ccna第二学期练习答案中文
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】。
ccna第二章练习答案.docx
yy1 ・ Refer to the exhibit・ Identify the devices labeled A, B, C, and D in the network physical documentation. 匚A=bridge, B=switch, C=router, D=hubK A=bridge, B=hub, C=router, D=switchC A=bridge, B=router, C=hub, D=switchc A=hub, B=bridge, C=router, D=switch2 The central hub has malfunctioned in the network. As a result, the entire network is down. Which type of physical network topology is implemented?匚busE starC ring匚mesh3. A switch has failed in the network. As a result, only one segment of the network is down. Which type of physical network topology is implemented?C busC ring匚starE extended star4. Which three features apply to LAN connections? (Choose three.)厂operate using serial in terfacesV make network connection using a hubV limited to operation over small geographic areas厂 provide part-time connectivity to remote servicesV typically operate under local administrative control厂provide lower bandwidth services compared to WANs5. What is one advantage of defining network communication by the seven layers of the OSI model? 【:It in creases the ban dwidth of a n etwork.E It makes networking easier to learn and understand・It eliminates many protocol restrictions.匚It increases the throughput of a network.c It reduces the need for testing network connectivity.6. What makes it easier for different networking vendors to design software and hardware that willin teroperate?E OSI modelc proprietary desig ns匚IP addressing schemec standard logical topologies匚standard physical topologies7. Which term describes the process of adding headers to data as it moves down OSI layers?匚division匚encoding匚separation匚segmentationE encapsulation8. What is the term used to describe the transport layer protocol data unit?匚bits c packetsE segments匚framesc data streams9. Which of the following are layers of the TCP/IP model? (Choose three.)▽ Applicati onr PhysicalV Internet0 Network Access厂Prese ntation10. Which of the following are data link layer encapsulation details? (Choose two.)0 A header and trailer are added・厂Data is con verted into packets ・V Packets are packaged into frames・厂Frames are divided into segments.厂Packets are changed into bits for Internet travel.11. Which layer of the OSI model provides network services to processes in electronic mail and file transfer programs?匚data link匚transport匚n etworkE application12. Which two features apply to WAN connections? (Choose two.)V operate using serial interfacesP make network connection using a hub厂limited to operation over small geographic areasI- typically operate under local administrative control▽provide lower bandwidth services compared to LANs13. Which of the following are ways that bandwidth is commonly measured? (Choose three.)厂GHzps▽kbpsV Mbps厂Nbps厂MHzpsV Gbps14. Refer to the following list. Choose the correct order of data encapsulation when a device sends information. segments bits packetsdata frames匚1 -3-5-4-2C 2- 1-3-5-4C 2-4-3-5-1匚4-3-1-2-5E 4-1 -3-5-2C 3-5-1-2-415. Which of the following are factors that determine throughput? (Choose two.)厂types of passwords used on servers厂type of Layer 3 protocol usedV n etwork topologywidth of the network cable0 number of users on the network16. Refer to the exhibit・ Which column shows the correct sequenee of OSI model layers?E D17. Which layer of the OSI model provides connectivity and path selection between two end systems where routing occurs?c physical layer匚data link layerE network layer匚transport layer18. Which best describes the function of the physical layer?E Defines the electrical and functional specifications for the link between end systems・匚Provides reliable transit of data across a physical link.匚Provides connectivity and path selection between two end systems・匚Concerned with physical addressing, network topology and media access.。
ccna2答案第十一章
第十一章CCNA 第二学期Exploration:路由协议和概念(2010-12-24 10:14:15)转载▼标分类：2010｜ CCNA2官方试题--路签：由it1窗体顶端ERouting Chapter 11 - CCNA Exploration: 路由协议和概念(版本 4.0)为形成邻接关系，OSPF 路由器之间的哪三项参数必须相等？（选择三项。
）区域idK-values度量值hello 间隔网络类型接口类型窗体底端2窗体顶端请参见图示。
图中RouterA 、RouterB 和 RouterC 的以太网接口上运行OSPF。
路由器 D 新加入网络。
置了如图所示的环回接口(Lo 0) 。
RouterD 加入网络后，OSPF DR/BDR将会发生什么情况？RouterB 将成为DR 而 RouterD 将成为BDR 。
RouterD 将成为BDR而RouterA仍然是DR 。
RouterD 将成为DR 而 RouterA 将成为BDR 。
在选举过程完成之前，RouterC 是 DR 。
RouterD 将成为DR 而 RouterB 仍然是BDR 。
在当前DR 或 BDR 失效之前， DR 或 BDR 不会发生变化。
窗体底端3窗体顶端请参见图示。
什么配置语句可以得到如图所示show ip protocols命令输出的结果？B(config)# int fa0/0B(config-if)# router-id 192.168.1.5B(config)# int lo0B(config-if)# ip address 192.168.1.5B(config)# router ospf 1B(config-router)# router-id 192.168.1.5B(config)# router ospf 1B(config-router)# ip address 192.168.1.5窗体底端4窗体顶端请参见图示。
CCNA第二学期路由协议和概念chapter3答案
下列哪两项正确描述了管理距离与度量的概念？（选择两项。
）管理距离是指特定路由的可信度。
路由器会首先添加具有较大管理距离的路由。
网络管理员无法更改管理距离的值。
具有到目的地的最小度量的路由即为最佳路径。
度量总是根据跳数确定。
度量会根据所采用的第 3 层协议（如 IP 或 IPX）而发生变化。
Option 1 and Option 4 are correct.请参见图示。
下列关于 R1 如何确定与 R2 之间最佳路径的陈述中，哪一项正确？R1 会将使用网络 A 的 RIP 路由加入路由表，因为 RIP 的管理距离比 EIGRP 大。
R1 会将使用网络 A 的 RIP 路由加入路由表，因为 RIP 的路径开销比 EIGRP 低。
R1 会将使用网络 B 的 EIGRP 路由加入路由表，因为 EIGRP 的管理距离比 RIP 小。
R1 会将使用网络 B 的 EIGRP 路由加入路由表，因为 EIGRP 的路径开销比 RIP 低。
R1 会将 EIGRP 路由和 RIP 路由加入路由表，并在它们之间实施负载均衡。
2 points for Option 3下列关于无类路由协议的陈述，哪两项是正确的？（选择两项。
）在路由更新中发送子网掩码信息将完整的路由表更新发送给所有邻居受 RIP 第 1 版支持允许在同一拓扑结构中同时使用 192.168.1.0/30 和192.168.1.16/28 子网减少组织中可用地址空间的大小Option 1 and Option 4 are correct.网络管理员可使用下列哪一条命令来确定路由器是否启用了负载均衡？show ip protocolsshow ip routeshow ip interface briefshow ip interface2 points for Option 2存在下列哪两个条件时，使用距离矢量路由协议会比较有效？（选择两项。
）网络需要特殊的分层式设计网络必须能快速收敛网络使用的是集中星型拓扑结构网络使用的是平面设计相距最远的路由器之间超过 15 跳Option 3 and Option 4 are correct.路由协议有何作用？用于构建和维护 ARP 表。
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2.一个默认的帧中继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的中央，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和出现丢包A. mismatched TKIP encryptionB. null SSIDC. cordless phonesD. mismatched SSIDE. metal file cabinetsF. antenna type or directionAnswer: CEF4. Refer to the exhibit. How many broadcast domains exist in the exhibited topology?根据下图，图中的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的overlap的区域描述了一个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中的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的频道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，以下选项正确的是?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是本地路由器用来转发数据的接口C. 102 is the remote DLCI that will receive the information.C.102是远端的DLCI它将接受信息。
CCNA第二学期答案
.请参见图示。
对于发往的数据包，R2 会采取什么操作？它会丢弃数据包。
2.请参见图示。
R1 会使用哪一总结地址来向R2 通告其网络？3.请参见图示。
尽管R2 已配置正确，但主机A 还是无法访问Internet。
可以在R1 上配置哪两条可让主机 A 访问Internet 的静态路由？（选择两项。
ip route Fa0/1ip route4.请参见图示。
网络管理员已按图示配置了R1，并且所有接口都运作正常。
但从R1 ping 时失败。
造成此问题的原因可能是什么？默认路由配置有误。
5.请参见图示。
所有接口都已编址，并且运行正常。
网络管理员在主机A 上运行了tracert 命令。
得到这种输出的原因可能是什么？（选择两项。
）R2 的路由表中缺少的条目。
R1 的路由表中缺少的条目。
6.请参见图示。
从主机A 到主机B 的ping 成功，但从主机A ping 在Internet 上正常运行的主机却失败了。
此问题的原因是什么？未在这两台路由器上配置路由协议。
7.网络管理员使用RIP 路由协议在一个自治系统内实施路由。
下列哪两项是该协议的特征？（选择两项。
使用贝尔曼-福特算法确定最佳路径。
定期将完整的路由表发送给所有连接的设备。
8.请参见图示。
两台路由器无法建立相邻关系。
此问题的原因可能是什么？这两台路由器上的hello 间隔和dead 间隔不同9.在两台路由器能够使用OSPF 形成邻居邻接关系之前必须完成哪两项任务？（选择两项。
）路由器必须在网络类型方面达成一致。
路由器必须使用相同的dead 时间间隔。
10.下列关于链路状态路由协议的陈述，哪两项是正确的？（选择两项。
）运行链路状态协议的路由器可以建立完整的网络拓扑使用最短路径优先算法。
11.请参见图示。
下列关于Router1 路由表的陈述，哪三项是正确的？（选择三项。
）EIGRP 路由的AD 已经手动更改为默认值以外的其它值。
Router1 正同时运行着EIGRP 和OSPF 路由过程尚未配置任何默认路由。
CCNA第二学期Final超强整合版下
1、最新CCNA第二学期Final(超强整合版)下What are two functions of a router? (Choose two.)It forwards data packets toward their destination.It forwards the packet to the destination if the TTL value is 0.It changes the destination IP address of data packets before forwarding them to an exit interface.It determines the best path based on the destination MAC address.It acts as an intersection between multiple IP networks.答案：AE2、Refer 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 not located in NVRAM.答案：C3、Which router component contains a scaled-down version of the IOS that can be used to reload a complete version of the IOS in the event that the IOS becomes damaged or corrupted?ROMFlashSDRAMNVRAM答案：A4、Refer 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 command?This 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.答案：C5、Refer to the exhibit. How many routes are ultimate routes?3457答案：C6、Refer 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.答案：C7、Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (Choose two.)10.0.0.0/864.100.0.0/16128.107.0.0/16172.16.40.0/24192.168.1.0/24192.168.2.0/24答案：AF8、Refer to the exhibit. The router receives a packet that is destined for 192.168.5.79. How will the routerhandle this packet?It will forward the packet via the FastEthernet0/0 interface.It will forward the packet via the Serial0/0/0 interface.It will forward the packet via the Serial0/0/1 interface.It will drop the packet.答案：C9、Refer 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.答案：C10、When presented with multiple valid routes to a destination, what criteria does a router use to determine which routes to add to the routing table?The router selects the routes with the best metric. All routes that have the same best metric areThe router first selects routes with the lowest administrative distance. The resulting routes are thenThe router selects the routes with the lowest administrative distance. All routes with the same lowestThe router installs all routes in the routing table but uses the route with the best metric most when答案：B11、A router has learned two equal cost paths to a remote network via the EIGRP and RIP protocols. Bothprotocols are using their default configurations. Which path to the remote network will be installed in therouting table?the path learned via EIGRPthe path learned via RIPthe path with the highest metric valueboth paths with load balancing答案：A12、Which 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.答案：AD13、Refer 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.答案：CDFRefer 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 bridge答案：AB15Refer to the exhibit. When a static IP address is being configured on the host, what address should be used for the default gateway?10.1.1.110.1.1.2172.16.1.1192.168.1.1答案：D16、Refer to the exhibit. A network administrator accesses router R1 from the console port to configure a newly connected interface. What passwords will the network administrator need to enter to make the connection and the necessary configuration changes?the Cisco123 password onlythe Cisco789 password onlythe Cisco001 password onlythe Cisco001 password and the Cisco789 passwordsthe Cisco001 password and the Cisco123 passwords答案：D17、When connecting two devices, which situation would normally require the use of a crossover cable?connecting a host to a switchconnecting a switch to a routerconnecting a switch to a switchconnecting a host to a router console port答案：C18、Refer to exhibit. A company network engineer enters the following commands in the routers:R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1When the engineer enters the show ip route command on R1, the routing table does not display the static route to the 10.1.1.0 network. All R1 and R2 interfaces are correctly addressed per the graphic. What is a logical next step that the engineer could take in order to make the static route display in the routing table in R1?Enter default routes in R1 and R2.Enable the R1 and R2 serial interfaces.Configure the static route to use an exit interface instead of a next-hop address.Enter the copy run start command to force the router to recognize the configuration.答案：B19、Refer to the exhibit. The show cdp neighbors command was run on one of the devices as shown. Based on this information, which two facts can be determined? (Choose two.)The command was run on the router.ABCD is a non- CISCO device.Layer 3 connectivity between two devices exists.ABCD supports routing capability.ABCD is connected to the Fa0/0 interface of the neighboring device.答案：AE20、Refer 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.答案：A21、The network administrator configures the router with the ip route 172.16.1.0 255.255.255.0 172.16.2.2 command. How will this route appear in the routing table?C 172.16.1.0 is directly connected, Serial0/0S 172.16.1.0 is directly connected, Serial0/0C 172.16.1.0 [1/0] via 172.16.2.2S 172.16.1.0 [1/0] via 172.16.2.2答案：D22、Refer to the exhibit. The command ip route 0.0.0.0 0.0.0.0 S0/0/0 is run on router R2. What are the two results of this command? (Choose two.)A static route will be updated in the routing table.The traffic from the Internet will be directed to R2.The traffic from the source network 172.16.0.0/22 will be blocked.The route will be specified as the default route for all networks not defined in the routing table.All the broadcasts will be forwarded via the S0/0/0 interface of R2.答案：AD23、Refer to the exhibit. Hosts on the 192.168.1.0 network cannot communicate with hosts on the 172.16.1.1 network. The network administrator has run the show ip route command on R1.What could be the cause of this problem?The FastEthernet interface on R1 is disabled.Autosummarization is enabled on R1.The serial interface S0/0/0 of R1 is administratively down.No static route or routing protocol is configured.答案：D24、A company i s using static routes that are configured with an administrative distance of “1” on all routers in the network. The network administrator decides to introduce a dynamic routing protocol to reduce the manual configurations for the static routes. Which option identifies the correct procedure for the dynamic routing to take place in the network?The static routes and the dynamic routes will have the traffic alternate between them.The static routes will be automatically removed once the dynamic routing is configured.The static routes will be automatically updated with the next hop IP address once the dynamicThe static routes must be manually removed from all routers in order for the dynamic routes to be答案：D25、Refer to the exhibit. An administrator is adding a new subnet of 50 hosts to R3. Which subnet address should be used for the new subnet that provides enough addresses while wasting a minimum of addresses?192.168.1.0/24192.168.1.48 /28192.168.1.32/27192.168.1.64/26答案：D26、Refer to the exhibit. What summarization should R2 use to advertise its LAN networks to R1?172.16.0.0/24172.16.4.0/22172.16.4.0/23172.16.4.0/24答案：B27、Refer 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.答案：C28、Refer to the exhibit. Which host has a combination of IP address and subnet mask on the same network as Fa0/0 of Router1?host Ahost Bhost Chost D答案：B29、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 should the administrator use to create the new subnets?255.255.224.0255.255.240.0255.255.248.0255.255.252.0答案：C30、How will a router that is configured with a classless routing protocol determine the subnet mask that should be assigned to routes that are learned from neighboring classless routers?The subnet mask that is included in the routing updates will be used.The subnet mask of the interface that receives the update will be used.The subnet mask that is specified in the network command will be used.The class of the network in the update will determine the subnet mask that is used.答案：A31、Refer to the exhibit. When troubleshooting a network, it is important to interpret the output of various router commands. On the basis of the exhibit, which three statements are true? (Choose three.)The missing information for Blank 1 is the command show ip route.The missing information for Blank 1 is the command debug ip route.The missing information for Blank 2 is the number 100.The missing information for Blank 2 is the number 120.The missing information for Blank 3 is the letter R.The missing information for Blank 3 is the letter C答案：ADF32、Which statement correctly describes a feature of RIP?RIP is a link-state routing protocol.RIP uses only one metric—hop count— for path selection.Advertised routes with hop counts greater than 10 are unreachable.Messages are broadcast every 10 seconds.答案：B33、Refer to the exhibit. The network is using the RIPv2 routing protocol. If network 10.0.0.0 goes down, what mechanism will prevent Router1 from advertising false routing information back to Router2?triggered updatespoison reverseholddown timerssplit horizon答案：D34、Refer to the exhibit. While trying to diagnose a routing problem in the network, the network administrator runs the debug ip rip command. What can be determined from the output of this command?The router is broadcasting RIP updates.The router will be unable to ping 192.168.1.2.The router is directly connected to network 172.16.1.0 /24.The router has two interfaces that participate in the RIP process.答案：D35、Refer 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 configured to include all 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.答案：C36、Refer to the exhibit. When the show cdp neighbors command is issued from router C, which devices will be displayed in the output?B, DA, B, DD, SWH-2SWH-1, A, BSWH-1, SWH-2A, B, D, SWH-1, SWH-2答案：A37、Refer to the exhibit. The routers in the exhibit are running the EIGRP routing protocol. What statement is true regarding how packets will travel from the 172.16.1.0/16 network to the 192.168.200.0/24 network?The router chooses the first path that it learned and installs only that route in the routing table.The router chooses the path with the lowest administrative distance and installs only that route in the routing table.The router chooses the highest routing ID based on the advertised network IP addresses and installs only that route in the routing table.The router installs all the equal cost paths in the routing table but sends packets out only one, holding the others in reserve in case the primary route goes down.The router installs all the equal cost paths in the routing table and performs equal cost loadbalancing to send packets out multiple exit interfaces.答案：E38、Which three statements describe the operation of routing with EIGRP? (Choose three.)As new neighbors are discovered, entries are placed in a neighbor table.If the feasible successor has a higher advertised cost than the current successor route, then it becomes the primary route.If hello packets are not received within the hold time, DUAL must recalculate the topology.The reported distance is the distance to a destination as advertised by a neighbor.EIGRP maintains full knowledge of the network topology in the topology table and exchanges full routing information with neighboring routers in every update.EIGRP builds one routing table that contains routes for all configured routed protocols.答案：ACD39、Which statement correctly describes a feasible successor in EIGRP?It is a primary route that is stored in the routing table.It is a backup route that is stored in the routing table.It is a primary route that is stored in the topology table.It is a backup route that is stored in the topology table.答案：D40、Refer to the exhibit. Routers R1 and R2 are directly connected via their serial interfaces and are both running the EIGRP routing protocol. R1 and R2 can ping the directly connected serial interface of their neighbor, but they cannot form an EIGRP neighbor adjacency.What action should be taken to solve this problem?Enable the serial interfaces of both routers.Configure EIGRP to send periodic updates.Configure the same hello interval between the routers.Configure both routers with the same EIGRP process ID.答案：D41、Refer 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 R2S0/0/1 interface.答案：D42、Refer to the exhibit. Which two statements are true based on the exhibited output? (Choose two.)All routes are stable.Each route has one feasible successor.The serial interface between the two routers is down.The administrative distance of EIGRP has been set to 50.The show ip eigrp topology command has been run on R1.答案：AE43、Refer to the exhibit. R2 is configured correctly. The network administrator has configured R1 as shown. Which two facts are true about the forwarding of route information by R1? (Choose two.)R1 will forward the route information for subnet 192.168.100.0/30.R1 will not forward route information for subnet 192.168.100.4/30.R1 will forward the route information with an administrative distance set to 50.R1 will forward the summarized route information for network 192.168.100.0/24.R1 will forward route information for subnet 10.10.10.0/30 out the serial interface.答案：AB44、Refer to the exhibit. A network administrator is trying to determine why router JAX has no OSPF routes in its routing table. All routers are configured for OSPF area 0. From the JAX router, the administrator is able to ping its connected interfaces and the Fa0/1 interface of the ORL router but no other router interfaces. What is a logical step that the network administrator should take to troubleshoot the problem?Reboot the routers.Change the OSPF process ID on all of the routers to 0.Check to see if the cable is loose between ORL and JAX.Check to see if CDP packets are passing between the routers.Use show and debug commands to determine if hellos are propagating.答案：E45、Refer 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 configure a single area 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 1答案：A46、Refer 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?FastEthernet0/0FastEthernet0/1Serial0/0/0Serial0/0/1答案：C47、What is the function of the OSPF LSU packet?used to confirm receipt of certain types of OSPF packetsused to establish and maintain adjacency with other OSPF routersused to request more information about any entry in the BDRused to announce new OSPF information and to reply to certain types of requests答案：D48、Two 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 address答案：BC49、Refer to the exhibit. OSPF is used for the routing protocol and all interfaces are configured with the correct IP addresses and subnet masks. During testing, it is found that router R1 is unable to form an adjacency with R2. What is the cause of this problem?Both routers have been configured with incorrect router IDs.Both routers have been configured in different OSPF areas.Both routers have been configured with an incorrect network type.Both routers have been configured with different hello and dead intervals.答案：D50、Refer to the exhibit. The IP addresses on all interfaces on router R1 were configured before the OSPF protocol had been enabled on the router. No OSPF router ID was manually configured. Which IP address will be selected by the router as an OSPF router ID?10.10.10.1172.16.1.1172.16.2.1192.168.1.1192.168.100.1答案：AExam Viewer - ERouting Final Exam - CCNA Exploration: Routing Protocols and Concepts (Version 4.0)Below you will find the assessment items as presented on the exam as well as the scoring rules associated with the item.Use of the exam information in the Exam Viewer is subject to the terms of the Academy Connection Website Usage Agreement between you and Cisco. The purpose of the Exam Viewer is to support instruction while not compromising exam security for other Cisco Networking Academies or students.This material should not be distributed outside a proctored and controlled setting. If misuse is found,action will be taken to limit access to assessment content. Please remember to logout and close your browser window after using the Exam Viewer.1Using default settings, what is the next step in the router boot sequence after the IOS loads from flash?Perform the POST routine.Search for a backup IOS in ROM.Load the bootstrap program from ROM.Load the running-config file from RAM.Locate and load the startup-config file from NVRAM.Scoring Rule For: correctness ofresponseThis item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 1.1.4 Router Boot-up Process2 A router boots and enters setup mode. What is the reason for this?The IOS image is corrupt.Cisco IOS is missing from flash memory.The configuration file is missing from NVRAM.The POST process has detected hardware failure.Scoring Rule For: correctness ofresponseThis item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 1.1.4 Router Boot-up Process3Which two router component and operation pair are correctly described? (Choose two.)DRAM - loads the bootstrapRAM - stores the operating systemFlash - executes diagnostics at bootupNVRAM - stores the configuration fileROM - stores the backup configuration filePOST - runs diagnostics on hardware modulesScoring RuleFor: correctness of responseOption 4 andOption 6 arecorrect.1 point for eachcorrect option.0 points if moreoptions areselected thanrequired.Max Value = 2This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 1.1.2 Router CPU and Memory4Refer to exhibit. Given the topology shown in the exhibit, what three commands are needed to configure EIGRP on the Paris router? (Choose three.)Paris(config)# router eigrp 100Paris(config)# router eigrpParis(config-router)# network 192.168.6.0Paris(config-router)# network 192.168.7.0Paris(config-router)# network 192.168.8.0Paris(config-router)# network 192.168.9.0Scoring Rule For: correctness ofresponseOption 1, Option 4, and Option 5are correct.1 point for each correct option.0 points if more options areselected than required.Max Value = 3This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts•9.2.4 The network Command5Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that interface Fa is not functioning. Which action will most likely 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.Scoring Rule For: correctness ofresponse2 points for Option 40 points for any other optionThis item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 1.2.2 Basic Router Configuration6Which routing protocol maintains a topology table separate from the routing table?IGRPRIPv1RIPv2EIGRPScoring Rule For: correctness ofresponseThis item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts•9.1.1 EIGRP: An Enhanced Distance Vector Routing Protocol7Which statement is true about the metrics used by routing protocols?A metric is a value used by a partiA 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.Scoring Rule For: correctness ofresponse2 points for Option 10 points for any other optionMax Value = 2This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 3.3.1 Purpose of a Metric8Refer to the exhibit. All interfaces are addressed and functioning correctly. The network administrator runs the tracert comma Which two facts could be responsible for the output of this command? (Choose two.)The gateway for Host A is missing or improperly configured.The gateway for Host B is missing or improperly configured.The entry for 192.168.1.0/24 is missing from the routing table of R1.The entry for 192.168.1.0/24 is missing from the routing table of R2.The entry for 192.168.2.0/24 is missing from the routing table of R1.The entry for 192.168.2.0/24 is missing from the routing table of R2.Scoring Rule For: correctness ofresponseOption 4 and Option 5 are correct.1 point for each correct option.0 points if more options are selectedthan required.Max Value = 2This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 2.7.2 Troubleshooting a Missing Route9Refer to the exhibit. What information can be determined from the displayed output?EIGRP packets are waiting to be sThe 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.Scoring Rule For: correctness ofresponse2 points for Option 40 points for any other optionMax Value = 2This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts•9.5.1 The Null0 Summary Route10Which phase of the router boot process involves running diagnostics on the hardware components from ROM?performing the POSTloading the bootstrap programlocating and loading the Cisco IOS softwarelocating and loading the startup configuration fileScoring Rule For: correctness ofresponse2 points for Option 10 points for any other optioMax Value = 2This item references content from the following areas:CCNA Exploration: Routing Protocols and Concepts• 1.1.4 Router Boot-up Process11Refer 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. W result of adding this command?This 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.Scoring Rule For: correctness of。
CCNA_ESwitching _Chapter_2_答案
1请参见图示。
当主机 1 试图发送数据时会发生什么情况？来自主机 1 的帧会导致接口关闭。
会丢弃来自主机 1 的帧，且不发送日志消息。
来自主机 1 的帧会在运行配置中创建MAC 地址条目。
来自主机 1 的帧会删除地址表中的所有MAC 地址条目。
2启动配置存储在哪里？DRAMNVRAMROMstartup-config.text3下列关于执行模式口令的说法中哪两项正确？（选择两项。
）使能加密口令命令采用明文存储所配置的口令。
使能加密口令命令的安全性比使能口令高。
使能口令和使能加密口令用于保护对特权执行模式的访问。
需要采用命令service password-encryption来加密使能加密口令。
最佳做法是要求同时配置并使用使能口令和使能加密口令。
4请参见图示。
网络管理员尝试通过安全外壳连接到Switch1 但失败了。
最可能的原因是什么？配置的vty 线路不正确默认网关地址不正确安全外壳版本不兼容vty 线路被配置为只允许Telnet 连接5请参见图示。
图中显示网络中存在多少个冲突域？1246786请参见图示。
图中显示了show running-config命令的部分输出。
此交换机的使能口令是"cisco"。
从图中所示的输出可得默认情况下会加密使能口令。
所有加密口令均采用MD5 哈希算法加密。
在此配置中，已配置的所有线路模式口令都会被加密。
此行代表最安全的特权执行模式口令。
7请参见图示。
如果SW1 的MAC 地址表为空，SW1 会对从PC_A 发送到PC_C 的帧采取以下哪项操作？SW1 会丢弃该帧。
SW1 会将该帧从除端口Fa0/1 之外的所有端口泛洪出去。
SW1 会将该帧从该交换机上除端口Fa0/23 和Fa0/1 之外的所有端口泛洪出去。
SW1 会采用CDP 协议同步两台交换机的MAC 地址表，然后将帧转发到SW2 上的所有端口。
8可采用哪两种方法来使交换机不易受MAC 地址泛洪、CDP 攻击和Telnet 攻击等攻击的影响？（选择两项。
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ERouting Chapter 1 - CCNA Exploration: 路由协议和概念(版本4.0)1口令可用于限制对Cisco IOS 所有或部分内容的访问。
请选择可以用口令保护的模式和接口。
（选择三项。
）VTY 接口控制台接口特权执行模式2路由器从相连的以太网接口收到消息后，会更改哪项报头地址，再将消息从另一个接口发送出去？第 2 层源地址和目的地址3请参见图示。
网络管理员已经为路由器连接到直连网络的接口配置了如图所示的IP 地址。
从路由器ping 相连网或路由器接口之间相互ping 都会遭到失败。
此问题最可能的原因是什么？必须使用no shutdown命令启用接口。
4请参见图示。
主机A ping 主机B。
当以太网接口的ping 时，哪两块报头信息包括在内？（选择两项。
）目的IP 地址：192.168.10.134目的MAC 地址：9999.DADC.12345网络管理员刚把新配置输入Router1。
要将配置更改保存到NVRAM，应该执行哪一条命令？Router1# copy running-config startup-config6您需要配置图中所示的串行连接，必须在Sydney 以下哪条配置命令才能与Melbourne 站点建立连接？（选择三项）Sydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# clock rate 560007请参见图示。
从路由器的运行配置输出可得出什么结论？显示的命令决定了路由器的当前运行情况。
8请参见图示。
在主机2 连接到LAN 上的交换机后法与主机 1 通信。
导致此问题的原因是什么？主机 1 和主机2 位于不同的网络中。
9输入以下命令的作用是什么？R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# login设置通过Telnet 连接该路由器时使用的口令10以下哪一项正确描述了路由器启动时的顺序？加载bootstrap、加载IOS、应用配置11加载配置文件时的默认顺序是怎样的？NVRAM、TFTP、CONSOLE12请参见图示。
所有路由器的路由表中都所示每个网络的路由。
这些路由器上没有配置默认路由。
以下关于数据包在该网络中转发方式的结论中，哪两项是正确的？（如果RouterA 接收到发往192.168.3.146 的数据包，它将把该数据包从接口S0/0/1 转发出去。
如果RouterB 接收到发往10.5.27.15 的数据包，它将把该数据包从接口S0/0/1 转发出去。
13关于负载均衡特征的描述，哪两条是正确的？（选择两项。
）负载均衡可让路由器通过多条路径将数据包发送到同一的目的网络。
EIGRP 支持不等价负载均衡。
14请参见图示。
从图中的路由表输出结论？（选择两项。
）此路由器的FastEthernet0/0 接口和Serial0/0/0 接口配置了IP 地址和no shutdown命令。
路由器收到的目的地址为198.18.9.1 的IP 数据包后，将从Serial0/0/0 接口转发出去。
15如果路由器在启动时无法找到有效的配置文件，将发生什么情况？路由器将提示用户进行响应，以进入设置模式。
16图中的哪些接口用线路WAN 连接？（选择两项。
）1417下列哪些是路由器的功能？（选择三项。
）分组交换广播域分段根据逻辑编址选择最佳路径18哪两项说法正确描述了路由器的组件？（选择两项。
）ROM 含有硬件模块所执行的诊断程序。
重新启动时闪存中的内容不会丢失。
19在启动过程中，路由器可以从哪些位置加载Cisco IOS？（选择两项。
）TFTP 服务器闪存20网络管理员需要通过路由器的FastEthernet 端口直接连接两台路由器。
应使用哪种电缆？交叉电缆21当路由器收到从一个网络发往另一个网络的数据包时，它会执行哪三个过程？（选择三项。
）通过解开第 2 层帧报头来解封第 3 层数据包通过IP 报头中的目的IP 地址在路由表中查找下一跳地址将第 3 层数据包封装成新的第2 层帧，并将该帧从送出接口转发出去参加考试- ERouting Chapter 2 - CCNA Exploration: 路由协议和概念(版本 4.0)1当外发接口不可用时，路由表中的静态路由条目有何变化？该路由将从路由表中删除。
2哪两种设备负责将来自WAN 服务提供商的数据转换为路由器可以接受的形式？（选择两项。
）调制解调器CSU/DSU 设备3请参见图示。
要使WinterPark 和Altamo够传送来自每个LAN 的数据包并将所有其它流量转到Internet，应该使用哪一组命令来配置静态路由？WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.04路由器配置有到达每个目的网络的静态路由。
下列哪两种情况需要管理员变更该路由器上配置的静态路由？（选择两项。
）目的网络不再存在。
拓扑结构发生变化，导致现有的下一跳地址或送出接口无法访问。
5请参见图示。
在到达10.0.0.0 网/8 表示什么意思？它表示在数据包目的IP 地址中，从左开始有多少个连续比特位必须与10.0.0.0 匹配才能使用这条路由。
6网络管理员在Router1 中输入了以下命令：ip route 192.168.0.0 255.255.255.0 S0/1/0。
Router1 随后收到发往192.168.据包。
在路由表中找到最近刚配置的静态路由之后，Router1 接下来将如何处理该数据包？将该数据包封装到适合该WAN 链路的帧中，并将其从S0/1/0 接口转发出去7Router# show interfaces serial 0/1命令的输出显示了如下内容：Serial0/1 is up, line protocol is down. 线路协议为的原因最可能是什么？尚未设置时钟频率。
8请参见图示。
公司的到任务，要在两个以太网之间建立连通性，使10.1.1.0/24 子网上的主机能与10.1.2.0/24 子网上的主机通信。
该工程师被告器只能使用静态路由。
使用下列哪一组命令可以在这两个以太网之间建立连接？R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.19两个独立子网上的主机之间无法通信。
网络管理员怀疑其中一个路由表中缺少路由。
可以使用哪三条命令来帮助排查第3 层连（选择三项。
）pingtracerouteshow ip route10指向下一跳IP 的静态路由在路由表中会显示怎样的管理距离和度量？管理距离为1，度量为011以下有关CDP 和图示的说法中，哪项是正确的？路由器 D 上运行的CDP 会收集有关路由器A、B、C 和E 的信息。
默认情况下，路由器 A 将从路由器 B 和 C 接收CDP 通告。
如果路由器 D 和 E 运行的路由协议不同，那么它们不会交换CDP 信息。
路由器 E 可以使用CDP 来识别路由器 B 上运行的IOS。
12图中的路由器使用如图所示的对Router3 而言，要将内部网络通告给网云，最有效的路由总结是什么？192.1.1.0/2513请参见图示。
为使主机到172.16.0.0 网络上的主机B，应在Router1 上配置哪种静态路由？ip route 172.16.0.0 255.255.0.0 S0/0/014Router# show cdp neighbors命令会显示下列哪些内容？（选择三项。
）平台保持时间本地接口15请参见图示。
根据如图所示的输出，钟频率会如何确定？DCE 上配置的频率决定了时钟频率。
16请参见图示。
要使192.168.1.0 和10.0.0.0 网络且无需递归查找，需要使用下列哪两条命令？（选择两项。
）A (config)# ip route 10.0.0.0 255.0.0.0 s 0/1/0B(config)# ip route 192.168.1.0 255.255.255.0 s 0/0/017请参见图示。
下列哪两条命令会将10.0.0.0/8 网络的下172.16.40.2 更改为192.168.1.2？（选择两项。
）A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.218哪两项说法描述了CDP 的功能或特点？（选择两项。
）它会自动启动，允许设备检测使用CDP 的直连邻居设备。
它允许系统彼此之间相互了解，而无论它们所配置的网络层协议是否相同。
19通过检查show ip interface brief命令的输出可得到什么信息？接口IP 地址20为什么在创建送出接口为以太网络的静态路由时输入下一跳IP 地址是明智之举？在多路访问网络中，如果没有下一跳地址，路由器将无法确定以太网帧的下一跳MAC 地址。
21请参见图示。
目的地为172.16.0.0 网会被如何转发？Router1 会执行递归查找，数据包将从S0/0 接口发出。
22哪一个地址可以用来总结从172.16.0.0/24 到172.16.7.0/24 的所有网络？172.16.0.0/21参加考试- ERouting Chapter 3 - CCNA Exploration: 路由协议和概念(版本 4.0)1下列哪两项正确描述了管理距离与度量的概念？（选择两项。
）管理距离是指特定路由的可信度。
具有到目的地的最小度量的路由即为最佳路径。
2请参见图示。
下列关于R1 如何确定与R2 之间最中，哪一项正确？R1 会将使用网络B 的EIGRP 路由加入路由表，因为EIGRP 的管理距离比RIP 小。
3下列关于无类路由协议的陈述，哪两项是正确的？（选择两项。
）在路由更新中发送子网掩码信息允许在同一拓扑结构中同时使用192.168.1.0/30 和192.168.1.16/28 子网4网络管理员可使用下列哪一条命令来确定路由器是否启用了负载均衡？show ip route5存在下列哪两个条件时，使用距离矢量路由协议会比较有效？（选择两项。