allows the use of a more robust addressing scheme.b) Allows for a larger scalable networkc) Reduces convergence timed) Allows "supernetting"e) All of the above.24. [OxNx] Which of the following are reasons for the OSI model?a) Standardizes interfacesb) Allows modular engineeringc) Facilitates learning and teachingd) All of the above.25. [RxNx] Which of the following is NOT a ROUTING protocol:a) OSPFb) RIPc) IPXd) EIGRP26. [RxNx] Which statement is NOT true about link state protocols:a) Link state advertisements are sent to all routers in an area.b) Each router executes the SPF algorithm.c) Link state routers keep a topological database of the network.d) Link state routers include the originating router s routing table.e) Link state routers know of possible alternate paths to a particular network.27. [RxNx] Which of the following would NOT appear in a routing table?a) Next hop addressb) Interface Port referencesc) MAC addressd) Network addresse) Metrics28. [OxNx] Which statement is true of the Datalink OSI layer ?a) 802.3 is the MAC sub layer.b) No such thingc) MAC sublayer provides the connection to the network layer.d) MAC sublayer uses SAPS to access the network layer.e) SAP sublayer uses the MAC layer to access the LAN medium.29. [RINx] Given the IP address of 193.243.12.43 and a subnet mask of 255.255.255.128, what is the subnet address?a) 194.243.12.32b) 193.243.0.0c) 194.243.12.43d) 193.243.12.128e) None of the above.30. [CxNx] Cisco uses a naming convention to identify frame types. Which four of the following mappings are correct?Cisco_name = Common_namea) cisco_II = Ethernet_IIb) arpa = Ethernet_IIc) sap = Ethernet_802.3d) sap = Ethernet_802.2 LLCe) Novell Ether = Ethernet_802.2 LLCf) cisco_802 = Ethernet_802.2 LLCg) snap = Token Ring Snaph) snap = Ethernet_SNAP31. [RxNx] In order to communicate throughout an internetwork, which of the following are required. Choose Two.a) The use of a routable protocol such as NetBEUI or LATb) A hierarchical naming scheme server such as DNSc) A host file at each communicating deviced) A two part network addressing scheme such as Network/Hoste) The use of a routable protocol such as IP or IPXf) The use of a routable protocol such as TCP or IPX32. [CxNx] What is the default route on an IP network? Choose one.a) This is the route that will be chosen first by IP for delivery of a datagram.。
CCNA中文版本题库_1
1、请参见图示。
当收到下列帧将会怎么做？（选择三项。
）ACFA. Router1的将剥离的源MAC地址，并将其与MAC地址0000.0c36.6965取代。
B. Router1的将剥离的源IP地址，并将其与IP地址192.168.40.1取代。
C.router1将剥离的目的MAC地址，并将其与MAC地址代替0000.0c07.4320。
D.router1将剥离的目的IP地址，并将其与192.168.40.1的IP地址替换。
E. Router1的将转发数据包输出接口的FastEthernet0/1。
F.router1将转发数据包输出接口的FastEthernet0/2。
2、请参见图示。
哪三种说法正确描述了网络设备A？（选择三项。
）BDEA.使用255.255.255.128子网掩码时，在各接口不需要的IP地址。
B.使用255.255.255.128子网掩码时，在各接口确实需要一个唯一的IP地址IP子网。
C.为255.255.255.0的子网掩码时，必须是一个二层设备的电脑进行通信彼此。
D.为255.255.255.0的子网掩码时，必须是一个三层设备的电脑进行通信彼此。
E.使用255.255.254.0的子网掩码时，每个接口并不需要一个IP地址。
3、OSI中那一层负责决定一个进程的可用性并查看是否有可用的资源分给该进程？EA.传输B.网络D.会话E.应用4、以下哪项描述了WAN设备的角色？（选择三项。
）A.CSU/ DSU用于端接本地数字环路B.调制解调器端接本地数字环路C.一个CSU/ DSU终止模拟本地环路D.调制解调器终止模拟本地环路E.路由器通常被视为DTE设备F.路由器通常被视为DCE设备注：SU/DSU是用于连接终端和数字专线的设备，属于DCE设备modem用于数字信号和模拟信号的转换，属于DCE设备路由器一般是DTE设备5、请参见图示，主机A ping接口S0/0的router3，什么是该ping的TTL值？A. 253B. 252C. 255D. 2546、网络管理员可以通过建立一个FTP连接到远程服务器验证新安装的主机的配置。
思科认证考试(CCNA)考试模拟题集锦(1-71题)及答案培训资料
思科认证考试(C C N A)考试模拟题集锦(1-71题)及答案思科认证考试（ＣＣＮＡ）考试模拟题集锦(1-71题)及答案19及答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal, of the destination port field of the User Datagram Protocol (UDP) header? a) 96b) 47c) a random number above 1024d) 69e) none of the above2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet interfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.33. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the above4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addresses5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routec) show ip arpd) show arpe) there is no way to display the ARP cache6. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the above8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-IS9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ram10. [CxNx] Which of the following explains the correct definition of administrative distance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the highest administrative distance will take priority.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes place12. [RINx] How many subnets are possible with a Class C address and a subnet mask of255.255.255.252?a) 32b) 30c) 60d) 62e) 413. [RxNx] What commands will list all protocols that are currently being routed? (Choosea) show ip protocolb) show protocolc) show rund) show starte) All of the above14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.15. [xxNx] If the access-group command is configured on an interface and there is noaccess-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network only17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.e) The packet will be removed by the token monitor.Coding Key and InformationThe first character represents the category of question.A - ATMB - BridgingC - Cisco specificE - EthernetF - Frame relayH - HDLCI - FDDIN - ISDNO - OSI modelP - PPPR - RoutingS - SwitchingT - Token ringX - X.25x - Not applicableThe second character represents protocol.A - AppletalkB - Banyan VinesD - DecnetI - IPL - Dial on DemandN - NLSPO - OSPFX - IPXx - Not ApplicableThe third character represents the certification that the question will help you prepare for.N - CCNA Exam #640-407P - CCNPAdvanced Cisco Router Configuration (ACRC) Exam 640-403Cisco LAN Switch Configuration (CLSC) Exam #640-404Cisco Monitoring and Troubleshooting Dial-up Services Exam #640-405Cisco Internetworking Troubleshooting ( CIT) Exam #640-406D - CCDA & CCDPCisco Design Specialist Exam #9E0-004Cisco Internetwork Design#640-025We will reserve the fourth character for future use.As an example, when you come across a question coded "BXDx", it signifies a question that will help you gain the CCDA or CCDP certification.CCNA试题1-19答案1. [OxNx] During a TFTP transfer using Cisco Routers what is the numeric value, in decimal,a) 96b) 47c) a random number above 1024d) 69e) none of the aboveAnswerd) 69Here is a sampling of other port numbers and the application they are associated with. The first 8 of these protocols are automatically forwarded through the router by using thehelper-address commandTrivial File Transfer (TFTP) (port 69)Domain Name System (port 53)IEN-116 Name Server (port 42)Time service (port 37)NetBIOS Name Server (port 137)NetBIOS Datagram Server (port 138)Boot Protocol (BootP) client and server datagrams (port 67)TACACS service (port 49)Simple Mail Transfer Protocol (25)File Transfer Protocol (21)Simple Network Management Protocol (161)2. [CxNx] What is the standard encapsulation method used by Cisco routers for the Internet Protocol (IP) on it’s Ethernet inte rfaces?a) SNAPb) ARPAc) NOVELL-ETHERd) DARPAe) Ethernet_802.3Answerb) ARPASNAP is the default encapsulation for a token ring interface NOVELL-ETHER is the default encapsulation for a ipx interface.3. [CxNx] What will be the correct command on a Cisco router to set the IP address of an interface assuming you are at the "router(config-if)#" prompt?a) ip address 1.1.1.1 255.255.255.0b) ip address 1.1.1.1c) ip 1.1.1.1d) ip 1.1.1.1 255.255.255.0e) none of the aboveAnswera) ip address 1.1.1.1 255.255.255.0If you are not in the configuration mode, the ip address can be set by using the setup mode. Configuring interface Ethernet0/0:Is this interface in use? [yes]:IP address for this interface [10.10.10.1]: 10.10.10.1Number of bits in subnet field [16]: 16Class A network is 10.0.0.0, 16 subnet bits; mask is /24Take note when using the setup mode the mask is configured using the number of subnet bits.4. [CxNx] Which commands will display the IP addresses of all interfaces on a Cisco Router? (Choose all that apply)a) show ip routeb) show ip addressc) show ip interfaced) show interfacee) display ip addressesAnswerc) show ip interfaced) show interfaceExamples of each of these commands are shown below:Router_A#sh int e0/0Ethernet0/0 is up, line protocol is upHardware is AmdP2, address is0010.7b15.bd41(bia 0010.7b15.bd41)Internet address is 10.10.10.1/24MTU 1500 bytes, BW 10000 Kbit,DLY 1000 usec,rely 255/255, load 1/255Encapsulation ARPA, loopback not set,keepalive set (10 sec)ARP type: ARPA, ARP Timeout 04:00:00Last input never, output 00:00:06,output hang neverLast clearing of "show interface"counters neverQueueing strategy: fifoOutput queue 0/40, 0 drops;input queue 0/75,0 drops5 minute input rate 0 bits/sec,0 packets/sec5 minute output rate 0 bits/sec,0 packets/sec0 packets input, 0 bytes,0 no bufferReceived 0 broadcasts, 0 runts,0 giants,0 throttles, 0 input errors, 0 CRC,0 frame, 0 overrun, 0 ignored,0 input packets with dribblecondition detected127 packets output, 11802 bytes,0 underruns0 output errors, 0 collisions,2 interface resets0 babbles, 0 late collision,0 deferred0 lost carrier, 0 no carrier0 output buffer failures, 0 outputbuffers swapped outRouter_A#sh ip int e0/0Ethernet0/0 is up, line protocol is upInternet address is 10.10.10.1/24Broadcast address is 255.255.255.255Address determined bynon-volatile memoryMTU is 1500 bytesHelper address is not setDirected broadcast forwarding is enabledOutgoing access list is not setInbound access list is not setProxy ARP is enabledSecurity level is defaultSplit horizon is enabledICMP redirects are always sentICMP unreachables are always sentICMP mask replies are never sentIP fast switching is enabledIP fast switching on the sameinterface is disabledIP multicast fast switching is enabledRouter Discovery is disabledIP output packet accounting is disabledIP access violation accounting isdisabledTCP/IP header compression is disabledProbe proxy name replies are disabledGateway Discovery is disabledPolicy routing is disabledNetwork address translation is disabled5. [CxNx] Which of the following commands will display the contents of the ARP cache of your Cisco router?a) show ip arp cacheb) show ip routed) show arpe) there is no way to display the ARP cacheAnswerc) show ip arpExample:Router_A#sh ip arpProtocol Address Age(min) Hardware Address Type InterfaceInternet 1.1.1.2 - 0010.7b15.bd50 ARPA FastEthernet1/0Internet 10.10.10.1 - 0010.7b15.bd41 ARPA Ethernet0/06. [CxNx] Reverse Address Resolution Protocol (RARP) is the process:a) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.b) Where an IP host resolves it’s MAC address by broadcasting to the local network it’s IP address.c) Where an IP host tries to resolve the MAC address of a destination by sending a network broadcast. The destination responds to the broadcast with it’s MAC address.d) Where an IP host resolves a destination IP address by sending a broadcast on the local network and the destination host responds with it’s IP address.e)There is no such process.Answera) Where an IP host resolves it’s IP address by broadcasting it’s MAC address to the network and a BOOTP server assigns it an IP address.Choice C describes Address Resolution Protocol (ARP). A host never has to resolve it’s o wn MAC address. The MAC address is burned into the Network Interface card. When the host is booted the MAC address will be loaded into memory.7. [OxNx] Which of the following applications requires the connection-oriented layer four protocol, TCP? (Choose all that apply)a) Telnetb) FTPc) TFTPd) SNMPe) none of the aboveAnswera) Telnetb) FTPTFTP and SNMP use layer 4 UDP.8. [RxNx] Which of the following are link state Routing Protocols.(Choose all that apply.)a) IPb) OSPFc) RIPd) EIGRPe) IS-ISb) OSPFe) IS-ISA link state routing protocol advertises, to it’s neighbors, the state of the link whenthe state of the link changes.A distance vector routing protocol advertises its routing table periodically.9. [CxNx] Of the following commands, identify the correct one for clearing the IP arp table in memory of the router.a) clear ip arp-cacheb) clear ip arp-tablec) clear arp-cached) clear arp-tablee) clear arp-ramAnswerc) clear arp-cacheIf you have changed an ip address or a NIC card on a host you might use this command toreset the cache.10. [CxNx] Which of the following explains the correct definition of administrativedistance as it pertains to Cisco’s IOS?a) The process by which routers select an administrator for an autonomous system.b) The process where a router will select the best path to a destination network.c) The process where a router will distance itself from other routers due to it’s lack of administrative experience.d) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.e) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with thehighest administrative distance will take priority.Answerd) The process where a router will prioritize routing protocols so that in the event two routing protocols have conflicting next hop addresses, the routing protocol with the lowest administrative distance will take priority.Cisco uses administrative distances (AD) to measure the reliability of the routing protocol. The lower the (AD) the more reliable the protocol.Router_C#sh ip routeCodes: C - connected, S - static,I - IGRP, R - RIP,M - mobile, B - BGPD - EIGRP, EX - EIGRP external, O - OSPF,IA - OSPF inter areaN1 - OSPF NSSA external type 1, N2 - OSPFNSSA external type 2E1 - OSPF external type 1,E2 - OSPF external type 2,i - IS-IS, L1 - IS-IS level-1,L2 - IS-IS level-2, * -candidate defaultU - per-user static route, o - ODRGateway of last resort is not set172.16.0.0/24 is subnetted, 2 subnetsC 172.16.1.0 is directly connected,Serial1C 172.16.2.0 is directly connected,Serial0I 10.0.0.0/8 [100/8576] via 172.16.1.1,00:00:09, Serial1[100/8576] via 172.16.2.1, 00:00:19,Serial0The 100 in bold is the administrativedistance for IGRP.A partial list of administrative distances is included below:Protocol ADEIGRP 90IGRP 100OSPF 110RIP 120BGP 180If a router hears a IP RIP and a IGRP update for the same network the router will discard the rip information. IP RIP uses h op count as it’s metric, while IGRP uses a composite metric including bandwidth and load, speed is the primary consideration.11. [ExNx] Collisions occur whena) multiple packets are placed on a serial linkb) multiple stations listen for traffic and transmit at the same timec) when multiple tokens are on a ring simultaneouslyd) beaconing process takes placeAnswerb) multiple stations listen for traffic and transmit at the same timeCollisions is a term that is used in an ethernet environment. Ethernet can be described as a listen then transmit scenario. First a station will listen for traffic if no traffic is sensed then a transmission will take place. If two stations transmit at the same time collisions will occur. The first station to detect the collision sends out a jamming signal to alert all stations a collision has occurred. At this point these stations set up a random interval timer when the timer expires re-transmission will occur.Token ring is a token passing process a station can transmit only when he has the token. There never can be multiple tokens on the ring. Early token release allows up to two data frames to be transmitted on a token ring LAN at the same time. Collisions do not occur on a token ring.Because of the point to point nature of serial links collisions do not occur.Beaconing is a term used in a token passing environment.12. [RINx] How many subnets are possible with a Class C address and a subnet mask of 255.255.255.252?a) 32b) 30c) 60d) 62e) 4Answerd) 62The above mask is using 6 bits to describe subnets. The formula used to determine the number of subnets (not including the all 0’s or all 1’s subnet) is 2n - 2 were n is the number of subnet bits. This is the number to use when configuring a ip address with the setup dialog.13. [RxNx] What commands will list all protocols that are currently being routed? (Choose all that apply.)a) show ip protocolb) show protocolc) show rund) show starte) All of the aboveAnswerb) show protocolc) show runShow ip protocol will show just the ip routing protocols that are currently configured. Show start may or may not show the current routed protocols.Below is the output of show protocolRouter_B#show protocolGlobal values:Internet Protocol routing is enabledAppletalk routing is enabledBRI0 is administratively down, line protocol is downBRI0:1 is administratively down, line protocol is downBRI0:2 is administratively down, line protocol is downSerial0 is administratively down, line protocol is downSerial1 is administratively down, line protocol is downSerial2 is administratively down, line protocol is downSerial3 is administratively down, line protocol is downTokenRing0 is administratively down, line protocol is down14. [xxNx] Which of the following are true of access lists?a) Access list should have at least one permit statement.b) The last configured line should always be a permit statement.c) Every access-list will implicitly deny all traffic.d) Access-lists are processed top down.e) All of the above.Answere) All of the above.Every access list has an implicit deny all at the end. What would the need be to create a access list with just deny statements. Access-list are processed from the top downtherefore the order of each statement could be critical, for instance suppose you createdan access list and the first line was a permit any and the next line was a deny. Sinceit’s top down processing a packet would be permitted to pass on the first line and the second line would never be executed. An extended list will give you a "match count" thatwill help in determining what the most efficient order should be.15. [xxNx] If the access-group command is configured on an interface and there is noaccess-list created which of the following is most correct?a) An error message will appear.b) The command will be executed and deny all traffic out.c) The command will be executed and permit all traffic out.d) The command will be executed and permit all traffic in and out.e) The command will be executed and deny all traffic in and out.Answerd) The command will be executed and permit all traffic in and out.There are two steps to use an access list .1. Create the list2. Place the access list on a interfaceThe analogy I use in class is:Suppose you reside in a gated community. The community is not protected until you hire the guard and then place him at the gate. If you hire the guard and never place him at the gateall traffic will be permitted.When there is no access list on an interface it is implicit permit anyWhen an access list is placed on a interface it is implicit deny any16. [xxNx] What is the result of the command?" access-list 101 permit tcp any 172.16.0.0 0.0.255.255 established"a) telnet sessions will be permitted regardless of the source addressb) telnet sessions will be denied regardless of the source addressc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkd) telnet sessions will be permitted to the 172.16.0.0 network onlye) telnet sessions will be denied to the 172.16.0.0 network onlyAnswerc) telnet sessions will be denied if initiated from any address other than 172.16.0.0networkThe secret to this question is the key word "established." Established means that thepacket will be permitted unless it is the first part of the three way handshake. Recallthat when we initiate a TCP connection we have no ACK. How can we acknowledge a sequence number from the other side when we have not established a session with him?17. [xxNx] Which is generally true of the location of access-lists? (Choose all that apply.)a) Standard lists will most likely be placed close to the destination.b) Standard lists will most likely be placed close to the source.c) Extended lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.e) It does not matter.Answera) Standard lists will most likely be placed close to the destination.d) Extended lists will most likely be placed close to the source.A standard list will only check the source address. It makes no difference where the packet is going. If you place a standard list close to the source you could very well be denying that traffic to go to other destinations. An extended list can be placed close to the source because we can permit or deny traffic based upon the source and destination address. This insures that only traffic we wish to have denied is denied.18. [RxNx] Which of the following is most correct?a) IP is to TCP. as IPX is to SPX.b) RTMP is to Appletalk as IP RIP is to IP.c) NLSP is to IPX as OSPF is to IP.d) a is true.e) b is true.f) a & b are true.g) c is true.h) b & c are true.i) a, b and c are true.Answeri) a, b and c are true.19. [ExNx] If Host A sends a packet to Host B over ethernet and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.Answerd) The packet will "die" when it reaches the terminator.２０—３９及答案20. [TxNx] If Host A sends a packet to Host B over token ring, and Host B is not active: a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the token monitor.21. [TxNx] If Host A sends a packet to Host B over token ring: Host A dies after transmitting, and Host B is not active:a) The packet will time out.b) The packet will be removed by Host A.c) The NVRAM of Host B will remove the packet.d) The packet will "die" when it reaches the terminator.e) The packet will be removed by the Active monitor.22. [FxNx] BECN and FECN are:a) Used to provide keepalives in a Frame Relay environmentb) Used to provide error checking in a Frame Relay environmentc) Used to provide congestion information in a Frame Relay environmentd) Used to provide flow control parameters in a Frame Relay environmente) BECN and FECN are not used in a Frame Relay environment.23. [RxNx] Which of the following are benefits of a Link-State routing protocol? (Chooseall that apply.)a) Allows the use of a more robust addressing scheme.b) Allows for a larger scalable networkc) Reduces convergence timed) Allows "supernetting"e) All of the above.24. [OxNx] Which of the following are reasons for the OSI model?a) Standardizes interfacesb) Allows modular engineeringc) Facilitates learning and teachingd) All of the above.25. [RxNx] Which of the following is NOT a ROUTING protocol:a) OSPFb) RIPc) IPXd) EIGRPe) NLSP26. [RxNx] Which statement is NOT true about link state protocols:a) Link state advertisements are sent to all routers in an area.b) Each router executes the SPF algorithm.c) Link state routers keep a topological database of the network.d) Link state routers include the originating router s routing table.e) Link state routers know of possible alternate paths to a particular network.27. [RxNx] Which of the following would NOT appear in a routing table?a) Next hop addressb) Interface Port referencesc) MAC addressd) Network addresse) Metrics28. [OxNx] Which statement is true of the Datalink OSI layer ?a) 802.3 is the MAC sub layer.b) No such thingc) MAC sublayer provides the connection to the network layer.d) MAC sublayer uses SAPS to access the network layer.e) SAP sublayer uses the MAC layer to access the LAN medium.29. [RINx] Given the IP address of 193.243.12.43 and a subnet mask of 255.255.255.128, what is the subnet address?a) 194.243.12.32b) 193.243.0.0c) 194.243.12.43d) 193.243.12.128e) None of the above.30. [CxNx] Cisco uses a naming convention to identify frame types. Which four of the following mappings are correct?Cisco_name = Common_namea) cisco_II = Ethernet_IIb) arpa = Ethernet_IIc) sap = Ethernet_802.3d) sap = Ethernet_802.2 LLCe) Novell Ether = Ethernet_802.2 LLCf) cisco_802 = Ethernet_802.2 LLCg) snap = Token Ring Snaph) snap = Ethernet_SNAP31. [RxNx] In order to communicate throughout an internetwork, which of the following are required. Choose Two.a) The use of a routable protocol such as NetBEUI or LATb) A hierarchical naming scheme server such as DNSc) A host file at each communicating deviced) A two part network addressing scheme such as Network/Hoste) The use of a routable protocol such as IP or IPXf) The use of a routable protocol such as TCP or IPX32. [CxNx] What is the default route on an IP network? Choose one.a) This is the route that will be chosen first by IP for delivery of a datagram.b) The address of the nearest downstream neighbor in a Token ring network.c) At the router, it is the route used to direct frames for which the next hop has not been explicitly listed in the routing table.d) Any static route listing in a routing table.e) When all conditions are equal, the best route for delivery of IP datagrams.33. [CxNx] A caret symbol (^) inserted into a failed command indicates which of the following. Choose one.a) Numeric data is required for this command.b) The point in a command where you can simply press return to complete the syntax string.c) The point in a command where you have entered an incorrect command, keyword or argument.d) The point in a command where you must enter a required value.e) This is a normal indicator for any failed command.34. [RXNx] The metric used by IPX RIP is:a) hopsb) ticksc) costd) ticks and hopse) None of the above.35. [xINx] Which one of the following masks has the nickname of the "serial mask"?a) 255.255.255.192b) 255.255.255.224c) 255.255.255.240d) 255.255.255.248e) 255.255.255.252。
ccna考试题及答案
ccna考试题及答案1. 以下哪项是网络层的功能？A. 路由选择B. 错误检测C. 流量控制D. 封装数据包答案：A2. 在OSI模型中，哪一层负责在网络中传输数据？A. 应用层B. 传输层C. 会话层D. 网络层答案：D3. 以下哪个协议是用于在IP网络中发现网络设备的？A. ARPB. RARPC. ICMPD. OSPF答案：A4. 在TCP/IP模型中，哪一层与OSI模型的传输层相对应？A. 应用层B. 互联网层C. 网络接口层D. 传输层答案：D5. 以下哪个地址是一个有效的IPv4地址？A. 192.168.1.256B. 192.168.1.1C. 10.0.0.0D. 172.16.300.1答案：B6. 在配置路由器时，以下哪个命令用于进入全局配置模式？A. enableB. configure terminalC. privileged execD. user exec答案：B7. 以下哪个命令用于在Cisco设备上显示当前配置？A. show running-configB. show startup-configC. show configD. show current-config答案：A8. 在Cisco设备上，以下哪个命令用于保存当前的配置到启动配置文件？A. copy running-config startup-configB. copy startup-config running-configC. save running-configD. save startup-config答案：A9. 以下哪个命令用于在Cisco设备上查看所有接口的状态？A. show interfacesB. show ip interface briefC. show interface statusD. show running-config interface答案：B10. 在Cisco设备上，以下哪个命令用于关闭接口？A. shutdownB. no shutdownC. disableD. no enable答案：A11. 以下哪个命令用于在Cisco设备上启用接口？A. shutdownB. no shutdownC. disableD. no enable答案：B12. 在配置静态路由时，以下哪个命令用于指定下一跳地址？B. ip static-routeC. route ipD. static-route ip答案：A13. 以下哪个命令用于在Cisco设备上清除ARP表？A. clear arp-cacheB. clear arpC. clear arp tableD. clear ip arp答案：D14. 在配置动态路由协议时，以下哪个命令用于在接口上启用RIP？A. ip rip enableB. ip rip receiveD. network rip答案：C15. 以下哪个命令用于在Cisco设备上查看RIP路由表？A. show ip ripB. show ip route ripC. show ripD. show ip protocols答案：B16. 在配置EIGRP时，以下哪个命令用于指定自动汇总？A. metric weightsB. auto-summaryC. network auto-summaryD. no auto-summary答案：B17. 以下哪个命令用于在Cisco设备上查看EIGRP邻居？A. show ip eigrp neighborsB. show eigrp neighborsC. show ip eigrpD. show eigrp interfaces答案：A18. 在配置OSPF时，以下哪个命令用于指定路由器ID？A. router-idB. router ospfC. networkD. area答案：A19. 以下哪个命令用于在Cisco设备上查看OSPF路由表？A. show ip ospfB. show ip ospf databaseC. show ospfD. show ip route ospf答案：D20. 在配置VLAN时，以下哪个命令用于创建一个新的VLAN？A. vlan databaseB. configure terminalC. vlan [vlan-id]D. new-vlan答案：C21. 以下哪个命令用于将接口分配给VLAN？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：C22. 在配置交换机时，以下哪个命令用于将接口设置为Trunk 模式？A. switchport mode accessB. switchport mode trunkC. switchport access vlan [vlan-id]D. switchport trunk vlan [vlan-id]答案：B23. 以下哪个命令用于在Cisco设备上查看VLAN配置？A. show vlanB. show vlan briefC. show vlan detailD. show vlan all答案：B24. 在配置VTP时，以下哪个命令用于将交换机设置为VTP服务器模式？A. vtp mode serverB. vtp mode clientC. vtp mode transparentD. vtp mode off答案：A25. 以下哪个命令用于在Cisco设备上查看VTP状态？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A26. 在配置STP时，以下哪个命令用于设置根桥？A. spanning-tree root primaryB. spanning-tree root secondaryC. spanning-tree root primary [priority]D. spanning-tree root secondary [priority]答案：C27. 以下哪个命令用于在Cisco设备上查看STP状态？A. show spanning-treeB. show spanning-tree detailC. show spanning-tree summaryD. show spanning-tree interface答案：A28. 在配置VLAN Trunking Protocol (VTP) 时，以下哪个命令用于设置VTP域名？A. vtp domain [domain-name]B. vtp password [password]C. vtp mode [mode]D. vtp version [version]答案：A29. 以下哪个命令用于在Cisco设备上查看当前的VTP版本？A. show vtp statusB. show vtp statisticsC. show vtp passwordD. show vtp configuration答案：A30. 在配置端口安全时，以下哪个命令用于限制接口上可以学习到的最大MAC地址数量？A. switchport port-security maximum [mac-count]B. port-security maximum [mac-count]C. switchport port-security violation restrictD. port-security violation shutdown答案：A这些题目和答案仅供学习和参考之用，实际的CCNA考试内容和形式可能会有所不同。
CCNA考试题库中英文翻译版及答案
CCNA考试题库中英⽂翻译版及答案CCNA考试题库中英⽂翻译版及答案1[1]1、 What are two reasons that a network administrator would use access lists? (Choose two、)1、出于哪两种理由，⽹络管理员会使⽤访问列表?A、 to control vty access into a routerA、控制通过VTY访问路由器B、 to control broadcast traffic through a routerB、控制⼴播流量穿越路由器2、⼀个默认得帧中继WAN被分类为哪种物理⽹络类型?A、 point-to-pointA、点到点B、 broadcast multi-accessB、⼴播多路访问C、 nonbroadcast multi-accessC、⾮⼴播多路访问D、 nonbroadcast multipointD、⾮⼴播多点E、 broadcast point-to-multipointE、⼴播点到多点Answer: C3、 A single 802、11g access point has been configured and installed in the center of a squarA few wireless users are experiencing slow performance and drops while most users are oat peak efficiency、 What are three likely causes of this problem? (Choose three、)3、⼀个802、11接⼊点被部署在⼀个⽅形办公室得中央，当⼤多数⽤户在⼤流量传输数⼀些⽆线⽤户发现⽆线⽹络变得缓慢与出现丢包A、 mismatched TKIP encryptionB、 null SSIDC、 cordless phonesD、 mismatched SSIDE、 metalF、 antenna type or directionAnswer: CEF4、 Refer to the exhibit、 How many broadcast domains exist in the exhibited topology?根据下图，图中得拓扑中存在多少个⼴播域?A、 one A、1B、 two B、2C、 three C、3D、 four D、4E、 five E、5F、 six F、6Answer: C5、 Refer to the exhibit、 What two facts can be determined from the WLAN diagram? (Choose two、) 5、根据下图，WLAN diagram决定了哪两个事实A、 The area of overlap of the two cells represents a basic service set (BSS)、A、两个 cells得overlap得区域描述了⼀个basic service setB、 The network diagram represents an extended service set (ESS)、B、⽹络描述了⼀个extended service setC、 Access points in each cell must be configured to use channel 1、C、再每个CELL中得AP必须被配置成使⽤channel 1D、 The area of overlap must be less than 10% of the area to ensure connectivity、D、为了确保连通性,重叠区域必须⼩于10%E、 The two APs should be configured to operate on different channels、E、两个访问点应该被配置成⼯作在不同得频道Answer: BE6、 The command frame-relay map ip 10、121、16、8 102 broadcast was entered on the router、Which of the following statements is true concerning this command?6、路由器上输⼊命令frame-relay map ip 10、121、16、8 102 broadcast，以下选项正确得就是?A、 This command should be executed from the global configuration mode、A、该命令应该在全局配置模式下被执⾏B、 The IP address 10、121、16、8 is the local router port used to forward data、B、IP地址10、121、16、8就是本地路由器⽤来转发数据得接⼝C、 102 is the remote DLCI that will receive the information、C、102就是远端得DLCI它将接受信息。
CCNA中英文试题两套
这是我学习过程中遇见的ccna试题，中文一份，英文一份，很经典呀。
1 技术人员需要为某幢已经布设有线以太网络的大厦提供无线连接。
哪三个因素会影响需要的接入点数目？（选择三项。
）大厦的规模大厦中实体内墙的数目多个办公室中有微波炉无线网络中使用的加密方法Windows 和Appletalk 操作系统的同时使用AP 中短波或红外线的使用2 下列关于无线网桥的陈述，哪一项是正确的？通过无线链路连接两个网络连接无线局域网的固定设备允许无线客户端连接到有线网络增强无线信号的强度3 接入点默认使用哪一类身份验证？开放式PSKWEPEAP4请参见图示。
在Linksys 集成路由器的Wireless 菜单选项中，Network Mode 选项Mixed 是什么意思？路由器支持加密和身份验证。
路由器支持有线和无线两种连接。
路由器支持802.11b、802.11g 和802.11n 设备。
路由器支持通过红外和无线电射频连接。
5 接入点可以使用哪两种身份验证方法？（选择两项。
）WEPWPAEAPASCII预共享密钥6 哪项接入点功能允许网络管理员定义可以进入无线网络的数据类型？加密黑客攻击拦截通信过滤MAC 地址过滤身份验证7 下列关于服务集标识符(SSID) 的陈述中，哪两个是正确的？（选择两项。
）标识无线设备所属的WLAN是一个包含32 个字符的字符串，不区分大小写负责确定信号强度同一WLAN 中的所有无线设备必须具有相同的SSID用于加密通过无线网络发送的数据8请参见图示。
在Linksys 集成路由器的Wireless 菜单中，哪个配置选项可用于让附近的客户端知道接入点的存在。
Network ModeNetwork Name (SSID)Radio BandWide ChannelStandard ChannelSSID Broadcast9 下列哪个术语准确描述了为防止黑客读取截取到的数据而进行的无线数据编码？地址过滤身份验证广播加密密码短语编码10 两种WEP 密钥长度分别是多少？（选择两项。
CCNA第三学期中文答案第六章
请参见图示。
下列哪三种说法正确描的网络设计（选择三项。
）—某路由器有两个快速以太网接口，需要连接到本地网络中的四个 VLAN。
在不降低网络必要性能的情况下，如何最少的物理接口达到此要求-3请参见图示。
所有设备的配置如图所示ping 通 R1 的 F0/0 接口。
PC2 无法 ping 通 PC1。
此故障的原因可能是什么\请参见图示。
图于将路由器连接到中继的上行链路。
收到的数据包发自 IP 地址。
The packet destination a 由器会如何处理此数据包…传统路由与单臂路由器有何区别…当网络中使用 VLAN 间路由时，下列关于 ARP 的说法中哪项正确下列关于使用子接口进行 VLAN 间路由的说法中哪两项正确（选择两项。
）！…当将路由器接口配置为 VLAN 中继端口时，必须遵循哪三点要素（选择三项。
）/请参见图示。
下列关于子接口说法中哪两项正确（选择两项。
）￥请参见图示。
路由器 R1 的 Fa0/0端口与的 Fa0/1 端口相连。
在两台设备上输入图中所示的命令后，网络管理员发现VLAN 2 中的设备无法 中的设备。
此问题可能的原因是什么11请参见图示。
PC1 尝但未成功。
此故障的原因可能是什么￥请参见图示。
R1 在网络 /28 和网络 /28路由。
PC1 可以 ping 通 R1 的 F0/1 接口，但无法 ping 通 PC3。
此故障的原因是什么@网络中的设备连接到了一台配置了 VLAN 的 24 端口第 2 层交换机。
交换机端口 0/2 至 0/4 被分配给 VLAN 0/5 至 0/8 被分配给 VLAN 20，端口 0/9 至 0/12 被分配给 VLAN 30。
其它所有端口被分配给默认 VLAN。
下案可使所有 VLAN 相互通信，同时还使连接 VLAN 所需的端口数量最少\下列关于interface fa0/命令的说法中哪两项正确（选择两项。
）^15请参见图示。
从图中所示的输出得出哪两条结论（选择两项。
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思科认证CCNA认证试题与答案中文版
思科认证CCNA认证试题与答案中文版
思科认证的考试内容包括笔试和实验。
笔试在全球认证的考试中心进行，时间为两个小时。
实验考试只限于思科在全世界范围内指定的6个考点，分别位于美国、澳大利亚、比利时、日本、北京的新世纪饭店以及香港。
实验室考试分为2天，第一天要求学生利用实验室提供的设备建立网络。
第二天由考官故意破坏学员的网络，学员则要想办法查出故障并加以解决。
下面是店铺为大家搜集的相关试题，供大家参考练习。
21、一个B类网络，有5位掩码加入缺省掩码用来划分子网，每个子网最多( )台主机
(A) 510
(B) 512
(C) 1022
(D) 2046
答案：D
22、在路由器中，能用以下命令察看路由器的路由表( )
(A) arp -a
(B) traceroute
(C) route print
(D) display ip routing-table
答案：D
23、DHCP客户端是使用地址( )来申请一个新的IP地址的
(A) 0.0.0.0
(B) 10.0.0.1
(C) 127.0.0.1
(D) 255.255.255.255
答案：D
注释:255.255.255.255是全网广播,DHCP客户端发送全网广播来
查找DHCP服务器.
24、下面有关NAT叙述正确的是( )
(A) NAT是英文“地址转换”的缩写，又称地址翻译
(B) NAT用来实现私有地址与公用网络地址之间的转换
(C) 当内部网络的主机访问外部网络的时候，一定不需要NAT
(D) 地址转换的.提出为解决IP地址紧张的问题提供了一个有效途径
答案：ABD
25、以下属于正确的主机的IP地址的是( )
(A) 224.0.0.5
(B) 127.32.5.62
(C) 202.112.5.0
(D) 162.111.111.111
答案：D
注释:这个题目不是太严谨,应该加上子网掩码.
A:224.0.0.5是多播地址
B:127.0.0.0保留作为测试使用
C:网络地址
26、设置主接口由up转down后延迟30秒切换到备份接口，主接口由down转up后60秒钟切换回主接口的配置为( )
(A) standby timer 30 60
(B) standby timer 60 30
(C) standby timer enable-delay 60 disable-delay 30
(D) standby timer enable-delay 30 disable-delay 60
答案：D
27、在一个以太网中，30台pc通过Quidway R2501路由器s0口连接internet，Quidway R2501路由器配置如下：
[Quidway-Ethernet0]ip address 192.168.1.1 255.255.255.0 [Quidway-Ethernet0]quit
[Quidway]interface s0
[Quidway-Serial0]ip address 211.136.3.6 255.255.255.252
[Quidway-Serial0]link-protocol ppp
一台PC机默认网关为192.168.2.1,路由器会怎样处理发自这台PC 的数据包?
(A) 路由器会认为发自这一台PC的数据包不在同一网段，不转发数据包
(B) 路由器会自动修正这一台PC机的IP地址，转发数据包
(C) 路由器丢弃数据包，这时候需要重启路由器，路由器自动修正误配
(D) 路由器丢弃数据包，不做任何处理，需要重配PC网关为192.168.1.1
答案：D
注释:PC的默认网关要指向路由器的以太网口的IP地址.
28、ISDN B信道速率是()
(A) 16kbps
(B) 64kbps
(C) 144kbps
(D) 2048kbps
答案:B
参考知识点：综合数字业务网(ISDN)由数字电话和数据传输服务两部分组成，一般由电话局提供这种服务。
ISDN的基本速率接口(BRI)服务提供2个B信道和1个D信道(2B+D)。
BRI的B信道速率为64Kbps,用于传输用户数据。
D信道的速率为16Kbps，主要传输控制信号。
在北美和日本，ISDN的主速率接口(PRI)提供23个B信道和1个D信道，总速率可达1.544Mbps，其中D信道速率为64Kbps。
而在欧洲、澳大利亚等国家，ISDN的PRI提供30个B信道和1个64Kbps D信道，总速率可达2.048Mbps。
我国电话局所提供ISDN PRI为30B+D
29、异步串口可以设为( )
(A) 专线方式
(B) 拨号方式
(C) 语音方式
(D) PRI接入方式
答案：AB
参考知识点：华为3com认证教材第一册3-11页
30、在Quidway路由器上，应该使用什么命令来观察网络的路由表( )
(A) display ip route-path
(B) display ip routing-table
(C) display interface
(D) display running-config
(E) display ip rip
答案：B
【思科认证CCNA认证试题与答案中文版】。