ccna第二学期练习答案中文
CCNA2 思科第二学期 v2.0 ERouting Chapter 7答案
请参见图示。
如果所有路由器都运行RIP 第2 版，为什么没有192.168.1.32/27 网络的路由？Rip 第2 版不会在更新中发送子网掩码。
路由器A 并未将RIP 设置为路由协议。
Rip 第2 版默认将自动总结路由。
路由器B 未设置为通告192.168.1.64/30 网络。
2 points for Option 3请参见图示。
下列哪个路由器上的哪条命令可让Router1 获知192.168.0.0/20 网络？Router1(config)# ip classlessRouter1(config-router)# no passive-interface serial 0/1/1Router2(config-router)# version 2Router2(config-router)# neighbor 10.0.0.22 points for Option 3哪两项是选择实施RIP 第 2 版而不是RIP 第 1 版的原因？（选择两项。
）RIP 第2 版支持VLSM。
RIP 第2 版支持16 台以上的路由器。
RIP 第2 版支持有类（而不是无类）路由RIP 第2 版支持路由更新验证。
RIP 第2 版支持多区域。
RIP 第2 版使用Dijkstra 算法而不是贝尔曼-福特算法。
Option 1 and Option 4 are correct.RIP v1 和RIP v2 的相似点有哪些？（选择三项。
）两者都使用跳数作为度量。
两者对无穷距离使用相同的度量值。
两者都向邻居广播其更新。
两者都在更新中发送子网掩码信息。
两者都对更新来源进行身份验证。
两者都使用水平分割来防止路由环路。
Option 1, Option 2, and Option 6 are correct.请参见图示。
路由器East 和West 被配置为使用RIPv1。
两台路由器都会发送有关其直连路由的更新。
East 路由器可以ping 通West 路由器的串行接口，West 可以ping 通East 的串行接口。
ccna第二学期练习答案中文
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。
CCNA第二学期练习答案chapter9
1On a router running EIGRP, what database would maintain a list of feasible successors?routing tableneighbor tabletopology tableadjacency table2Refer to the exhibit. This is the debug output from 2 directly connected EIGRP routers. They forming an adjacency. What is the cause?one router is a non-cisco routerthey have different autonomous-system numbersthey are using difference sequence numbersthey are sending incorrect hello types3Refer to the exhibit. Which command will advertise the 192.168.1.64/30 network but not the 192.168.1.32 network on router A?network 192.168.1.0network 192.168.1.0 255.255.255.0network 192.168.1.64 0.0.0.3network 192.168.1.64 0.0.0.7network 192.168.1.64 0.0.0.2554 What two actions will the EIGRP DUAL FSM take if a link to a network goes down? (Chooseput the route into passive modequery neighbors for a new routesearch routing table for a feasible successorrun the SPF algorithm to find a new successorsearch topology table for a feasible successor5Refer to the exhibit. What is indicated by the P at the beginning of the topology entry?the route is in a stable statethe route is a preferred routeDUAL is searching for a better route to this destinationthe exit interface is in passive mode and EIGRP advertisements are blocked6 In which of the following tables does the EIGRP DUAL algorithm store the primary route to adestination? (Choose two.)routingtopologyneighborpathshortest path7 What information is maintained in the EIGRP topology database for a destination route? (Chthree.)the routing protocolthe feasible distance of the routethe highest cost of the routethe SRTT value for the routethe route cost as advertised by the neighboring routerthe physical address of the gateway interface8 Which of the following statements describes the bounded updates used by EIGRP?Bounded updates are sent to all routers within an autonomous system.Partial updates are sent only to routers that need the information.The updates are sent to all routers in the routing table.Updates are bounded by the routers in the topology table.9 Which of the following types of routes will be denoted by EX in EIGRP routing table entries?two.)routes learned from other routing protocolsroutes learned from any non-adjacent EIGRP routersany route with a hop count metric higher than 224EIGRP routes that originate in different autonomous systemsall passive routes in the routing table10Host 192.168.1.66 in the network illustrated is unable to ping host 192.168.1.130. How must configured to enable connectivity between the two hosts? (Choose two.)R1(config-router)# network 192.168.1.128R1(config-router)# auto-summaryR1(config-router)# no auto-summaryR2(config-router)# no auto-summaryR2(config-router)# auto-summaryR2(config-router)# network 192.168.1.6411 Which two statements describe characteristics of EIGRP? (Choose two.)EIGRP is a distance vector routing protocol.EIGRP supports classless routing and VLSM.EIGRP is classified as a link-state routing protocol.EIGRP uses TCP for reliable delivery of EIGRP update packets.With EIGRP, loop-free paths are achieved through the use of hold-down timers.EIGRP sends a periodic update every 30 minutes.12Refer to the exhibit. Based on the output of show ip eigrp neighbors, what are two possible with adjacencies between Router1 and Router2? (Choose two.)The routers are configured with different EIGRP process IDs.Automatic summarization was disabled.The hello timer for R1 was altered.The serial interfaces for both routers are in different networks.No feasible successors were found.13Refer to the exhibit. In the topology table, what do the numbers 3011840 and 3128695 repre the route metric that is applied to those EIGRP routes for this routerthe trustworthiness of the routing information sourcethe composite of the hop count and bandwidth to that destination networkthe total metric for that network as advertised by the EIGRP neighbor14Refer to the exhibit. EIGRP is the only routing protocol enabled on this network. No static rou configured on this router. What can be concluded about network 198.18.1.0/24 from the exh output?A route to network 198.18.1.0/24 is not listed in the routing table.Packets that are destined for 198.18.1.0/24 will be forwarded to 198.18.10.6.EIGRP will perform equal cost load balancing across two paths when forwarding packets 198.18.1.0/24.The router with interface 172.16.3.2 is a successor for network 198.18.1.0/24.15Refer to the exhibit. All interfaces have been configured with the bandwidths that are shown exhibit. Assuming that all routers are using a default configuration of EIGRP as their routing what path will packets take from the 172.16.1.0/16 network to the 192.168.200.0/24 network A,B,EA,C,EA,D,EPackets will load balance across the A,B,E and A,C,E paths.Packets will load balance across the A,B,E and A,D,E paths.Packets will load balance across the A,C,E and A,D,E paths.16 By default, which two metrics are used by EIGRP to determine the best path between netwoMTUloaddelaybandwidthreliability17 Which term defines a collection of networks under the administrative control of a single entitypresents a common routing policy to the Internet?autonomous systemcontiguous networksprocess IDBGPv18Refer to the exhibit. The company is using EIGRP with an autonomous system number of 10 between hosts on networks that are connected to router A and those that are connected to ro successful. However, users on the 192.168.3.0 network are unable to reach users on the 19 network. What is the most likely cause of this problem?IP classless is enabled and is causing the packet to drop.The command network 192.168.1.32 was not issued on router C.The routers are not configured in the same EIGRP routing domain.Automatic summarization of the networks is causing the subnetted routes to be dropped.19 In the command router eigrp 20, what is the purpose of the number 20?specifies the administrative distance for all EIGRP routesidentifies the autonomous system number this EIGRP process will advertisedetermines what metric is added to all advertised routesindicates the number of addresses in the EIGRP routing domain20 The show ip eigrp topology command output on a router displays a successor route and asuccessor route to network 192.168.1.0/24. In order to reduce processor utilization, what doe do when the primary route to this network fails?The router sends query packets to all EIGRP neighbors for a better route to network192.168.1.0/24.The DUAL FSM immediately recomputes the algorithm to calculate the next backup rout Packets that are destined for network 192.168.1.0/24 are sent out the default gateway in The backup route to network 192.168.1.0/24 is installed in the routing table.。
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网络学院第二学期 第六章 试题及答案
ERouting Chapter 6 - CCNA Exploration: 路由协议和概念 (版本4.0)1请参见图示。
网络管理员希望尽量减少 Router1 路由表中的条目数量。
管理员应该在该网络上使用什么技术？VLSMCIDR私有 IP 地址有类路由2 C IDR 对网络有哪两项好处？（选择两项。
）缩小路由表大小动态地址分配自动路由重分布减少路由更新流量在有类边界自动总结3在如图所示的网络中，从 C 类地址的主机部分借用了 3 个位。
在这三条点对点链路上，如果不使用VLSM，那么共有多少址没有被使用？341236841804下列哪些项包含在无类路由协议的路由更新中？（选择两项。
）32 位地址下一跳路由器接口子网掩码单播主机地址第 2 层地址5哪三种内部路由协议支持VLSM？（选择三项。
）OSPFRIP v1RIP v2EIGRPBGPSTP6网络管理员可在VLSM 的帮助下实现下列哪一项？在一个自治系统中使用一个子网掩码在相同的IP 地址空间中使用多个子网掩码在整个自治系统中使用IGRP 作为路由协议在自治系统中使用多种路由协议7如图所示，Router1 和Router2 之间新添加的以太网链路需要一个额外的子网。
要为此链路提供最多14 个可用地址同时又地址，应该在该网络上配置哪个子网地址？192.1.1.16/26192.1.1.96/28192.1.1.160/28192.1.1.196/27192.1.1.224/28192.1.1.240/288请参见图示。
下列哪个地址是图中某个子网的广播地址？192.168.4.3/29192.168.4.15/29192.168.4.65/26192.168.4.255/249某路由器的路由表中安装了一条到网络192.168.32.0/20 的总结路由。
该路由总结了哪些网络？192.168.0.0 – 192.168.32.0/24192.168.0.0 – 192.168.47.0/24192.168.32.0 – 192.168.47.0/24192.168.32.0 – 192.168.48.0/24192.168.32.0 – 192.168.63.0/2410请参见图示。
ccna2答案第五章共10页
第五章 RIPv1 CCNA2 Exploration: 路由协议和概念(2019-12-15 18:07:13)转载▼标签：杂谈分类： 2010｜CCNA2官方试题--路由1 窗体顶端ERouting Chapter 7 - CCNA Exploration: 路由协议和概念(版本 4.0)以下行显示在 show ip route 命令的输出中。
R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0该路由度量的值是什么？3122030120 窗体底端2 窗体顶端下列关于 RIPv1 特性的陈述中，哪两项是正确的？（选择两项。
）它是一种距离矢量路由协议。
它会在路由更新中通告路由的地址和子网掩码。
RIP 消息的数据部分封装在 TCP 数据段中。
RIP 消息的数据部分封装在 UDP 数据段中。
它每 15 秒广播一次更新。
它最多允许路由域中存在 15 台路由器。
窗体底端3 窗体顶端请参见图示。
图中所示的网络运行 RIPv1。
不久前其中添加了192.168.10.0/24 网络，该网络将只包含最终用户。
如果要防止向新网络中的最终用户设备发送 RIPv1 更新，同时允许将此新网络通告给其它路由器，应该在 Router1 上输入什么命令？Router1(config-router)# no router ripRouter1(config-router)# network 192.168.10.0Router1(config-router)# no network 192.168.10.0Router1(config-router)# passive-interface fastethernet 0/0Router1(config-router)# passive-interface serial 0/0/0窗体底端4 窗体顶端请参见图示。
CCNA第二学期练习答案chapter11
1Refer to the exhibit. What does the "O*E2" from the "O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, Serial0/0" line represent?an internal type 2 OSPF route.an external OSPF route at least two hops away.an external OSPF route from two different sources.an external OSPF route that will not increment in cost.a default route.The route was distributed into OSPF from a type 2 router.2Refer to the exhibit. What is the cost of the route to the 10.0.0.0 network?211017861.5443 What three parameters must be indentical between OSPF routers in order to form an adjace(Choose three.)area idK-valuesmetric valuehello intervalnetwork typeinterface type4 What does OSPF use to reduce the number of exchanges of routing information in networkslarge numbers of neighbors are present? (Choose two.)root routerbackup root routerdomain routerbackup domain routerdesignated routerbackup designated router5 What does OSPF use to calculate the cost to a destination network?bandwidthbandwidth and hop countbandwidth and reliabilitybandwidth, load, and reliablity6 A fully converged five router OSPF network has been running successfully for several weeksconfigurations have been saved and no static routes are used. If one router looses power an what information will be in its routing table after the configuration file is loaded but before OS converged?All routes for the entire network will be present.Directly connected networks that are operational will be in the routing table.Because the SPF algorithm has not completed all calculations, no routes will be in the taA summary route for all previously learned routes will automatically appear in the routingall LSPs have been received by the router.7Refer to the exhibit. Router A is correctly configured for OSPF. Which OSPF configuration st set of statements was entered for router B to generate the exhibited routing table?B(config-router)# network 192.168.1.0 0.0.0.3 area 0B(config-router)# network 10.16.1.0 0.0.0.224 area 0B(config-router)# network 10.16.1.0 255.255.255.224 area 0B(config-router)# network 192.168.1.0 255.255.255.255 area 0B(config-router)# network 10.0.0.0 255.255.255.255 area 08Refer to the exhibit. Which network command or set of sommands will cause OSPF to be en send and receive packets for any R1 interface in the exhibited subnets?R1(config-router)# network 10.0.0.0 0.0.0.0 area 0R1(config-router)# network 0.0.0.0 255.255.255.255 area 0R1(config-router)# network 10.1.0.0 0.0.0.255 area 0R1(config-router)# network 172.16.1.0 0.0.0.3 area 0R1(config-router)# network 10.0.0.0 0.0.255.255 area 0R1(config-router)# network 172.16.0.0 0.255.255.255 area 09Refer to the exhibit. What does the "2" stand for in the router ospf 2 statement?The number 2 is the autonomous system number.The number 2 indicates the number of networks advertised by OSPF.The number 2 identifies this particular instance of OSPF on this router.The number 2 indicates the priority of the OSPF process on this router.10Refer to the exhibit. All routers have been configured with the interface priorities that are sho routers were restarted simultaneously. The results of the DR/BDR election are shown. What concluded about this network?Router C cannot win a DR election under any circumstances.If the link for interface 192.168.1.4 goes down, router B will become the new DR.The highest router ID was most likely determined via an OSPF router-id statement or st If a new router is added with a higher router ID than router D, it will become the DR.11Refer to the exhibit. What configuration statements would give the results that are shown in t of the show ip protocols command?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 192.168.1.512Refer to the exhibit. How many OSPF adjacencies must be formed to build the complete top DR or BDR were not elected in this OSPF network?45671013 What is the default administrative distance for OSPF?9010011011512014Refer to the exhibit. Routers A, B, C, and D are all running OSPF with default router IDs and interface priorities. Loopback interfaces are not configured and all interfaces are operational.is the DR and router C is the BDR.What happens immediately after the following commands are entered on router A?A(config)# interface fa0/0A(config-if)# ip ospf priority 255A will become the DR. D will become the BDR.A will become the DR. C will remain the BDR.D will remain the DR. A will become the BDR.D will remain the DR. C will remain the BDR.15Refer to the exhibit. All routers are running OSPF. What cost would JAX put in its routing tab10.0.0.0/24 network?215615641785178716 What range of networks will be advertised in the OSPF updates by the commandRouter1(config-router)# network 192.168.0.0 0.0.15.255 area 100?192.168.0.0/24 through 192.168.0.15/24192.168.0.0/24 through 192.168.15.0/24192.168.15.0/24 through 192.168.31.0/24192.168.15.0/24 through 192.168.255.0/24192.168.16.0/24 through 192.168.255.0/2417Refer to the exhibit. The network administrator wants to set the router ID of Router1 to 192.1 What steps must the administrator take to accomplish this?shut down the loop back interfaceuse the OSPF router-id 192.168.100.1 commanduse the clear ip ospf process commandnothing, the router-id of Router1 is already 192.168.100.118Refer to the exhibit. When OSPF is operational in the exhibited network, what neighbor relat developed between Router1 and Router2?A FULL adjacency is formed.A 2WAY adjacency is formed.Router2 will become the DR and Router1 will become the BDR.Both routers will become DROTHERS.19Refer to the exhibit. Assuming that the routers have default interface OSPF priorities and no loopback interfaces, what two roles will router B play on each network segment? (Choose tw DR for network 192.168.1.200BDR for network 192.168.1.200DROTHER on 192.168.1.200DR for network 192.168.1.204BDR for network 192.168.1.204DROTHER on network 192.168.1.20420Refer to the exhibit. Router1 and Router2 are running OSPF. The show ip ospf neighbor c reveals no neighbors. What is a possible cause?OSPF autonomous system IDs do not match.OSPF process IDs do not match.OSPF network types are identical.OSPF hello or dead timers do not match.21Refer to the exhibit. Which command sequence on RouterB will redistribute a gateway of las the other routers in OSPF area 0?RouterB(config)# router ospf 10RouterB(config-router)# gateway-of-last-resort 172.16.6.6RouterB(config)# ip route 0.0.0.0 0.0.0.0 serial 0/0/0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# default-information originateRouterB(config)# router ospf 10RouterB(config-router)# default-network 172.16.6.6 0.0.0.3 area 0RouterB(config)# ip route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# ip default-route 0.0.0.0 0.0.0.0 172.16.6.6RouterB(config)# router ospf 10RouterB(config-router)# redistribute ip default-route22Refer to the exhibit. RouterA, RouterB, and RouterC in the diagram are running OSPF on the interfaces. Router D was just added to the network. Routers are configured with the loopbac interfaces (Lo 0) that are shown in the exhibit. What happens to the OSPF DR/BDR after Ro added to the network?RouterB takes over as DR and RouterD becomes the BDR.RouterD becomes the BDR and RouterA remains the DR.RouterD becomes the DR and RouterA becomes the BDR.RouterC acts as the DR until the election process is complete.RouterD becomes the DR and RouterB remains the BDR.There is no change in the DR or BDR until either current DR or BDR goes down.23 Which two statements describe the use of OSPF DR/BDR elections? (Choose two.)Elections are always optional.Elections are required in all WAN networks.Elections are required in point-to-point networks.Elections are required in broadcast multiaccess networks.Elections are sometimes required in NBMA networks.24Refer to the exhibit. The routers in the exhibit are using default OSPF configuration settings advertise all attached networks. If all of the routers start at the same time, what will be the re DR and BDR elections for this single area OSPF network? (Choose three.)HQ will be DR for 10.4.0.0/16.Router A will be DR for 10.4.0.0/16.HQ will be BDR for 10.4.0.0/16.Router A will be DR for 10.5.0.0/16.Remote will be DR for 10.5.0.0/16.Remote will be BDR for 10.5.0.0/16.25Refer to the exhibit. What must be received between neighbors to prevent the dead time tha in the exhibit from reaching zero?any traffic through the router interfacesrouting database updates hello packetsBPDU packets。
CCNA第二学期考试答案
以下是针对您未获得满分的试题给出的反馈。
某些交互式试题可能不显示您的答案。
分项分数：1与固定配置的交换机相比，模块化交换机具有哪两个优点？（请选择两项。
）正确响应您的响应每台交换机的成本更低可扩展性更高转发率更低需要的电源插座数目更少带宽聚合可以使用多个端口固定配置交换机价格较低，但是它具有指定数量的端口且不能添加端口。
它们提供的高速端口通常比较少。
为了在包含固定配置交换机的网络上扩展交换，需要购买更多的交换机。
这增加了需要使用的电源插座数量。
模块化交换机只需要购买额外的线卡便可以扩展。
带宽聚合也更容易，因为机箱的背板可以为交换机端口线卡提供所需的带宽。
此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.2 交换网络2思科无边界架构接入层的基本功能是什么？正确响应您的响应聚合第 2 层广播域聚合第 3 层路由边界为用户提供访问权提供高可用性思科无边界架构接入层的功能是为用户提供网络访问。
第 2 层广播域聚合、第 3 层路由边界聚合和高可用性是分布层的功能。
也有说答案是聚合第 3 层路由边界此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络3思科无边界架构分布层的基本功能是什么？正确响应您的响应充当主干聚合所有园区块聚合第 3 层路由边界为用户提供访问权思科无边界架构的分布层的一项基本功能是在不同的VLAN 之间路由。
充当主干和聚合园区块是核心层的功能。
为用户提供访问是接入层的功能。
此试题参考以下领域的内容：Routing and Switching Essentials• 1.1.1 融合网络4若将大端口密度、容错和低价作为重要指标，应使用哪个交换机外形因素？正确响应您的响应固定配置交换机模块化交换机可配备机架的1U 交换机可堆叠式交换机堆叠式交换机可以使用特殊电缆实现互联，从而在交换机之间提供高带宽的吞吐量，并像单个大型交换机一样运行。
CCNA第二学期
CCNA 2 - Module 1If a router cannot find a valid configuration file during the startup sequence, what will occur?The router will prompt the user for a response to enter setup mode.Refer to the exhibit. The network administrator has configured the router with the interface IP addresses shown for the directly connected networks. Pings from the router to hosts on the connected networks or pings between router interfaces are not working. What is the most likely problem?The interfaces must be enabled with the no shutdown command.Refer to the exhibit. What can be concluded from the routing table output in the exhibit? (Choose two.) The FastEthernet0/0 and Serial0/0/0 interfaces of this router were configured with an IP address and the no shutdown command.An IP packet received by this router with a destination address of 198.18.9.1 will be forwarded out of the Serial0/0/0 interface.Refer to the exhibit. The frame shown in the exhibit was received by the router. The router interfaces are operational. How will the router process this frame? (Choose two.)The router will change the frame type to one supported by the WAN link before forwarding the frame.The frame was received on the Fa0/0 interface of the router and will be s witched to the S0/0/0 interface.Passwords can be used to restrict access to all or parts of the Cisco IOS. Select the modes and interfaces that can be protected with passwords. (Choose three.)VTY interfaceconsole interfaceprivileged EX EC modeWhich two statements correctly describe the components of a router? (Choose two.)ROM contains diagnostics executed on hardware modules.Flash memory does not lose its contents during a reboot.Refer to the exhibit. After host 2 is connected to the switch on the LAN, host 2 is unable to communicate with host 1. What is the cause of this problem?The subnet mask of host 2 is incorrect.Host 1 and host 2 are on different networks.The switch needs an IP address that is not configured.The router LA N interface and host 1 are on different networks.The IP address of host 1 is on a different network than is the LAN interface of the router.Which are functions of a router? (Choose three.)packet s witchingsegmentation of broadcast domainsselection of best path based on logical addressingRefer to the exhibit. A ll routers have a route in its routing table to each network that is shown in the exhibit. Default routes have not been issued on these routers. What can be concluded about how packets are forwarded in this network? (Choose two.)If RouterA receives a packet that is destined for 192.168.3.146, it will be forwarded out interface S0/0/1.If RouterB receives a packet that is destined for 10.5.27.15, it will be forwarded out interface S0/0/1.The serial connection shown in the graphic needs to be configured. Which configuration commands must be made on the Sydney router to establish connectivity with the Melbourne site? (Choose three.) Sydney(config-if)# ip address 201.100.53.2 255.255.255.0Sydney(config-if)# no shutdownSydney(config-if)# clock rate 56000Refer to the exhibit. What can be concluded from the output of the running-configuration of a router? The commands that are dis played determine the current operation of the router.Refer to the exhibit. Host A pings host B. When R4 accepts the ping into the Ethernet interface, what two pieces of header information are included? (Choose two.)destination IP address: 192.168.10.134destination MAC address: 9999.DADC.1234What is the outcome of entering these commands?R1(config)# line vty 0 4R1(config-line)# password check123R1(config-line)# loginsets the password to be used for connecting to this router via T elnetWhich of the following is the correct flow of routines for a router startup?load bootstrap, load IOS, apply configurationWhat three processes does a router execute when it receives a packet from one network that is destinedfor another network? (Choose three.)decapsulates the Layer 3 packet by stripping off the Layer 2 frame headeruses the destination IP Address in the IP header to look up the next-hop address in the routing tableencapsulates the Layer 3 packet into the new Layer 2 frame and forwards it out the exit interfaceThe network administrator needs to connect two routers directly via their FastEthernet ports. What cable should the network administrator use?cross-overWhich two statements describe characteristics of load balancing? (Choose two.)Load balancing allows a router to forward packets over multiple paths to the same destination network.Unequal cost load balancing is supported by EIGRP.What information about the router and its startup process can be gathered from the output of the show version command? (Choose three.)the last restart methodthe configuration register settingsthe location from where the IOS loadedWhich interfaces in the exhibit could be used for a leased line WAN connection? (Choose two.)14From what location can a router load the Cisco IOS during the boot process? (Choose two.)TFTP serverFlash memoryA network administrator has just entered new configurations into Router1. Which command should be executed to save configuration changes to NVRAM?Router1# copy running-config startup-configWhat is the default sequence for loading the configuration file?NVRAM, TFTP, CONSOLEWhat header address information does a router change in the information it receives from an attached Ethernet interface before information is transmitted out another interface?the Layer 2 source and destination addressCCNA 2 - Module 2Which of the following are displayed by the Router# show cdp neighbors command? (Choose three.)platformholdtimelocal interfaceWhy is it advisable to enter a next-hop IP address when creating a static route whose exit interface is an Ethernet network?In a multi-access network, the router cannot determine the next-hop MAC address for the Ethernet frame without a next-hop address.The output of the Router# show interfaces serial 0/1 command displays the following: Serial0/1 is up, line protocol is down.What is the most likely cause for the line protocol being down?No clock rate has been set.A static route that points to the next hop IP will have what administrative distance and metric in the routing table?administrative distance of 1 and metric of 0Refer to the exhibit. What two commands will change the next-hop address for the 10.0.0.0/8 network from 172.16.40.2 to 192.168.1.2? (Choose two.)A(config)# no ip route 10.0.0.0 255.0.0.0 172.16.40.2A(config)# ip route 10.0.0.0 255.0.0.0 192.168.1.2Refer to the exhibit. A company network engineer is assigned to establish connectivity between the two Ethernet networks so that hosts on the 10.1.1.0/24 subnet can contact hosts on the 10.1.2.0/24 subnet. The engineer has been told to use only static routing for these company routers. Which set of commands will establish connectivity between the two Ethernet networks?R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1Refer to the exhibit. Which static route should be configured on Router1 so that hostA will be able to reach hostB on the 172.16.0.0 network?ip route 172.16.0.0 255.255.0.0 S0/0/0Which address can be used to summarize networks 172.16.0.0/24 thru 172.16.7.0/24?172.16.0.0/21Refer to the exhibit. What is the significance of the /8 in the route to the 10.0.0.0 network?It indicates the number of consecutive bits, from the left, in the destination IP address of a packet that must match 10.0.0.0 to use that route.What two devices are responsible for converting the data from the WAN service provider into a form acceptable by the router? (Choose two).a modema CSU/DSU deviceA network administrator enters the following command into Router1: ip route 192.168.0.0 255.255.255.0 S0/1/0. Router1 then receives a packet that is destined for192.168.0.22/24. After finding the recently configured static route in the routing table, what does Router1 do next to process the packet?encapsulates the packet into a frame for the WAN link and forwards the packet out the S0/1/0 interfaceWhich piece of information is available from examining the output of the command show ip interface brief?Interface IP addressWhich of the following is true regarding CDP and the graphic shown?By default, Router A will receive CDP advertisements from routers B and C.Which two statements describe functions or characteristics of CDP? (Choose two.)It starts up automatically and allows the device to detect directly connected neighbor devices that use CDP.It allows systems to learn about each other even if different network layer protocols are configured.Hosts on two separate subnets cannot communicate. The network administrator suspectsa missing route in one of the routing tables. Which three commands can be used to help troubleshoot Layer 3 connectivity issues? (Choose three.)pingtracerouteshow ip routeWhat happens to a static route entry in a routing table when the outgoing interface is not available?The route is removed from the table.The routers in the diagram use the subnet assignments shown. What is the most efficient route summary that can be configured on Router3 to advertise the internal networks to the cloud?192.1.1.0/25Refer to the exhibit. How will packets destined to the 172.16.0.0 network be forwarded? Router1 will perform recursive lookup and packet will exit S0/0.A router has one static route configured to each destination network. Which two scenarios would require an administrator to alter the static routes that are configured on that router? (Choose two.)The destination network no longer exists.A topology change occurs where the existing next-hop address or exit interface is not accessible.Refer to the exhibit. Given the output in the exhibit, how would a clock rate be determined for this link?The rate configured on the DCE determines the clock rate.Refer to the exhibit. Which set of commands will configure static routes that will allow the WinterPark and the Altamonte routers to deliver packets from each LAN and direct all other traffic to the Internet?WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1Refer to the exhibit. What two commands are required to provide connectivity betw een the 192.168.1.0 and 10.0.0.0 networks without requiring recursive lookup? (Choose two.)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 0/0/0CCNA 2 - Module 3Which two statements correctly describe the concepts of administrative distance and metric? (Choose two.)Administrative distance refers to the trustworthiness of a particular route.Routes with the smallest metric to a destination indicate the best path.Refer to the exhibit. Which statement correctly describes how R1 will determine the best path to R2?R1 will install an EIGRP route using network B in its routing table because the administrative distance of EIGRP is lower than RIP.Which two statements are true regarding classless routing protoc ols? (Choose two.) sends subnet mask information in routing updatesallows for use of both 192.168.1.0/30 and 192.168.1.16/28 subnets in the same topologyWhich command would the network administrator issue to determine if load balancing is in effect on a router?show ip routeWhich statement is true regarding routing protocols?EIGRP uses DUAL to calculate the shortest path and can be configured to do unequal cost load balancing.Which two conditions would create a setting where the use of a distance-vector routing protocol would be efficient? (Choose two.)the network is using a hub and spoke topologythe network is using a flat designWhat is the purpose of a routing protocol?It allows a router to share information about known networks with other rou ters.Which of the following best describes the operation of distance vector routing protocols? They send their routing tables to directly connected neighbors.Which of the following is associated with link-state routing protocols?shortest-path first calculationsWhy is fast convergence desirable in networks that use dynamic routing protocols? Routers may make incorrect forwarding decisions until the network has converged.Which of the following conditions must be met in order for a network to have con verged The routers in the network are operating with consistent routing knowledge.Which two statements are true regarding metrics? (Choose two.)EIGRP uses bandwidth as a metric.OSPF uses cost based on bandwidth as a metric.Which two statements are true regarding the advantages of the use of static routes? (Choose two).increased securitythe administrator maintains control over routingThe following line of code is displayed in a routing table:R 209.165.201.0/24 [120/2] via 192.168.252.2, 00:00:16, S0/0/0What can be concluded from this output?The value, 120, is used to determine the best path when a router has more than one routing protocol configured for the same destination network.What will be the result of the following commands?ORL(config)# interface fastethernet 0/0ORL(config-if)# ip address 172.16.3.1 255.255.255.0ORL(config-if)# no shutdownA routing table entry is made to the 172.16.3.0 network with a code of "C".An engineer creates a static route by entering the Router(config)# ip route 10.0.0.0 255.255.255.0 192.168.1.2 command. What can be concluded about this route?The administrative distance of this route is 1.Refer to the exhibit. Router1 and Router2 are running EIGRP. All interfaces are operational and packets can be forwarded between all networks. What information will be found in the routing table for Router1?The administrative distance of the route to network 172.16.0.0 will be 90.The following line of code is present in the routing table:O 10.16.1.0/27 [110/129] via 192.168.1.5, 00:00:05, Serial0/0/1What does the number 129 indicate in this output?The cost for this link has a value of 129.A growing medium-sized manufacturing company recently began to have routing instability issues. The company uses static routes and has a mixture of over 30 Cisco and non-Cisco routers. The network administrator has decided to convert the network to dynamic routing. What characteristics of protocols should be considered in this selection process?OSPF can be used between the routers.Refer to the exhibit. If RIP is the routing protocol, what is the value of the metric from router A to network 192.168.5.0/24?3A router learns two paths with equal metrics to a destination network via the RIP routing protocol. How will the router handle packets to the destination network?The router will install both routes in the routing table and load balance between the two.CCNA 2 - Module 4Which event will cause a triggered update?a route is installed in the routing tableThree routers running a distance-vector routing protocol lost all power, including the battery backups. When the routers reload, what will happen?They will send updates that include only directly connected routes to their directly connected neighbors.What does the RIP holddown timer do?instructs routers to ignore updates, for a specified time or event, about possible inaccessible routesWhich two statements are true regarding the function of the RIPv1 routing updates? (Choose two).updates are broadcast at regular intervalsbroadcasts are sent to 255.255.255.255Which of the following statements are correct about RIP?will send out an update if there is a failure of a linkWhich two statements describe EIGRP? (Choose two.)EIGRP sends triggered updates whenever there is a change in topology that influences the routing information.EIGRP sends a partial routing table update, which includes just routes that have been changed.Which statement is true regarding cisco’s RIP_JITTER variable?It prevents the synchronization of routing updates by subtracting a random length of time ranging from 0% to 15% of the specified interval time from the next routing update interval.What actions will occur after RouterA loses connectivity to network 114.125.16.0? (Choose two.)RouterB will include network 123.92.76.0 and 136.125.85.0 in its update to RouterA.Router C will learn of the loss of connectivity to network 114.125.16.0 from RouterB.Which of the following methods does split horizon use to reduce incorrect routing information?Information learned from one source is not distributed back to that source.The graphic shows a network that is configured to use RIP routing protocol. Router2 detects that the link to Router1 has gone down. It then advertises the network for this link with a hop count metric of 16. Which routing loop prevention mechanism is in effect?route poisoningWhat is the purpose of the TTL field in the IP header?limits the time or hops that a packet can traverse through the network before it should be discardedWhich of the following can exist in a distance vector network that has not converged? (Choose three.)routing loopsinconsistent traffic forwardinginconsistent routing table entriesRefer to the exhibit. The routers in this network are running RIP. Router A has not received an update from Router B in over three minutes. How will Router A respond?The Invalid timer will mark the route as unusable if an update has not been received in 180 seconds.A network administrator is evaluating RIP versus EIGRP for a new network. The network will be sensitive to congestion and must respond quickly to topology changes. What are two good reasons to choose EIGRP instead of RIP in this case? (Choose two.)EIGRP only updates affected neighbors.EIGRP updates are partial.Refer to the exhibit. What path will packets from the 192.168.1.0/24 network travel to reach the 10.0.0.0/8 network if RIP is the active routing protocol?The path will be router A -> router D -> router E.Which three routing protocols are distance vector routing proto cols? (Choose three).RIPv1EIGRPRIPv2What is a routing loop?a condition where a packet is constantly transmitted within a series of routers without ever reaching its intended destinationWhich two conditions are most likely to cause a routing loop? (Choose two.)inconsistent routing tablesincorrectly configured static routesWhat metric does the RIP routing protocol consider to be infinity?16What does a router running RIP do first with a new route that is received from an advertisement?adjusts the metric for the new route to show the added distance for the routeRefer to the exhibit. If all routers are using RIP, how many rounds of updates will occur before all routers know all networks?3CCNA 2 - Module 5Refer to the exhibit. The network that is shown is running RIPv1. The 192.168.10.0/24 network was recently added and will only contain end users. What command or set of commands should be entered on Router1 to prevent RIPv1 updates from being sent to the end user devices on the new network while still allowing this new network to be advertised to other routers?Router1(config-router)# passive-interface fastethernet 0/0The following line was displayed in the output of the show ip route command.R 192.168.3.0/24 [120/3] via 192.168.2.2, 00:00:30, Serial0/0What is the value of the routing metric?3Which of the following is considered a limitation of RIP v1?RIP v1 does not send subnet mask information in its updates.Refer to the exhibit. The Ethernet interface on Router2 goes down and the administrator notices that the route is still in the Router1 routing table. How much longer will Router1 keep the down network in its routing table before marking it as possibly down?155 secondsRefer to the exhibit. Router1 is running RIPv1. What command was entered into Router1 to configure the gateway of last resort?ip route 0.0.0.0 0.0.0.0 S0/0/1What are three characteristics of the RIPv1 routing protocol? (Choose three.)uses hop count as a metricconsiders a metric of 16 as infinitycalculates metrics using the Bellman Ford algorithmWhich of the following would be the correct command sequence to enable RIP on Router B for all connected networks?RouterB(config)# router ripRouterB(config-router)# network 198.16.4.0RouterB(config-router)# network 210.36.7.0RouterB(config-router)# network 220.17.29.0What is the default update period in seconds for the RIP routing protocol?30Refer to the exhibit. What can be concluded from the routing table output of router B? The default-information originate command has been entered on A.Refer to the exhibit. A network consists of multiple routers. What can be verified when the show ip protocols command is issued on one of the routers in the network? routing protocol configuration in use for IP on this routerRefer to the exhibit. All routers are configured with valid interface addresses in the indicated networks and are running RIPv1. The network is converged. Which routes are present in the routing tables?All routers have all /30 routes. Routers A and E also have some of the /24 routes in their routing table.Which two statements are true regarding the characteristics of RIPv1? (Choose two). It is a distance vector routing protocol.The data portion of a RIP message is encapsulated into a UDP segment.Which command or set of commands will stop the RIP routing process?RouterB(config)# no router ripRefer to the exhibit. All routers in the exhibit are running RIP v1. The network administrator issues the show ip route command on router A. What routes would ap pear in the routing table output if the network is converged? (Choose two).R 192.168.2.0/24 [120/1]R 10.10.1.0/24 [120/2]Which command will display RIP activity as it occurs on a router?debug ip ripRefer to the output from the show ip route command. What can be concluded from the output of this router command?There are two equal cost paths to network 1.0.0.0.Refer to the exhibit. Router1 and Router2 are running the RIPv1 protocol. The network administrator configures the command network 10.1.0.0 on Router1. What network will Router1 advertise to Router2?10.0.0.0/8Refer to the exhibit. Pings between the serial interfaces of the routers are successful. Hosts on each LAN can ping the Fa0/0 interface of the router to which they are directlyconnected through the switch. However, pings between hosts on the 10.1.1.0/24 and 10.1.2.0/24 networks are unsuccessful. What is a likely cause of this problem?RIP is configured incorrectly on R1.What will happen if an interface IP address is entered for the address portion of the network command in a RIPv1 configuration instead of a network address?All interfaces in the same classful network as the configured address will be included in the RIPv1 routing process.Refer to the exhibit. All routers that are shown are running the RIP routing protocol. All unknown IP traffic must be forwarded to the ISP. What router or set of routers are recommended to have both a default route and the default-information originate command issued to implement this forwarding policy?only the gateway routerCCNA 2 - Module 6What two advantages does CIDR provide to a network? (Choose two.)reduced routing table sizereduced routing update trafficRefer to the exhibit. The network administrator wants to create a subnet for the po int-to-point connection between the two routers. Which subnetwork mask would provide enough addresses for the point-to-point link with the least number of wasted addresses?255.255.255.252Refer to the exhibit. A network engineer is summarizing the two groups of routes on router R1 shown in the exhibit. Which summarization will work for all the subnets?192.168.0.0/21Which of the following are contained in the routing updates of classless routing protocols? (Choose two.)32-bit addresssubnet maskWhich of the following problems does VLSM help to alleviate?the shortage of IP addressesWhat does VLSM allow a network administrator to do?utilize multiple subnet masks in the same IP address spaceRefer to the exhibit. What subnet mask will be applied if Router A sends a RIPv1 update for the network 172.16.1.0 to Router B?24Refer to the exhibit. The network administrator wants to minimize the number of entries in Router1’s routing table. What should the administrator implement on the network?CIDRA router has a summary route to network 192.168.32.0/20 installed in its routing table. What range of networks are summarized by this route?192.168.32.0 – 192.168.47.0/24A network administrator is tasked with dividing up a class C network among the QA, Sales, and Administration departments. The QA department is made up of 10 people, the Sales is made up of 28 people, and the Administration has 6. Which two subnets masks adequately address the QA and Sales departments? (Choose two.)255.255.255.224 for Sales255.255.255.240 for QAIn the network shown in the graphic, three bits were borrowed from the host portion of a Class C address. How many valid host addresses will be unused on the three point-to-point links combined if VLSM is not used?84A Class C address has been assigned for use in the network shown in the graphic. Using VLSM, which bit mask should be used to provide for the number of host addresses required on Router A, while wasting the fewest addresses?/27An additional subnet is required for a new Ethernet link between Router1 and Router2 as shown in the diagram. Which of the following subnet addresses can be configured in this network to provide a maximum of 14 useable addresses for this link while wasting the fewest addresses?192.1.1.224/28Which three interior routing protocols support VLSM? (Choose three.)OSPFRIP v2EIGRPRefer to the exhibit. The number of required host addresses for each subnet in a network is listed in the exhibit. This number includes the host address requirements for all router ports and hosts on that subnet. After all device and router port address assignments are determined, what will be the total number of unused host addresses available?29Refer to the exhibit. In the network that is shown, the router interfaces are assigned the first address ineach subnet. Which IP address would be usable for a host on one of the LANs in this network?192.168.2.130/25Refer to the exhibit. Which address is a broadcast address for one of the subnets that are shown in the exhibit?192.168.4.15/29Refer to the exhibit. A network administrator needs to create two subnetworks from 10.0.0.0/8 for a router running RIPv2. The Admin subnet requires 120 hosts and the Sales subnet requires 58 hosts. The network administrator assigned 10.0.1.128/25 to the Admin subnet. The Sales subnet i s given 10.0.1.192/26. What will be the result of this addressing scheme?Because RIPv2 does not support VLSM, the subnet masks will not be allowed.The subnets overlap and will be rejected by the router.Refer to the exhibit. A network technician enters the static route in R1 needed to reach network 10.1.1.0/24. A ping from the S0/0/0 interface on R1 to host B fails. The technician begins testing the network and has the following results:1. pings from R1 to the S0/0/0 interface on R2....successful2. pings from R1 to the Fa0/0 interface on R2....successful3. pings from host B to hosts on the 10.1.1.0/24 network....successful4. pings from host B to the Fa0/0 interface on R2....successful5. pings from R2 to host B....successful.The default gateway on host B is not correctly set.What is a supernet?a summarization of classful addressesCCNA 2 - Module 7Refer to the exhibit. If all routers are running RIP version 2, why is there no route for the 192.168.1.32/27 network?Rip version 2 will auto summarize routes by default.Refer to the exhibit. Which two statements are true? (Choose two.)Router1 will install a route to 192.168.0.0/20Router2 will not install a route to 192.168.16.0/20Refer to the exhibit. Which command on which router will allow Router1 to learn about the 192.168.0.0/20 network?Router2(config-router)# version 2What are two reasons to implement RIP version 2 rather than RIP version 1? (Choose two.)RIP version 2 supports VLS M.。
思科网络学院 CCNA 2 练习题和答案 CCNA2 ERouting Chapter 10
CCNA资料 2009-10-13 14:47:29 阅读379 评论0 字号：大中小 订阅
Assessment Item:
Refer to the exhibit. If all routers and interfaces are configured to use a link-state routing protocol, from which routers will router D receive hello packets?
traffic would load balance across all links
Reset
Scoring Rule for: correctness of response
2 points for Option 3
Assessment Item:
Which algorithm is run by link-state routing protocols to calculate the shortest path to destination networks?
RIPv1
RIPv2
IS-IS
BGP
EIGRP
OSPF
Reset
Scoring Rule for: correctness of response
Option 3 and Option 6 are correct.
Assessment Item:
Which database or table must be identical on all link-state routers within an area in order to construct an accurate SPF tree?
CCNA第二学期第九章答案.
1 哪两项功能描述了访问控制列表的用途？（请选择两项。
）正确响应您的响应ACL 可以根据路由器上的始发 MAC 地址来允许或拒绝流量。
ACL 可以控制主机能够访问网络中的哪些区域。
ACL 可以帮助路由器确定到目的地的最佳路径。
标准 ACL 可限制对特定应用程序和端口的访问。
ACL 提供基本的网络安全性。
2 访问控制列表在企业网络中的可能用途是下列哪两项？（选择两项。
）正确响应您的响应控制路由器接口的物理状态控制调试输出允许通过路由器过滤第 2 层流量降低路由器上的处理负载控制虚拟终端对路由器的访问3 哪两个特征是标准 ACL 和扩展 ACL 共有的特征？（请选择两项。
）正确响应您的响应两者都可以通过使用描述性名称或号码创建。
两类ACL 都可以根据协议类型进行过滤。
两者都包含隐式 deny 作为最终 ACE。
两者都可以通过端口号允许或拒绝特定服务。
两者都可为特定目的主机 IP 地址过滤数据包。
4 下列哪项描述了标准 IPv4 ACL 的特点？正确响应您的响应创建它们时可以使用数字，但不可以使用名称。
它们是在接口配置模式下配置的。
可以根据源 IP 地址和源端口对过滤流量进行配置。
它们仅根据源 IP 地址过滤流量。
5 网络管理员需要配置标准 ACL，使得只有 IP 地址为 192.168.15.23 的管理员工作站能够访问主要路由器的虚拟终端。
哪两个配置命令可以完成该任务？（请选择两项。
）正确响应您的响应Router1(config)# access-list 10 permit 192.168.15.23 255.255.255.255Router1(config)# access-list 10 permit 192.168.15.23 0.0.0.0Router1(config)# access-list 10 permit 192.168.15.23 255.255.255.0Router1(config)# access-list 10 permit host 192.168.15.23 Router1(config)# access-list 10 permit 192.168.15.23 0.0.0.2556 哪一个 IPv4 地址范围包含由 172.16.2.0 指定的、与 ACL 过滤器匹配的、通配符掩码为 0.0.1.255 的所有 IP 地址？正确响应您的响应172.16.2.1 到 172.16.3.254172.16.2.1 到 172.16.255.255172.16.2.0 到 172.16.3.255172.16.2.0 到 172.16.2.2557 如果路由器有两个接口，并且路由 IPv4 和 IPv6 的流量，那么可以在其中创建并应用多少个 ACL？正确响应您的响应12616488 通常认为下列哪三项是安置 ACL 的最佳做法？（请选择三项。
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，会使用访问列表?A. to control vty access into a routerA.控制通过VTY访问器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.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。
CCNA2 思科第二学期 v2.0 ERouting Chapter 11 答案
请参见图示。
“O*E2 0.0.0.0/0 [110/1] via 192.168.1.1, 00:05:34, Serial0/0”一行中的“O*E2”代表什么含义？内部第2 类OSPF 路由。
距离至少两跳远的外部OSPF 路由。
来自两个不同源的外部OSPF 路由。
不会增加开销的外部OSPF 路由。
默认路由。
该路由是从第2 类路由器分布到OSPF 的。
2 points for Option 4请参见图示。
到10.0.0.0 网络的路由的开销是多少？211017861.5442 points for Option 3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Option 1, Option 4, and Option 5 are correct.在存在大量邻居的网络中，OSPF 会使用什么来减少路由信息的交换次数？（选择两项。
）根路由器备用根路由器域路由器备用域路由器指定路由器备用的指定路由器Option 5 and Option 6 are correct.OSPF 使用什么来计算到目的网络的开销？带宽带宽和跳数带宽和可靠性带宽、负载和可靠性2 points for Option 1包含五台路由器的完全收敛OSPF 网络已经正常运行数个星期。
所有配置都已保存，而且未使用任何静态路由。
如果其中一台路由器断电并重新启动，那么在配置文件加载之后、OSPF 收敛之前其路由表中包含什么信息？路由表中包含整个网络的所有路由。
路由表中将包含运行中的直连网络。
因为此时SPF 算法尚未完成所有计算，所以路由表中没有路由。
所有以前获知路由的总结路由将自动出现在路由表中，直到路由器接收到所有的LSP。
2 points for Option 2请参见图示。
路由器 A 已针对OSPF 进行了正确的配置。
要生成如图所示路由表，需要在路由器 B 上输入哪条或哪组OSPF 配置语句？B(config-router)# network 192.168.1.0 0.0.0.3 area 0B(config-router)# network 10.16.1.0 0.0.0.224 area 0B(config-router)# network 10.16.1.0 255.255.255.224 area 0B(config-router)# network 192.168.1.0 255.255.255.255 area 0B(config-router)# network 10.0.0.0 255.255.255.255 area 02 points for Option 1请参见图示。
CCNA最新中文版题库第二学期第四单元
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。
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。
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。
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。
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。
量总是根据跳数确定。
度量会根据所采用的第量会根据所采用的第 3 层协议（如层协议（如 IP 或 IPX ）而发生变化。
）而发生变化。
2 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完整的路由表更新发送给所有邻居受 RIP 第 1 版支持版支持允许在同一拓扑结构中同时使用许在同一拓扑结构中同时使用 192.168.1.0/30 和 192.168.1.16/28 子网子网减少组织中可用地址空间的大小少组织中可用地址空间的大小3 关于使用静态路由的优点，下列哪两项描述正确？（选择两项。
）安全性更高全性更高配置路由的工作量更少置路由的工作量更少管理员保持对路由的控制理员保持对路由的控制在不断扩展的网络中更容易实施不断扩展的网络中更容易实施降低了路由出错的几率低了路由出错的几率提高了路由资源的使用率高了路由资源的使用率4请参见图示。
如果路由协议为请参见图示。
如果路由协议为 RIP ，那么从路由器，那么从路由器 A 到网络到网络 192.168.5.0/24 的度量值是多少？的度量值是多少？ 3 4 56 624 724 5都运行 EIGRP。
所有接口都正常运行，并且数据包能在所有网络之间转发。
在Router1 请参见图示。
Router1 和Router2 都运行的路由表中可找到下列哪一项信息？的路由表中可找到下列哪一项信息？R outer1 有6 个直连网络。
CCNA网络学院第二学期 第二章 试题及答案
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。
路由器将轮询邻居以查找替用路由。
该路由将保持在路由表中，因为它是静态路由。
路由器将重定向该静态路由，以补偿下一跳设备的缺失。
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。
）路由器的串行端口调制解调器交换机路由器的以太网端口CSU/DSU 设备DTE 设备3请参见图示。
要使WinterPark 和Altamonte 路由器能够传送来自每个LAN 的数据包并将所有其它流量转到Internet，应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 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/1WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 198.18.222.0 255.255.255.255 s0/1WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1WinterPark(config)# ip route 0.0.0.0 0.0.0.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2WinterPark(config)# ip route 172.191.67.0 255.255.255.0 192.168.146.1Altamonte(config)# ip route 10.0.234.0 255.255.255.0 192.168.146.2Altamonte(config)# ip route 0.0.0.0 0.0.0.0 s0/04路由器配置有到达每个目的网络的静态路由。
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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 相连网络上的主机口之间相互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R4 收到对以太网接口的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 路由器上发出以下哪条配置命令才能与Melbourne 站点建立连接？（选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，主机2 无法与主机 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有到达如图所示每个网络的路由。
这些路由器上没有配置默认路由。
以下关于数据包在发方式的结论中，哪两项是正确的？（选择两项。
）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可得出什么结论？（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图中的哪些接口可用于租用线路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- ERoutingChapter 2 - CCNAExploration: 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Altamonte 路由器能够传送来自每个LAN 的数据包并将所有其它流量转到Internet，应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 0.0.0.0 0.0.0.0 s0/14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 网络的路由中，/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down（关闭）的原因最可能是什么？尚未设置时钟频率。
8请参见图示。
公司的网络工程师收到任务，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机通信。
该工程师被告知公司路由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 10.1.1.0 255.255.255.0 192.168.0.29两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子网分配。
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 A 能够连接到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，该链路的时钟频率会如何确定？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 网络之间连通并且无需递归查找，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 网络的下一跳地址从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 网络的数据包会被如何转发？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-ERoutingChapter 3- CCNAExploration: 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 之间最佳路径的陈述中，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。