思科第2学期第5章答案
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。
思科网院D4考试题 第五章 答案
1 执行网络设计安全要求时应该遵循哪项准则？始终对所有业务需求使用通用的安全计划。
作为标准的做法，如果成本太高，则降低对用户的访问限制。
避免因提高网络性能而降低安全性。
尽可能使用 IDS 来保护用户免受垃圾邮件侵害。
标题描述最高分值1 correctness of response2 points for Option 30 points for any other option 2此试题参考以下领域的内容：CCNA Discovery: 计算机网络设计和支持5.1.5 安全性需求2 2960 交换机具有什么局限性，使其无法提供分布层所需的服务？它只能使用铜缆连接。
它不支持 QoS。
它不支持语音 VLAN 功能。
它不支持路由总结。
标题描述最高分值1 correctness of response2 points for Option 40 points for any other option 2此试题参考以下领域的内容：CCNA Discovery: 计算机网络设计和支持5.2.2 设计分布层拓朴3 当考虑融合网络设计时，必须确定相应的服务需求。
当准备适用于此环境的网络设计时，需要考虑下列哪项因素？根据对噪音的敏感度进行业务数据补偿防火墙的位置和布置语音级服务质量安全策略要求标题描述最高分值1 correctness of response2 points for Option 30 points for any other option 2此试题参考以下领域的内容：CCNA Discovery: 计算机网络设计和支持5.1.4 网络性能需求4请参见图示。
在图中所示的两台交换机间连接两条链路有什么好处？可在一台交换机发生故障时提供冗余性当通向服务器的链路发生故障时提供通向 Switch1 的连接在交换机之间的一个连接发生故障时提供连通性在另一台交换机失去交流电源时为其供电标题描述最高分值1 correctness of response2 points for Option 30 points for any other option 2此试题参考以下领域的内容：CCNA Discovery: 计算机网络设计和支持5.1.3 可用性需求5 哪三项设计要求在接入层实施？（选择三项。
ccna2答案第五章
第五章 RIPv1 CCNA2 Exploration: 路由协议和概念 (2010-12-15 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Rou 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。
该网络包含多台路由器。
思科网络第二学期Final考试及答案
思科网络第二学期Final考试及答案思科网络第二学期Final考试及答案1.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。
2.请参见图示。
R1会使用哪一总结地址来向 R2通告其网络？192.168.0.0/223.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 0.0.0.0 0.0.0.0 Fa0/1ip route 0.0.0.0 0.0.0.0 10.1.1.24.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 172.16.1.1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 192.168.1.0/24的条目。
R1的路由表中缺少 192.168.2.0/24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。
（最新）思科网络第一学期1-5章中文测试题及答案
ENetwork Chapter 2 - CCNA Exploration: 网络基础知识(版本 4.0) 1在封装过程中，数据链路层执行什么操作？不添加地址。
添加逻辑地址。
添加物理地址。
添加进程的端口号。
2TCP/IP 网络接入层有何作用？路径确定和数据包交换数据表、编码和控制可靠性、流量控制和错误检测详细规定构成物理链路的组件及其接入方法将数据段划分为数据包3数据链路层封装添加的报尾信息有何主要功能？支持差错校验确保数据按照顺序到达确保送达正确目的标识本地网络中的设备帮助中间设备进行处理和路径选择4请参见图。
下列哪组设备仅包含终端设备？A、C、DB、E、G、HC、D、G、H、I、JD、E、F、H、I、JE、F、H、I J5OSI 模型各层从最高层到最低层的正确顺序如何？物理层、网络层、应用层、数据链路层、表示层、会话层、传输层应用层、物理层、会话层、传输层网络层、数据链路层、表示层应用层、表示层、物理层、会话层、数据链路层、传输层、网络层应用层、表示层、会话层、传输层、网络层、数据链路层、物理层表示层、数据链路层、会话层、传输层、网络层、物理层、应用层6下列哪三项陈述是对局域网(LAN) 最准确的描述？（选择三项）LAN 通常位于一个地域内。
此类网络由由一个组织管理。
LAN 中的不同网段之间一般通过租用连接的方式连接。
此类网络的安全和访问控制由服务提供商控制。
LAN 为同一个组织内的用户提供网络服务和应用程序访问。
此类网络的每个终端通常都连接到电信服务提供商(TSP)。
7第4 层端口指定的主要作用是什么？标识本地介质中的设备标识源设备和目的设备之间的跳数向中间设备标识过该网络的最佳路径标识正在通信的源终端设备和目的终端设备标识终端设备内正在通信的进程或服务8以下哪种特征正确代表了网络中的终端设备？管理数据流发送数据流重新定时和重新传输数据信号确定数据传输路径9请参见图示。
哪个术语正确判断出了包含于绿色区域中的设备类型？源终端传输中间10OSI 模型哪两层的功能与TCP/IP 模型的网络接入层相同？（选择两项）网络层传输层物理层数据链路层会话层11请参见图示。
思科 cisco 课后习题答案
分界点：
19． 调制解调器： 语音调制解调器将计算机生成的数字信号转换为可通过公共电话网络的模拟线路传输的语音 频率； 速度越快的调制解调器（如有线电视调制解调器和 DSL 调制解调器）在传输时使用的带宽频 率也越高。 CSU/DSU： 数字线路（如 T1 或 T3 线路）需要信道服务单元（CSU）和数据服务单元（DSU） ； 这两者经常合并到一台设备中，名为 CSU/DSU； CSU 端接数字信号， 并通过纠错和线路监视确保连接的完整性； DSU 在 T 载波线路帧和 LAN 能够解释的帧之间进行转换。 接入服务器： 集中处理拨入和拨出用户通信。接入服务器可同时有模拟和数字接口，能够同时支持数百名 用户。 WAN 交换机： 运营商网络中使用的多端口互连设备。这些设备通常交换帧中继、ATM 或 X.25 等数据流。 路由器： 提供用于连接服务提供商网络的网络互联接口和 WAN 接入接口。 这些接口可以是串行接口或其他 WAN 接口。有些类型的 WAN 接口需要通过 DSU/CSU 或调制 解调器（模拟、有线电视或 DSL）等外部设备将路由器连接到服务提供商。 20. X.25： 一种低带宽的老式 WAN 技术，最大速度为 48kbit/s，读卡器通常使用拨号模式 X.25 向中央 计算机验证事务； 对这些应用来说，低带宽和高延时并不是问题，而低成本让 X.25 成为众家之选； 很多服务提供商已使用帧中继代替 X.25。 一种第 2 层 WAN 协议，通常提供 4Mbit/s 或更高的数据速度； 使用虚电路提供永久、共享的中等带宽连接，可同时传输语音和数据； VC 由 DLCI 唯一标识，这确保两台 DTE 设备之间能够进行双向通信。 异步传输模式（ATM）技术是一种基于信元而不是帧的架构，使用 53 字节的定长信元； 这些小型定长信元非常适合传输对延迟敏感的语音和视频数据流。
大二思科考试题库和答案
大二思科考试题库和答案一、单项选择题（每题2分，共20分）1. 思科公司（Cisco）成立于哪一年？A. 1984年B. 1990年C. 1995年D. 2000年答案：A2. 以下哪个协议是用于在IP网络中传输数据的？A. HTTPB. FTPC. TCPD. IP答案：D3. 在OSI模型中，哪一层负责建立、维护和终止通信会话？A. 应用层B. 传输层C. 会话层D. 网络层答案：C4. 以下哪个设备不是网络交换机？A. Layer 2 SwitchB. Layer 3 SwitchC. RouterD. Hub答案：D5. 以下哪个命令用于在Cisco设备上显示当前配置？A. show running-configB. show startup-configC. show interfaceD. show ip interface brief答案：A6. 在Cisco设备上，哪个命令用于保存当前的配置到启动配置文件？A. copy running-config startup-configB. copy startup-config running-configC. save running-configD. write memory答案：A7. 以下哪个命令用于在Cisco设备上创建一个新的VLAN？A. vlan databaseB. configure terminalC. enableD. show vlan答案：A8. 以下哪个命令用于在Cisco设备上将接口配置为Trunk模式？A. switchport mode accessB. switchport mode dynamicC. switchport mode trunkD. switchport mode static答案：C9. 以下哪个协议用于在IP网络中自动分配IP地址？A. DHCPB. DNSC. FTPD. HTTP答案：A10. 在Cisco设备上，哪个命令用于查看设备的接口状态？A. show interfacesB. show ip interface briefC. show running-configD. show vlan答案：B二、多项选择题（每题3分，共15分）11. 以下哪些协议属于TCP/IP模型的应用层协议？A. HTTPB. FTPC. SNMPD. IP答案：A, B, C12. 在Cisco设备上，以下哪些命令用于配置接口？A. interfaceB. ip addressC. no shutdownD. enable答案：A, B, C13. 以下哪些设备可以作为网络的核心设备？A. SwitchB. RouterC. FirewallD. Hub答案：A, B14. 以下哪些命令用于在Cisco设备上查看网络信息？A. show ip routeB. show running-configC. show interfaceD. ping答案：A, C, D15. 以下哪些因素可以影响网络的性能？A. 带宽B. 延迟C. 丢包率D. 网络拓扑结构答案：A, B, C, D三、填空题（每题2分，共20分）16. 在Cisco设备上，使用________命令可以进入特权模式。
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1 请参见图示。
交换机为主机执行连接到VLAN 5 的路由。
如果 PC 从 Internet 访问 Web 服务器，那么在哪个点上会向该帧添加一个 VLAN 编号？点A 点B 点C 点D点E无 VLAN 编号添加到此设计中的帧。
答案 答案 最高分值correctness of response Option 622哪种类型的 VLAN 间通信设计需要配置多个子接口？单臂路由器通过多层交换机路由管理 VLAN 的路由传统 VLAN 间路由答案 答案 最高分值correctness of response Option 123使用单臂路由器 VLAN 间路由的缺点是什么？不支持 VLAN 标记的数据包比传统 VLAN 间路由要求使用更多的物理接口规模扩展不超过 50 个VLAN需要将配置的多个路由器接口用作接入链路答案 答案 最高分值correctness of response Option 324在多层交换机的多个 VLAN 之间，流量如何路由？流量通过物理接口路由。
流量通过内部 VLAN 接口路由。
流量从所有物理接口广播出去。
流量通过子接口路由。
答案 答案 最高分值correctness of response Option 225 规模较小的大学的教室网络使用 VLAN 10，办公室网络使用 VLAN 20。
在使用传统 VLAN 间路由时，需要使用什么来启用这两个 VLAN 之间的通信？应使用至少有两个 LAN 接口的路由器。
需要两组交换机，每个端口配置一个 VLAN 。
需要有一个 VLAN 接口的路由器连接到交换机的 SVI 。
需要将配置为中继的有一个端口的交换机连接到一个路由器上。
答案 答案 最高分值correctness of response Option 126下列哪种说法正确描述了使用路由器子接口进行 VLAN 间路由的缺点？比起使用单个路由器接口，费用更为昂贵。
在单个路由器接口上，路由流量必须争用带宽。
中继不能用于将路由器连接到交换机。
所有无标记流量都将被丢弃。
答案 答案 最高分值correctness of response Option 227请参见图示。
网络管理员需要为所示的网络配置单臂路由器。
如果显示的每个 VLAN 都需要路由，并且每个 VLAN 都有自己的子接口，那么应在路由器上创建 多少个子接口？12345答案 答案 最高分值correctness of response Option 428请参见图示。
网络管理员已使用上述命令配置了路由器 CiscoVille ，从而提供 VLAN 间路由。
连接到路由器 CiscoVille 的 Gi0/0 接口的交换机上需要哪条命 令，才能允许 VLAN 间路由？switchport mode accessno switchportswitchport mode trunkswitchport mode dynamic desirable答案 答案 最高分值correctness of response Option 329请参见图示。
路由器 RA 收到一个数据包，其源地址为 192.168.1.35， 目的地址为 192.168.1.85。
路由器会如何处理此数据包？路由器将丢弃该数据包。
路由器会将该数据包从接口 FastEthernet 0/1.1 转发出去。
路由器会将该数据包从接口 FastEthernet 0/1.2 转发出去。
路由器会将该数据包从接口 FastEthernet 0/1.3 转发出去。
路由器会将该数据包从接口 FastEthernet 0/1.2 和接口 FastEthernet 0/1.3 转发出去。
答案答案最高分值correctness of responseOption 3210请参见图示。
VLAN 之间没有通信。
可能是什么问题？路由器上使用了错误的端口。
Gi1/1 交换机端口不处于中继模式。
交换机和路由器之间都存在双工问题。
默认网关没有针对每个 VLAN 进行配置。
答案答案最高分值correctness of response2 points for Option 20 points for any other option211学校特定大楼中没有发生 VLAN 间通信。
在实施单臂路由器设计方法时，网络管理员可以使用哪两条命令来验证路由器与第 2 层交换机之间的 VLAN 间通信正常运行？（请选择两项。
）从路由器上发出show ip route命令。
从路由器上发出show interfaces trunk命令。
从路由器上发出show interface interface 命令。
从交换机上，发出show vlans 命令。
从交换机上发出show interface trunk 命令。
从交换机上发出show interface interface 命令。
答案答案最高分值correctness of response Option 1 and Option 5 are correct.1 point for each correct option.0 points if more options are selected than required.212请参见图示。
网络管理员正在检验 VLAN 间路由的配置。
用户抱怨不同 VLAN 中的 PC 之间无法通信。
根据输出，交换机接口 Gi1/1 有哪两个配置错误？（请选择两项。
）Gi1/1 处于默认 VLAN 中。
语音 VLAN 未分配给 Gi1/1。
Gi1/1 配置为中继模式。
Gi1/1 打开了中继协商。
中继封装协议配置错误。
答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.213请参见图示。
网络管理员正在检验 VLAN 间路由的配置。
用户抱怨 PC2 不能与 PC1 通信。
根据输出，可能导致此问题的原因是什么？Gi0/0 未配置为中继端口。
interface GigabitEthernet0/0.5 命令输入有误。
Gi0/0 接口未配置 IP 地址。
子接口中没有输入 no shutdown 命令。
Encapsulation dot1Q 5 命令包含错误的 VLAN 。
答案 答案 最高分值correctness of response Option 5214请参见图示。
在尝试输入路由器 RTA 中显示的配置后，管理员收到一个错误报告，而且VLAN 20 的用户报告说他们无法联系到 VLAN 30 的用户。
原因是什么？Dot1q 不支持子接口。
Fa0/0 上没有用作默认网关的地址。
RTA 为 VLAN 20 和 VLAN 30 使用相同的子网。
Fa0/0.20 和 Fa0/0.30 中应该已经发出了 no shutdown 命令。
答案 答案 最高分值correctness of response Option 3215请参见图示。
根据 show running-config 命令输出，为 VLAN 15、30 和45 实施单臂路由器配置。
使用 172.16.45.0 /24 网络的 VLAN45 上的 PC 无法连接 172.16.30.0 /24 网络中 VLAN 30 上的 PC 。
哪种错误可能导致此问题？在 GigabitEthernet 0/0.45 上配置了错误的 VLANGigabitEthernet 0/0.30 上缺少 no shutdown 命令GigabitEthernet 0/0 接口缺少 IP 地址。
在 GigabitEthernet 0/0.30 上配置了错误的 IP 地址。
答案 答案 最高分值correctness of response Option 4216请参见图示。
网络管理员正在配置 RT1 进行 VLAN 间路由。
交换机正确配置并可 正常工作。
主机 1、主机 2 和主机 3 无法互相通信。
根据路由器配置，导致此 问题的原因什么？Fa0/0 接口缺少 IP 地址配置信息。
子接口的 IP 地址与 VLAN 匹配不正确。
Fa0/0 的每个子接口需要单独的 no shutdown 命令。
路由器不支持在子接口上进行 802.1Q 封装。
答案 答案 最高分值correctness of response Option 2217需要什么条件才能进行第 3 层交换？第 3 层交换机必须启用 IP 路由。
参与的所有交换机必须具有唯一的 VLAN 编号。
路由的所有子网必须处于同一个 VLAN 中。
第 3 层交换的 VLAN 间路由必须使用单臂路由器。
答案 答案 最高分值correctness of response Option 1218请参见图示。
管理员可以发出哪条命令来将 VLAN10 状态更改为最新？Switch1(config)# interface vlan 10 Switch1(config-if)# no shutdownSwitch1(config)# interface vlan 10 Switch1(config-if)# ip address 192.168.10.1 255.255.255.0Switch1(config)# interface vlan 10 Switch1(config-if)# ip address 192.168.10.1 255.255.255.0 Switch1(config-if)# no shutdownSwitch1(config)# vlan 10 Switch1(config-vlan)# exit答案 答案 最高分值答案 答案 最高分值correctness of response Option 4219在多层交换机上配置 VLAN 间路由时，网络管理员在连接到另一台交换机的接口上发出 no sw令。
此命令的用途是什么？为单一网络创建一个路由端口提供静态中继链路 创建交换虚拟接口提供标记 VLAN 流量的接入链路答案 答案 最高分值correctness of response Option 1220为 VLAN 间路由使用多层交换机的缺点是什么？多层交换机对第 3 层路由有更高的延迟。
多层交换机比单臂路由器的实施更昂贵。
必须禁用生成树以在多层交换机上实施路由。
将多层交换机限制为对第 3 层路由使用中继链路。
答案 答案 最高分值correctness of response Option 2221使用缩写填空。
在多层交换机上配置 VLAN 间路由时，用作虚拟路由 VLAN 接口。
正确答案： svi22 填空题。
请勿使用缩写。
网络工程师正在对网络上新的 VLAN 配置进行故障排除。