CCNA学习指南第2章复习题中英文翻译版

ccna学习指南CCNA是网络工程师的必要技能之一，CCNA也是认证级别之一，是Cisco公司颁发的网络工程技术认证证书。

拥有CCNA证书的网络工程师，可以在面对企业级网络设备时更轻松地识别、配置、维护这些设备，更好地解决网络故障和优化网络。

CCNA考试分为两部分，分别是实验考试（LAB）和单项选择题考试（Theory）。

在LAB考试中，考生需要在实际运用中展示自己掌握的技能；在Theory考试中，考生需要通过选择题等方式回答理论问题。

考试时间分别为8小时和2小时。

以下是CCNA学习指南：1. 建立正确的学习计划在学习CCNA之前，需要建立一个合理的学习计划。

首先，对CCNA的考试内容进行全面了解，分清楚各个知识点的重点和难点。

在这个基础上，建立详细的学习计划，包括学习周期、每天学习的时间和任务安排等，并在实践中不断地进行调整和改进。

2. 掌握知识点CCNA考试范围越来越广泛，知识点也越来越多。

但最基本的知识点不可缺少。

因此，在准备考试之前，需要系统地学习网络基础和TCP/IP协议，了解网络设备的选购和安装维护等方面。

同时，还要深入了解各种协议的规范和功能以及常见的网络设备的配置方法和维护技巧。

3. 进行实验练习CCNA考试注重实践能力的考察，所以实验练习是不可避免的。

在学习知识点的过程中，需要进行实验验证，理解实验现象和结果，并总结出规律和技巧。

当然，在进行实验操作时需要注意安全，不要进行危险的操作，以免造成网络故障。

4. 深度掌握路由协议路由协议是CCNA考试的重点，所以需要深度掌握。

包括静态路由、动态路由、OSPF、RIP、BGP 等各种协议的配置和维护，尤其需要注意路由协议的UDP端口号和网络拓扑的设计和优化。

5. 阅读相关资料CCNA的考试内容非常多，考生需要具备广泛的网络知识。

因此，在学习的过程中，需要不断地阅读相关的资料，包括网络的书籍、网络的博客、网络论坛的文章等等。

通过阅读这些资料，可以更全面、更深入地了解网络的知识点，也可以了解其他人的学习经验和技巧。

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】。

诶了我累了目录第二章网络通信P2-8第三章应用层功能及协议P9-14第四章OSI传输层P15-20第五章OSI网络层P21-27第六章网络编址-IPv4 P28-34第七章数据链路层P35-40第八章OSI物理层P41-45第九章以太网P46-51第十章网络规划和布线P52-61第十一章配置和测试网络P62-70第一学期末考试P71-91文档末尾返回目录第二章网络通信001 TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表示、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包002下列哪些陈述正确指出了中间设备在网络中的作用？（选择三项）确定数据传输路径发起数据通信重新定时和重新传输数据信号发送数据流管理数据流数据流最后的终止点003下列哪三项陈述是对局域网 (LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。

此类网络由由一个组织管理。

LAN 中的不同网段之间一般通过租用连接的方式连接。

此类网络的安全和访问控制由服务提供商控制。

LAN 为同一个组织内的用户提供网络服务和应用程序访问。

此类网络的每个终端通常都连接到电信服务提供商 (TSP)。

004 什么是 PDU？传输期间的帧损坏在目的设备上重组的数据因通信丢失而重新传输的数据包特定层的封装005 OSI 模型哪两层的功能与 TCP/IP 模型的网络接入层相同？（选择两项）网络层传输层物理层数据链路层会话层006请参见图示。

所示网络属于哪一类型？WANMANLANWLAN007 以下哪种特征正确代表了网络中的终端设备？管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径008 第 4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识通过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务009 请参见图示。

1 Which of the following are primary functions of a router? (Choose two.)packet switchingmicrosegmentationdomain name resolutionpath selectionflow control2Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through a router? (Choose three.)The router modifies the TTL field, decrementing it by one.The router changes the source IP to the IP of the exit interface.The router maintains the same source and destination IP.The router changes the source physical address to the physical address of the exit interface.The router changes the destination IP to the IP of the exit interface.The router sends the packet out all other interfaces, besides the one it entered the router on.3Refer to the exhibit. Which path will traffic from the 172.16.1.0/24 network take to get to the 10.0.0.0/24 network?ADCABCIt will load balance the traffic between ADC and ABCIt will send the traffic via ABC, and will use ADC as a backup path only when ABC fails.4Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is true regarding how the routers in this topology event?Router4 will learn about the failed route 30 seconds later in the next periodic update.Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expires.Router5 immediately flushes the unreachable route from its routing table.Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0.5Refer to the exhibit. Which three statements are true of the routing table for Router1? (Choose three.)The route to network 172.16.0.0 has an AD of 156160.Network 192.168.0.16 can best be reached using FastEthernet0/0.The AD of EIGRP routes has been manually changed to a value other than the default value.Router1 is running both the EIGRP and OSPF routing process.Network 172.17.0.0 can only be reached using a default route.No default route has been configured.6If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from where will the router try to load the IOS imageROMRAMNVRAMflashTFTP server7Two routers need to be configured within a single OSPF area. Which two components need to be configured on both routers to achieve this? (Choose two.)the same process IDthe same area IDnetwork addresses and wildcard masksthe same router IDthe same loop back address8Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured?the IP address of the Fa0/0 interface at R1the IP address of the S0/0/1 interface at R2the IP address of the S0/0/0 interface at R1the subnet mask of the S0/0/1 interface at R29Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2?192.168.1.0/24192.168.0.0/24192.168.0.0/22192.168.1.0/2210Refer to the exhibit. Host A is unable to access the Internet. What is the reason for this?The IP address of host A is incorrect.The default gateway of host A is incorrect.The Fa0/1 interfaces of the two routers are configured for different subnets.The subnet mask for the Fa0/0 interface of R1 is incorrect.11Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two devices can be used for this? (Choose two.)a CSU/DSU devicea modeman Ethernet switcha huba bridge12Refer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load the start-up configuration settings.What could be the cause of this problem?There is insufficient NVRAM.There is insufficient flash memory.The configuration register is not configured with the default setting.The system image file is not located in NVRAM.13Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database command. However, upon running the sh command, the network administrator sees that the router has installed a different route to the 192.168.6.0 network learned via EIGRP. What could be the reason for th route?Compared to RIP, EIGRP has a lower administrative distance.Compared to EIGRP, RIP has a higher metric value for the route.Compared to RIP, the EIGRP route has fewer hops.Compared to RIP, EIGRP has a faster update timer.14Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the network. Which set of commands is required to confi OSPF for the networks that are connected to R2?R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config)# router ospf 2R2(config-router)# network 10.1.1.0 0.0.0.3 area 0R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.1.1.0 0.0.0.3 area 1R2(config)# router ospf 1R2(config-router)# network 192.168.2.0 0.0.0.255 area 0R2(config-router)# network 10.0.0.0 0.0.0.3 area 115Refer to the exhibit. What information can be determined from the displayed output?EIGRP packets are waiting to be sent to the neighbors.The adjacencies between the routers are yet to be established.The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2.Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 interface.16Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two routers are unable to establish a neighbor adjacency. W network administrator do to troubleshoot this problem?Check if the interfaces of the routers are enabled.Check the hello and dead intervals between the routers.Check the process ID of both routers.Check if CDP is enabled on all the routers.17Refer to the exhibit. A network administrator has configured OSPF using the following command:network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF?FastEthernet0/0FastEthernet0/1Serial0/0/0Serial0/0/118Which two statements are true for link-state routing protocols? (Choose two.)Routers that run a link-state protocol can establish a complete topology of the network.Routers in a multipoint network that run a link-state protocol can exchange routing tables.Routers use only hop count for routing decisions.The shortest path first algorithm is used.Split horizon is used to avoid routing loops.19Refer to the exhibit. A network administrator adds this command to router R1: ip route 192.168.2.0 255.255.255.0 S0/0/0. What is the result of adding this commandThis route is automatically propagated throughout the network.The traffic for network 172.16.1.0 is forwarded to network 192.168.2.0.A static route is established.The traffic for all Class C networks is forwarded to 172.16.1.2.20Refer to the exhibit. What is the meaning of the highlighted value 120?It is the metric that is calculated by the routing protocol.It is the value that is used by the DUAL algorithm to determine the bandwidth for the link.It is the administrative distance of the routing protocol.It is the hold-down time, measured in seconds, before the next update.21Which statement is true about the RIPv1 protocol?It is a link-state routing protocol.It excludes subnet information from the routing updates.It uses the DUAL algorithm to insert backup routes into the topology table.It uses classless routing as the default method on the router.22Which two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.)authenticationlink-state advertisementshold-down timersSpanning Tree Protocolsplit horizon23Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem?An incorrect IP address is configured between the two routers.No static route is configured on Router2.A routing loop has occurred.No routing protocol is configured on either of the two routers.24Which mechanism helps to avoid routing loops by advertising a metric of infinity?route poisoningsplit horizonhold-down timertriggered updates25Which statement is true about the metrics used by routing protocols?A metric is a value used by a particular routing protocol to compare paths to remote networks.A common metric is used by all routing protocols.The metric with the highest value is installed in the routing table.The router may use only one parameter at a time to calculate the metric.26Which two statements are true about the EIGRP successor route? (Choose two.)It is saved in the topology table for use if the primary route fails.It may be backed up by a feasible successor route.It is used by EIGRP to forward traffic to the destination.It is flagged as active in the routing table.After the discovery process has occurred, the successor route is stored in the neighbor table.27In which situation would a default static route be recommended?when connecting an edge router to the Internetwhen variable length subnet masking is in effectwhen there is more than one valid route for a destination networkwhen a destination network has a larger mask than any routes in the routing table28Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that interface FastEthernet0/1 is not functioning. Which ac correct the problem with FastEthernet0/1?A clock rate should be added to the interface configuration.The subnet mask should be added to the interface configuration.An interface description needs to be added to the interface configuration.The no shutdown command needs to be added to the interface configuration.29Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Router2 in order to put the interface in the same networ interface of Router1?IP 172.16.0.18, subnet mask 255.255.255.0IP 172.16.32.15, subnet mask 255.255.255.240IP 172.16.0.18, subnet mask 255.255.255.252IP 172.16.32.18, subnet mask 255.255.255.25230 A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configured on all routers. Both protocols appear in the oprotocols. However, only EIGRP internal routes appear in the routing tables. Which statement correctly explains the scenario?The OSPF protocol has a higher cost than EIGRP.The EIGRP protocol has a lower metric than OSPF.The EIGRP protocol was configured first on the router.The EIGRP protocol has a lower administrative distance than OSPF.31Which prompt is used to allow a user to change the IP address of an interface on a router?Router>Router#Router(config)#Router(config-if)#32Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly configured and operational. Both routers are configu connected interfaces in routing updates. R2 is not showing any routes from R1 in the routing table. What is the likely cause?The adjacent interfaces are passive.The distance of 120 exceeds 15 hops.R2 will not accept version 1 updates from R1.Routes are being summarized by R1 but not by R2.33 A network administrator is in charge of two separate networks that share a single building. What device will be required to connect the two networks and add a comthe Internet that can be shared?hubrouteraccess pointEthernet switch34 A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 2000 hosts for local LANs. Which subnet mask sadministrator use to create the new subnets?255.255.224.0255.255.240.0255.255.248.0255.255.252.035Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a static route entry be altered to accommodate aKeep the existing static route and configure a new static route with the correct next hop IP address.Negate the existing static route and configure a new static route with the correct next hop IP address.Do nothing. The existing static route will automatically update the next hop entry with the new IP address.Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP address.36Refer to the exhibit. What needs to be done to allow these two routers to connect successfully?Add a clock rate to S0/0/0 on R1.Add an interface description to S0/0/1 on R2.Change the serial interface on R2 to S0/0/0 so that it matches R1.Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1.37Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this router without entering a password?The login command was not entered on the console line.The enable password should be an enable secret password.No username and password combination has been configured.Console connections cannot be configured to require users to provide passwords.38Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration as router RTR_A. What should be done so that ho server A?Add the command no auto-summary on all routers.Change the network statements to include a wildcard mask.Adjust the EIGRP hello timers to account for the network delay.Add the command eigrp log-neighbor-changes on all routers.39Refer to the exhibit. The network administrator has run the following command on R1.R1(config)# ip route 192.168.2.0 255.255.255.0 172.16.1.2What is the result of running this command?Traffic for network 192.168.2.0 is forwarded to 172.16.1.2.This route is automatically propagated throughout the entire network.Traffic for all networks is forwarded to 172.16.1.2.The command invokes a dynamic routing protocol for 192.168.2.0.40What are two ways that a router can learn of the paths to destination networks? (Choose two.)updates from other routersDHCP information broadcastsmanual configuration of routesARP requests from connected routersinspection of the destination IP address in data packetsupdates from the SMTP management information base41Why is fast convergence desirable in networks that use dynamic routing protocols?Hosts are unable to access their gateway until the network is converged.Routers will not allow packets to be forwarded until the network is converged.Routers may make incorrect forwarding decisions until the network has converged.Routers will not allow configuration changes to be made until the network has converged.42A router learns about network 192.168.10.128/27 from multiple sources. Which option represents the best route and will be placed in the routing table?S 192.168.10.128/27 [1/0] via 192.168.10.226R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/043Which candidate route has the longest match for a packet with a destination address of 10.30.16.48?10.30.0.0/1610.30.15.0/2310.30.16.0/2410.30.16.32/2710.30.16.32/3044Which feature of RIPv2 enables it to function as a classless routing protocol?Subnet masks are included in routing updates.Routing updates are triggered by topology changes.Next-hop addresses are included in routing updates.Multicast addresses are used to send routing updates.45Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are displayed. All routers are operational and pings are network.Which ping will fail?from R1 to 172.16.1.1from R1 to 192.168.3.1from R2 to 192.168.1.1from R2 to 192.168.3.146 A technician configures the Fa0/0 interface on a router with ip address 192.168.3.5 255.255.255.252. What additional command must be issued by the technicianinterface to forward traffic?Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config47Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will be listed in the R2 routing table?48Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set of addressing values would allow a compute to the router interface to communicate with remote networks?A: 172.16.3.254 B: 255.255.192.0 C: 172.16.3.31A: 172.16.3.31 B: 255.255.192.0 C: 172.16.3.255A: 172.16.3.254 B: 255.255.255.0 C: 172.16.3.31A: 172.16.3.31 B: 255.255.255.0 C: 172.16.3.149Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)10.0.0.0/864.100.0.0/16128.107.0.0/16172.16.40.0/24192.168.1.0/24192.168.2.0/2450Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router prompt, what is the name of the router?nameciscorouterhostname。