思科第二学期答案

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思科第二学期期末试题及答案

Close WindowAssessment System 1. Assessment Selection 2. Assessment Settings 3. Take Assessment 1Refer to the exhibit. Which summarization should R1 use to advertise its networks to R2? 192.168.1.0/24 192.168.0.0/24 192.168.0.0/22 192.168.1.0/22 2If a router is booting with its default configuration register setting and its NVRAM lacks boot system commands, from try to load the IOS image first? ROM RAM NVRAM f lash flash TFTP server 3Refer 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. 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. A static route is established. The traffic for all Class C networks is forwarded to 172.16.1.2. 4Which two technologies can be used in distance vector routing protocols to prevent routing loops? (Choose two.) authentication link-state advertisements h old-down timers hold-down timers Spanning Tree Protocol split horizon 5Refer to the exhibit. What information can be determined from the displayed output? E IGRP packets are waiting to be sent to the neighbors. EIGRP packets are waiting to be sent to the neighbors. The adjacencies between the routers are yet to be established. The IP address 192.168.10.10 is configured at serial interface S0/0/1 of router R2. Router R2 is receiving hello packets from a neighbor with the IP address 192.168.10.10 via the R2 S0/0/1 interf6Which statement is true about the metrics used by routing protocols? A metric is a value used by a particular routing protocol to compare paths to remote networks. A metric is a value used by a particular routing protocol to compare paths to remote networks. A common metric is used by all routing protocols. The metric with the highest value is installed in the routing table. The router may use only one parameter at a time to calculate the metric. 7Which feature of RIPv2 enables it to function as a classless routing protocol? Subnet masks are included in routing updates. Routing updates are triggered by topology changes. Next-hop addresses are included in routing updates. N ext-hop addresses are included in routing updates. Multicast addresses are used to send routing updates. 8Refer to the exhibit. The hosts on the R1 LAN are unable to access the Internet. What is incorrectly configured? the IP address of the Fa0/0 interface at R1 t he IP address of the Fa0/0 interface at R1 the IP address of the S0/0/1 interface at R2 the IP address of the S0/0/0 interface at R1 the subnet mask of the S0/0/1 interface at R2 9Which prompt is used to allow a user to change the IP address of an interface on a router? Router> R outer> Router# Router(config)# Router(config-if)# 10Refer to the exhibit. The interfaces of all routers are configured for OSPF area 0. R3 can ping R1, but the two routeestablish a neighbor adjacency. What should the network administrator do to troubleshoot this problem? Check if the interfaces of the routers are enabled. Check the hello and dead intervals between the routers. C heck the hello and dead intervals between the routers. Check the process ID of both routers. Check if CDP is enabled on all the routers. 11Refer to the exhibit. Which combination of IP address and subnet mask can be used on the serial interface of Route interface in the same network as the serial interface of Router1? IP 172.16.0.18, subnet mask 255.255.255.0 IP 172.16.32.15, subnet mask 255.255.255.240 I P 172.16.32.15, subnet mask 255.255.255.240 IP 172.16.0.18, subnet mask 255.255.255.252 IP 172.16.32.18, subnet mask 255.255.255.252 12Refer to the exhibit. A network engineer has run the show version command on R3. Upon rebooting, R3 does not load configuration settings. What could be the cause of this problem? There is insufficient NVRAM. There is insufficient flash memory. The configuration register is not configured with the default setting. The system image file is not located in NVRAM. 13Refer to the exhibit. On the basis of the show running-config output, which option correctly reflects the routes that will b routing table? 14Refer to the exhibit. Host A is having problems accessing server A. All routers have the same EIGRP configuration a What should be done so that host A can access server A? Add the command n ono auto-summary on all routers. Change the network statements to include a wildcard mask. Adjust the EIGRP hello timers to account for the network delay. Add the command e igrpeigrp log-neighbor-changes on all routers. 15Refer to the exhibit. The network is running the RIP routing protocol. Network 10.0.0.0 goes down. Which statement is the routers in this topology will respond to this event? Router4 will learn about the failed route 30 seconds later in the next periodic update. Split horizon will prevent Router4 from fowarding packets to the 10.0.0.0 network until the holddown timer expire Router5 immediately flushes the unreachable route from its routing table. Router5 will send Router4 a triggered update with a metric of 16 for network 10.0.0.0. 16A network administrator is in charge of two separate networks that share a single building. What device will be require networks and add a common connection to the Internet that can be shared? hub router access point Ethernet switch E thernet switch 17Refer to the exhibit. A network administrator has configured OSPF using the following command: network 192.168.1.32 0.0.0.31 area 0Which router interface will participate in OSPF? FastEthernet0/0 FastEthernet0/1 Serial0/0/0 Serial0/0/1 18Refer to the exhibit. R1 is configured properly for a single area OSPF, and R2 has been recently installed in the netcommands 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 119Which 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. 20Which candidate route has the longest match for a packet with a destination address of 10.30.16.48? 10.30.0.0/16 10.30.15.0/23 10.30.16.0/24 10.30.16.32/27 10.30.16.32/30 21Which statement is true about the RIPv1 protocol? It is a link-state routing protocol. It excludes subnet information from the routing updates. It uses the DUAL algorithm to insert backup routes into the topology table. It uses classless routing as the default method on the router. 22Which of the following are primary functions of a router? (Choose two.) packet switching microsegmentation domain name resolution path selection flow control 23Refer to the exhibit. Partial results of the show running-config and s how show ip route commands are displayed. Router B rec with a destination address of 10.16.1.97. What will router B do? drop the packet forward the packet via the route to 10.16.1.0 f orward the packet via the route to 10.16.1.64 forward the packet via the route to 10.16.1.64 use the default route 24 What are two ways that a router can learn of the paths to destination networks? (Choose two.) updates from other routers DHCP information broadcasts m anual configuration of routes manual configuration of routes ARP requests from connected routers inspection of the destination IP address in data packets updates from the SMTP management information base 25Refer 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. T he Fa0/1 interfaces of the two routers are configured for different subnets. The subnet mask for the Fa0/0 interface of R1 is incorrect. 26A network administrator is analyzing routing update behavior on a network that has both EIGRP and OSPF configured protocols appear in the output of show ip protocols. However, only EIGRP internal routes appear in the routing tables. correctly explains the scenario? The OSPF protocol has a higher cost than EIGRP. T he OSPF protocol has a higher cost than EIGRPThe EIGRP protocol has a lower metric than OSPF. The EIGRP protocol was configured first on the router. The EIGRP protocol has a lower administrative distance than OSPF. 27Refer to the exhibit. The network has three connected routers: R1, R2, and R3. The routes of all three routers are d are operational and pings are not blocked on this network. Which ping will fail? from R1 to 172.16.1.1 from R1 to 192.168.3.1 from R2 to 192.168.1.1 from R2 to 192.168.3.1 28Refer to the exhibit. A device is required to complete the connection between router R1 and the WAN. Which two de this? (Choose two.) a CSU/DSU device a modem a n Ethernet switch an Ethernet switch a hub a bridge 29 In which situation would a default static route be recommended? when connecting an edge router to the Internet w hen variable length subnet masking is in effect when variable length subnet masking is in effect when there is more than one valid route for a destination network when a destination network has a larger mask than any routes in the routing table 30 Two routers need to be configured within a single OSPF area. Which two components need to be configured on boththis? (Choose two.) t he same process ID the same process ID the same area ID network addresses and wildcard masks the same router ID the same loop back address 231Refer 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. 32Refer to the exhibit. A router learns a route to the 192.168.6.0 network, as shown in the output of the show ip rip database However, upon running the show ip route command, the network administrator sees that the router has installed a diff command, the network administrator sees that the router has installed a diffe 192.168.6.0 network learned via EIGRP. What could be the reason for the missing RIP route? Compared to RIP, EIGRP has a lower administrative distance. Compared to EIGRP , RIP has a higher metric value for the route. Compared to RIP , the EIGRP route has fewer hops. Compared to RIP , EIGRP has a faster update timer. 33 Which mechanism helps to avoid routing loops by advertising a metric of infinity? route poisoning split horizon hold-down timer triggered updates 34 A network administrator must use the subnet 172.16.128.0/18 to create 6 additional subnets each containing up to 20LANs. Which subnet mask should the administrator use to create the new subnets? 255.255.224.0 255.255.240.0 255.255.248.0 255.255.252.0 35 A technician configures the Fa0/0 interface on a router with ip address 192.168.3.5 255.255.255.252. What additional com. What additional com issued by the technician to activate the interface to forward traffic? Router(config-if)# exitRouter(config-if)# no shutdownRouter(config-if)# clock rateRouter# copy running-config startup-config36 Because of a topology change, the next hop IP address in the current static route must be reconfigured. How can a altered to accommodate a topology change? Keep the existing static route and configure a new static route with the correct next hop IP address. Negate the existing static route and configure a new static route with the correct next hop IP address. D o nothing. The existing static route will automatically update the next hop entry with the new IP address. Do nothing. The existing static route will automatically update the next hop entry with the new IP address. Keep the existing static route, reload the router, and configure a new static route with the correct next hop IP a37Refer to the exhibit. What needs to be done to allow these two routers to connect successfully? Add a clock rate to S0/0/0 on R1. Add an interface description to S0/0/1 on R2. C hange the serial interface on R2 to S0/0/0 so that it matches R1. Change the serial interface on R2 to S0/0/0 so that it matches R1. Change the IP address of S0/0/1 on R2 so that it is in the same subnet as R1. 38Refer 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. 39 Why is fast convergence desirable in networks that use dynamic routing protocols? Hosts are unable to access their gateway until the network is converged. Routers will not allow packets to be forwarded until the network is converged. Routers may make incorrect forwarding decisions until the network has converged. Routers will not allow configuration changes to be made until the network has converged. 40Refer to the exhibit. When all of the commands that are shown in the exhibit are entered at the correct router promp the router? name cisco router hostname 41Refer to the exhibit. Packets destined to which two networks will require the router to perform a recursive lookup? (C10.0.0.0/8 64.100.0.0/16 128.107.0.0/16 172.16.40.0/24 192.168.1.0/24 192.168.2.0/24 42Refer to the exhibit. A router interface is configured with the command ip address 172.16.3.31 255.255.192.0. Which set o. Which set o values would allow a computer that is connected to the router interface to communicate with remote networks? A: 172.16.3.254 A: 172.16.3.254 B: 255.255.192.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.192.0 C: 172.16.3.255 A: 172.16.3.254 B: 255.255.255.0 C: 172.16.3.31 A: 172.16.3.31 B: 255.255.255.0 C: 172.16.3.1 43Which three statements are true regarding the encapsulation and de-encapsulation of packets when traveling through three.) The router modifies the TTL field, decrementing it by one. The router changes the source IP to the IP of the exit interface. The router maintains the same source and destination IP. The router changes the source physical address to the physical address of the exit interface. The router changes the destination IP to the IP of the exit interface. The router sends the packet out all other interfaces, besides the one it entered the router on. 44Refer 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. N o default route has been configured. 45Refer to the exhibit. Which route will be installed in the routing table on R1 to forward traffic from PC1 to the web s the static route the route learned via OSPF the route learned via EIGRP both routes learned via OSPF and EIGRP 46Refer to the exhibit. Based on the partial output in the exhibit, why can users establish a console connection to this r a password? The login command was not entered on the console line. The enable password should be an enable secret password. No username and password combination has been configured. Console connections cannot be configured to require users to provide passwords. 47Refer 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? ADC ABC It will load balance the traffic between ADC and ABC It will send the traffic via ABC, and will use ADC as a backup path only when ABC fails. 48A router learns about network 192.168.10.128/27 from multiple sources. Which option represents the best route and w routing table? S 192.168.10.128/27 [1/0] via 192.168.10.226 R 192.168.10.128/27 [120/2] via 192.168.10.226, 00:00:14, Serial0/0/0 O 192.168.10.128/27 [110/1563] via 192.168.10.226, 00:00:09, Serial0/0/0 D 192.168.10.128/27 [90/21026560] via 192.168.10.226, 00:00:16, Serial0/0/0 49Refer to the exhibit. R1 and R2 are adjacent routers both running RIP. All interfaces on both routers are correctly cothe routing table. What is the likely cause? The adjacent interfaces are passive. The distance of 120 exceeds 15 hops. R2 will not accept version 1 updates from R1. Routes are being summarized by R1 but not by R2. 50It is saved in the topology table for use if the primary route fails. It may be backed up by a feasible successor route. It is used by EIGRP to forward traffic to the destination. It is flagged as active in the routing table. After the discovery process has occurred, the successor route is stored in the neighbor table. 51Refer to the exhibit. PC1 is unable to access the Internet. What is the cause of the problem? An incorrect IP address is configured between the two routers. No static route is configured on Router2. A routing loop has occurred. No routing protocol is configured on either of the two routers. 52Refer to the exhibit. A technician has configured the interfaces on the Router, but upon inspection discovers that inte FastEthernet0/1 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. 。

思科第2学期答案

1下列哪两种网络设计功能需要生成树协议 (STP)来确保正确的网络操作？（请选择两项。

）静态默认路由实施 VLAN 以包含广播第 2 层交换机之间的冗余链路提供冗余路由的链路状态动态路由消除多个第 2 层交换机的单点故障答案说明最高分值correctness of response Option 3 and Option 5 are correct. 22第 2 层环路有什么特征？广播帧转发回发送方交换机。

帧的生存时间属性设置为无限。

路由器连续向其他路由器转发数据包。

交换机连续转发相同的单播帧。

答案说明最高分值correctness of response Option 123第 2 层广播风暴的结果是什么？交换机拥塞时，路由器将接管转发帧的角色。

新的流量将会被交换机因无法处理而丢弃。

CSMA/CD 将使每台主机继续传输帧。

ARP 广播请求返回发送方主机。

答案说明最高分值correctness of response Option 224哪种信息包含 BPDU 中的 12 位扩展系统 ID ？MAC 地址VLAN IDIP 地址端口 ID答案说明最高分值correctness of response Option 225下列哪三个部分可以组合形成网桥 ID ？端口IDIP 地址扩展系统IDMAC 地址网桥优先级开销答案说明最高分值 correctness ofresponse Option 3, Option 4, and Option 5 are correct.36哪个 STP 优先级配置可以确保交换机始终是根交换机？spanning-tree vlan 10 priority 0spanning-tree vlan 10 priority 61440spanning-tree vlan 10 root primaryspanning-tree vlan 10 priority 4096答案说明最高分值correctness of response Option 127下列哪种协议提供多达 16 个 RSTP 实例，能将具有相同物理和逻辑拓扑的多个 VLAN 结合为实例，并为 PortFast 、BPDU 防护和 BPDU 过滤、根防护和环路防护提供支持？STP快速PVST+PVST+ MST答案说明最高分值correctness of response Option 428由于假设整个桥接网络中只有一个生成树实例，哪两种生成树协议可能导致不理想的数据流？项。

CISCO第二学期期末考试答案

客户向ISP 技术人员反映连通性问题。

技术人员就相关问题询问客户之后，发现除了FTP 外，所有网络应用程序都正常。

技术人员怀疑出现了什么问题？防火墙配置有误/ 交换机或集线器端口损坏）/I n t e r n e t服务器将把数据发送至客户端端口8547。

/ 端口过滤和访问列表通过什么方式来增强网络安全？防止特定类型的通信到达特定网络主机。

/遭受各类拒绝服务攻击时提醒网络管理员。

防止病毒、蠕虫和特洛伊木马感染主机计算机和服务器。

可对机密数据通信进行加密和身份认证。

某黑客尝试获取存储在公司网络内部某台服务器上的机密信息。

网络安全解决方案检测完整的数据包，确定这是一个威胁，所以阻止该数据包进入内部网络。

这一过程中哪项安全措施保护了网络？IDSIPS /基于主机的防火墙此命令是从哪一台路由器执行的？ABC /D请参见图示。

网络管理员使用以下命令在RTB 上配置了一条默认路由：RTB(config)# ip route 0.0.0.0 0.0.0.0 fa0/0PC3 可以成功ping 通RTB。

但是当从PC3 发出的回应请求数据包到达PC1 后，却没有应答返回PC3。

怎样解决此问题？必须对RTA 进行配置，使其可以将数据包转发至192.168.2.0 网络。

需要修改ip route 命令，以便将下一跳地址设置为10.1.1.5。

/OSPFEIGRPRIPBGP /下列关于FTP 协议被动数据连接的说法中哪一项正确？服务器发起数据传输连接。

服务器将其IP 地址和一个随机端口号通过控制流转发给FTP 客户端。

/防火墙不会允许与网络内的主机进行被动数据连接。

客户端将数据转发至服务器的端口21。

下列关于反向查找DNS 区域的说法中哪一项正确？将会降低网络速度。

可对传输中的数据进行加密。

当路由协议交换有关直连网络的信息时，哪种路由将自动添加到邻居路由器的路由表中？动态路由/静态路由默认路由直连路由哪项网络地址和子网掩码的组合可使每个子网连接62 台主机？网络地址10.1.1.4 子网掩码255.255.255.240网络地址10.1.1.0 子网掩码255.255.255.252网络地址10.1.1.0 子网掩码255.255.255.192 /是一种可靠的传输协议。

思科第二期第十一章答案

1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请参见图示。

当图示网络中的OSPF 正常工作时，Router1 和Router2 之间将形成什么邻居关系？形成完全(FULL) 邻接关系。

形成双向(2WAY) 邻接关系。

Router2 将成为DR，Router1 将成为BDR。

两个路由器将成为DROTHERS。

3请参见图示。

路由器A、B、C 和 D 都在运行OSPF，它们均采用默认的路由器ID 和OSPF 接口优先级。

环回接口尚未配置，所有接口都运行正常。

路由器 D 是DR，而路由器 C 是BDR。

在路由器 A 上输入以下命令后将会立即发生什么情况？A(config)# interface fa0/0A(config-if)# ip ospf priority 255A 将成为DR。

D 将成为BDR。

A 将成为DR。

C 仍为BDR。

D 仍为DR。

A 将成为BDR。

D 仍为DR。

C 仍为BDR。

4请参见图示。

router ospf 2语句中的“2”代表什么？数字 2 是自治系统编号。

数字 2 表明OSPF 通告的网络个数。

数字 2 标识该路由器上特定的OSPF 实例。

思科第二期考试试题及答案(正确率100%)

参加考试 - ERouting Final Exam - ${COURSENAME} (版本 ${VERSION}) 窗体顶端剩余时间:窗体底端1窗体顶端请参见图示。

哪台路由器会通告子网 172.16.1.32/28？Router1Router2Router3Router4窗体底端窗体顶端请参见图示。

所有路由器都运行相同的路由协议。

根据图示及其显示的命令，下列哪一项叙述正确？通配符掩码配置有误。

必须在每台路由器上配置默认路由。

路由器 B、C 和 D 无法访问 Internet。

路由协议进程未通告通往 ISP 的链路。

窗体底端3 窗体顶端请参见图示。

所有路由器都运行 RIPv1。

10.1.1.0/29 和 10.1.1.16/29 这两个网络无法互相访问。

此问题的原因可能是什么？因为 RIPv1 是无类协议，不支持该访问。

RIPv1 不支持不连续网络。

RIPv1 不支持负载均衡。

RIPv1 不支持自动总结。

窗体底端窗体顶端请参见图示。

路由器 R1 和 R2 通过其串行接口直接相连，并且都在运行 EIGRP 路由协议。

R1 和 R2 可以 ping 通其邻居的直连串行接口，但无法与邻居建立起EIGRP 相邻关系。

应采取什么措施来解决此问题？启用两台路由器的串行接口。

配置 EIGRP 以发送定期更新。

在路由器之间配置相同的 hello 发送间隔。

使用相同的 EIGRP 进程 ID 配置两台路由器。

窗体底端5窗体顶端请参见图示。

对于发往 192.168.2.0 的数据包，R2 会采取什么操作？它会丢弃数据包。

它会通过 S0/0/0 接口转发数据包。

它会通过 Fa0/0 接口转发数据包。

它会将数据包转发给 R1。

窗体底端窗体顶端请参见图示。

为实施 RIPv2 协议，网络管理员运行了所示命令。

但是， show ip protocol 命令未显示任何输出。

管理员应如何解决该命令没有输出的问题？添加 default-information originate 命令。

思科第2学期第1章答案

1 企业级设备的哪两个功能有助于企业网络维持 99.999% 的正常运行？（请选择两项。

）故障切换功能折叠核心冗余电源故障域服务模块答案说明最高分值correctness of response Option 1 and Option 3 are correct. 22请参见图示。

当交换机 S3 断电时，故障域中存在哪些设备？S4 和PC_2PC_3 和AP_2AP_2 和 AP_1PC_3 和PC_2S1 和 S4答案说明最高分值correctness of response Option 2 23 哪个设计特点将限制企业网络中故障域的大小？使用折叠核心设计使用建筑物交换块方法安装冗余电源购买专门用于大流量的企业设备答案说明最高分值correctness of response Option 2 24 企业网络如何设计才能优化带宽？安装具备故障切换功能的设备限制故障域的大小部署折叠核心模型组织网络以控制流量模式答案说明最高分值correctness of response Option 4 25 当设计交换网络包含冗余链路时，需要哪种技术？链路聚合生成树协议虚拟专用网络虚拟 LAN答案说明最高分值correctness of response Option 2 26 网络管理员正在规划交换网络中的冗余设备和布线来支持高可用性。

实施生成树协议对此设计有什么好处？多个物理接口可以合并到一个 EtherChannel 接口。

冗余路径可用，且不会引起第 2 层逻辑环路。

网络访问可以进行扩展，以支持有线和无线设备。

高级路由协议可以实现快速融合。

答案说明最高分值correctness of response Option 2 27 通过无线介质扩展接入层的用户访问有哪两个好处？（请选择两项。

）提高灵活性减少关键故障点次数降低成本提高带宽可用性增强网络管理选项答案说明最高分值correctness of response Option 1 and Option 3 are correct. 28 作为一名网络管理员，您需要在公司网络上实施 EtherChannel。

思科第2学期第4章答案

1下列哪两项是路由器的功能？（选择两项。

）连接多个 IP 网络。

通过使用第 2 层地址控制数据流。

确定发送数据包的最佳路径。

管理 VLAN 数据库。

扩大广播域。

答案答案最高分值correctnes s of response Option 1 and Option 3 are correct.22为了将数据包发送到远程目的地，必须对主机上的哪三条信息进行配置？（请选择三hostnameIP 地址子网掩码默认网关DNS 服务器地址DHCP 服务器地址答案答案最高分值correctnes s of response Option 2, Option 3, and Option 4 are correct.required.33请参见图示。

如图所示，网络管理员已配置了 R1。

当管理员检查串行接口的状态时，管理性关闭。

要打开 R1 的串行接口，必须在其中额外输入什么命令？ipv6 enableclockrate 128000 endno shutdown答案答案最高分值correctness ofresponseOption 424哪一项功能可以将路由器与第 2 层交换机区别开来？路由器可以配置 IP 地址。

交换机不能。

交换机将数据包从一个物理接口转发到另一个物理接口。

路由器不是这样。

交换机使用信息表确定如何处理数据流量。

路由器不是这样。

路由器支持多种类型的接口。

交换机通常支持以太网接口。

答案答案最高分值correctnes s of response Option 425为了使路由器能够手动将指定的网络前缀与自动生成的接口标识符相组合在一起，可命令在路由器接口上配置 IPv6 地址？ipv6 enableipv6 address ipv6-address/prefix-lengthipv6 address ipv6-address/prefix-length eui-64ipv6 address ipv6-address/prefix-length link-local答案答案最高分值correctnes s of response Option 326启用了 IPv6 接口要求的最低地址类型是什么?环回唯一本地本地链路静态全局单播答案答案最高分值correctnes s of response Option 327 哪两条信息会显示在show ip interface brief命令的输出结果中？（请选择两项IP 地址MAC 地址第 1 层状态下一跳地址接口描述速度和双工设置答案答案最高分值correctnes s of response Option 1 and Option 3 are correct.28当一台计算机第一次 ping 另一台计算机时，需要将什么类型的消息放在网络上以确备的 MAC 地址？一个ICMP ping一个 ARP 请求一条 RFI（信息请求）消息发送给所有连接到本地网络的第 3 层设备的组播答案答案最高分值correctnes s of response Option 229请参见图示。

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参加考试 - ERouting Final Exam - CCNA Exploration: 路由协议和概念 (版本 4.0)1.请参见图示。

哪一项是对连接到路由器 R1 的路由的最有效总结？198.18.0.0/16198.18.48.0/21198.18.32.0/22198.18.48.0/23198.18.49.0/23198.18.52.0/222.下列关于路由协议的陈述，哪三项是正确的？（选择三项。

）EIGRP 支持不等价负载均衡。

RIP 无法配置为允许无类路由。

OSPF 在多路访问链路上选举指定路由器。

RIP 不通告跳数超过 15 的路由。

EIGRP 使用广播流量与其邻居建立相邻关系。

OSPF 能够更迅速地收敛，因为在后继路由失效时，它能够在其拓扑表中找出可行后继路由。

3.请参见图示。

该网络正在运行 RIP 路由协议。

网络 10.0.0.0 突然断开。

下列有关此拓扑结构中路由器如何响应该事件的陈述中，哪一项是正确的？Router4 将在 30 秒之后的下一次定期更新中获知该失效路由。

在抑制计时器超时之前，水平分割将阻止 Router4 向 10.0.0.0 网络转发数据包。

Router5 将立即从路由表中清除这一失效路由。

Router5 将向 Router4 发送触发更新，其中网络 10.0.0.0 的度量为 16。

4.请参见图示。

根据图中所示的拓扑结构，要在 Paris 路由器上配置 EIGRP 需要使用哪三条命令？（选择三项。

）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 192.168.9.05.请参见图示。

多少条路由既是 1 级路由，又可作为最终路由使用？1234566.请参见图示。

图中的路由器运行的是 EIGRP 路由协议。

关于数据包如何从172.16.1.0/16 网络传输到 192.168.200.0/24 网络的陈述，哪一项正确？路由器会选择所获知的第一条路径，并只将这条路径加入路由表。

路由器会选择管理距离最短的路径，并只将这条路径加入路由表。

路由器会根据通告的网络 IP 地址选择最大的路由 ID，并只将这条路径加入路由表。

路由器会将所有等价路径加入路由表，但只沿一条路径发送数据包，其它则作为主路由无效时的备用路径。

路由器会将所有等价路径加入路由表，并在这些路径上实施等价负载均衡，从而将数据包从多个输出接口发送出去。

7.请参见图示。

从 172.16.1.0/24 网络到 10.0.0.0/24 网络的流量会选用哪条路径？ADCABC流量会在 ADC 和 ABC 之间执行负载均衡流量会通过 ABC 传输，ADC 则作为 ABC 失效时的备用路径。

8.请参见图示。

根据如图所示的输出，下列哪两项陈述是正确的？（选择两项。

）所有路由都处于稳定状态。

每条路由都有一个可行后继。

两台路由器之间的串行接口关闭。

EIGRP 的管理距离已设置为 50。

R1 上已运行了 show ip eigrp topology 命令。

9.请参见图示。

公司网络工程师在路由器上输入以下命令：R1(config)# ip route 10.1.1.0 255.255.255.0 192.168.0.2R2(config)# ip route 10.1.2.0 255.255.255.0 192.168.0.1当工程师在 R1 上输入 show ip route 命令时，路由表没有显示到 10.1.1.0 网络的静态路由。

R1 和 R2 的所有接口都按照图示配置了正确的地址。

要使 R1 的路由表显示该静态路由，工程师下一步应该做什么？在路由器 R1 和 R2 中输入默认路由。

启用 R1 和 R2 的串行接口。

配置该静态路由，使用送出接口来取代下一跳地址。

输入 copy run start 命令，强制路由器识别该配置。

10.网络管理员在所示网络图中的路由器 B 和 C 上启用了 RIP。

什么命令可防止向路由器 A 发送 RIP 更新？A(config)# router ripA(config-router)# passive-interface S0/0B(config)# router ripB(config-router)# network 192.168.25.48B(config-router)# network 192.168.25.64A(config)# router ripA(config-router)# no network 192.168.25.32B(config)# router ripB(config-router)# passive-interface S0/0A(config)# no router rip11.网络管理员在 Router_A 上配置了一条默认路由，但该路由没有共享给邻接路由器 Router_B 以及该 OSPF 区域中的其它路由器。

使用哪条命令可以简单快速地将该默认路由配置到 Router_B 及该 OSPF 区域内的所有其它路由器上？Router_A(config-router)# ospf redistribute default-routeRouter_B(config-router)# ospf redistribute default-routeRouter_A(config-router)# default-information originateRouter_B(config-router)# default-information originateRouter_A(config-router)# ip ospf update-defaultRouter_B(config-router)# ip ospf update-default12.为了使运行 OSPF 的路由器通告区域 0 中 172.16.0.0/19 所包含的整个地址范围，网络管理员应使用什么命令？R1(config-router)# network 172.16.0.0 0.0.0.255 area 0R1(config-router)# network 172.16.0.0 0.0.3.255 area 0R1(config-router)# network 172.16.0.0 0.0.15.255 area 0R1(config-router)# network 172.16.0.0 0.0.31.255 area 013.请参见图示。

网络中的所有路由器均运行 RIPv2 和 EIGRP，并且都是默认的路由协议设置，这些路由器的接口上配置的带宽如图所示。

Router1 LAN 和Router5 LAN 之间会使用何种协议，两者之间的流量会如何通过网络进行路由？RIPv2 会在 Router1 和 Router5 之间的两条路径上实施负载均衡。

EIGRP 会在 Router1 和 Router5 之间的两条路径上实施负载均衡。

RIPv2 流量会采用 Router1、Router2、Router5 路径，因为此路径的跳数最少。

EIGRP 流量会采用 Router1、Router3、Router4、Router5 路径，因为此路径具有最佳度量。

14.请参见图示。

网络管理员正在尝试确定为什么路由器 JAX 的路由表中没有OSPF 路由。

所有路由器都配置了 OSPF 区域 0。

从 JAX 路由器上，管理员可以 ping 通与其连接的接口和 ORL 路由器的 Fa0/1 接口，但无法 ping 通其它路由器接口。

网络管理员下一步应采取什么步骤来排查问题？重新启动路由器。

将所有路由器上的 OSPF 进程 ID 更改为 0。

检查 ORL 和 JAX 之间的电缆是否松动。

检查路由器之间是否在传递 CDP 数据包。

使用 show 和 debug 命令确定是否在传播 hello 数据包。

15.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。

）链路状态路由协议了解整个网络的拓扑结构。

链路状态路由协议可以使大型网络快速达到收敛。

链路状态路由协议的路由更新中不包含子网掩码。

链路状态路由协议根据跳数从高到低的顺序来确定最佳路径。

链路状态路由协议不适合具有特定层次结构的网络。

链路状态路由协议仅向直连的邻居发送整个路由表。

16.请参见图示。

BOS Fa0/0 LAN 上的主机能够 ping 通 JAX 路由器的 Fa0/1 接口以及 BOS 和 ORL 路由器上的所有接口。

为什么 10.0.0.0/24 网络中的主机无法 ping 通 JAX 路由器 Fa0/0 LAN 中的主机？JAX 路由器的进程 ID 错误。

JAX 路由器需要 network 10.0.0.0 0.0.0.255 area 0 命令。

JAX 路由器需要 network 192.168.3.0 0.0.0.255 area 0 命令。

BOS 路由器需要 network 192.168.3.0 0.0.0.255 area 0 命令。

17.下列路由器组件和操作的配对中，哪两项是正确的？（选择两项。

）DRAM - 加载 bootstrapRAM - 存储操作系统闪存 - 启动时执行诊断NVRAM - 存储配置文件ROM - 存储备份配置文件POST - 运行硬件模块诊断18.哪三项是 CDP 的特性？（选择三项。

）测试第 2 层连通性提供安全层工作在 OSI 第 2 层和第 3 层默认在每个接口上启用用于调试第 4 层连通性问题提供关于已启用 CDP 的直连设备的信息19.请参见图示。

在路由器上执行如图所示的命令会产生什么效果？所有的口令都将加密。

仅加密 Telnet 会话。

仅加密使能口令。

仅加密使能口令和 Telnet 会话。

将加密使能口令和控制台口令。

20.下列关于 EIGRP 路由操作的描述，哪三项是正确的？（选择三项。

）一旦发现新邻居，便会向邻居表中加入条目。

如果可行后继路由相对于当前后继路由具有更高的通告开销，该可行后继路由即成为主路由。

如果在保持时间内未收到 hello 数据包，则 DUAL 必须重新计算拓扑。

报告距离是邻居通告的与目的地之间的距离。

EIGRP 在拓扑表中包含全面的网络拓扑信息，并在每次更新中与邻居路由器交换全部的路由信息。