思科第二学期第七章答案

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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 cisco 课后习题答案

在网络园区中接入层通常由lan交换设备组成这些设备的端口可用于连接工作站和服在wan环境中接入层让远程工作人员或远程站点能够使用wan技术访问公司网络
附录
检查你的理解和较难的问题和练习答案
第1章
检查你的理解
1．B、C、E 以太网交换机和转发器通常用于 LAN 中。路由器可视为 LAN 设备和 WAN 设备，用于在公司网络内部路由分组、将分组路由到 ISP 以及在自主系统之间路由分组。接入服务器集中拨入和拨出的用户通信，它可能有模拟和数字接口，可支持数百名用户同时连接到提供商的 WAN。 2．D 3．电路交换：D 分组交换：C 面向连接的分组交换：B 无连接的分组交换：A 4．城域以太网：A X.25：D ATM：B 帧中继：C 5．C DTE 通过 WAN 传输来自客户网络或主机计算机的数据。DTE 通过 DCE 连接到本地环路。路由器是一种 DTE 设备，它使用 CSU/DSU（DCE 设备）连接到 WAN。 6．E 租用线是一种专用的点到点链路，通常是向运营商租用的。 7．DLCI 唯一地标识了帧中继虚电路，这确保 DTE 设备之间能够进行双向通信。 8．异步传输模式（ATM）技术可通过私有和公共网络传输语音、视频和数据，它是建立在基于信元的架构而不是基于帧的架构的基础之上的。 9．C 10．B 11．C 12．E 13．C 14．C 15．C Cisco 企业分支机构架构让能够将园区网中的应用程序和服务延伸到各种远程位置和用户，接入层用于将用户连接到网络，这层通常使用第 2 层和第 3 层交换机。在北美，ISDN PRI 包含 23 个 64kbit/s 的 B 信道和 1 个 64kbit/s 的 D 信道，总比特率高 VPN 使用隧道通过公共网络（如 Internet）在两个私有网络之间安全地传输数据。分布层将工作组放在不同的网段中，从而隔离子网或 VLAN 中的网络问题。VLAN 之间本地环路将用户驻地的 CPE 连接到服务提供商的 CO，有时也被称为“最后一公里” 。企业远程工作人员架构让雇员能够远程（通常是从家里）连接到网络。而不管其规模和位置如何。核心层也称为网络主干，设计用于尽可能快地交换分组。

思科模拟试题及答案

思科模拟试题及答案一、选择题1. 以下哪个命令用于查看路由器的接口状态？A. show interfaceB. show ip interfaceC. show running-configD. show ip route答案：A2. 在思科路由器上配置默认网关的命令是什么？A. ip default-gatewayB. default gatewayC. ip route 0.0.0.0D. route 0.0.0.0答案：C3. 以下哪个协议用于在大型网络中自动发现路由？A. RIPB. OSPFC. BGPD. EIGRP答案：B4. 以下哪个命令用于查看当前路由器的配置？A. show running-configB. show startup-configC. show interfaceD. show ip route答案：A5. 以下哪个命令用于在路由器上配置静态路由？A. ip routeB. routeC. static routeD. configure static route答案：A二、填空题6. 思科的网络操作系统称为________。

答案：IOS7. 在思科设备上，使用________命令可以进入特权模式。

答案：enable8. 配置VLAN的命令是________。

答案：VLAN configuration mode9. 动态主机配置协议的缩写是________。

答案：DHCP10. 用于测试网络连通性的命令是________。

答案：ping三、简答题11. 简述什么是子网掩码，并说明其作用。

答案：子网掩码是一种用于区分IP地址中网络部分和主机部分的位模式。

它的作用是告诉路由器或交换机，IP地址的哪部分是网络地址，哪部分是主机地址，以便正确地进行路由和数据传输。

12. 描述什么是VLAN，以及它在网络中的作用。

答案：VLAN（虚拟局域网）是一种将局域网划分为多个虚拟网络的技术。

思科ITE章考试原题及答案图文稿

思科ITE章考试原题及答案图文稿思科I T E章考试原题及答案集团文件版本号：（M928-T898-M248-WU2669-I2896-DQ586-M1988）清洁计算机内部可以减少以下哪种负面环境因素？灰尘在清洁计算机机箱内部时，直接喷射压缩空气容易损坏下列哪种组件？风扇在生产车间，一个家具工厂用笔记本电脑来实现进程监控和报告。

生产车间的环境温度大约为27 摄氏度（80 华氏度）。

湿度相当高，大约为70%。

风扇安装在通风口顶部。

这里的木屑灰尘非常多。

以下哪个条件最可能对在这一环境中使用的笔记本电脑产生不利影响？灰尘蔬菜罐头工厂使用笔记本电脑来监控生产线。

生产环境的环境温度大约是 24 摄氏度（75 华氏度）。

湿度约为 30%。

由于装罐设备的使用，因此噪音很高。

笔记本电脑放在一个木箱中，木箱三面距离笔记本电脑较近。

以下哪个因素最可能对在这一环境中使用的笔记本电脑产生不利影响？放置笔记本电脑的木箱科考队正在用笔记本电脑工作。

科学家们工作地点的温度范围为 -13 华氏度（-25 摄氏度）到 80 华氏度（27 摄氏度）。

湿度约为 40%。

噪声水平较低，但地形崎岖，风速可达每小时 45 英里（每小时 72 公里）。

在需要时，科学家们会停下脚步，用笔记本电脑输入数据。

下列哪一项条件最有可能对于在此环境下使用的笔记本电脑造成负面影响？温度以下哪一项是制定预防性维护计划的一部分？记录每项维护任务的详细信息和频率技术人员正在施工现场执行 PC 硬件维护。

作为预防性维护计划的一部分，技术人员应该执行什么任务？进气风扇除尘。

以下哪项任务应作为硬件维护例行程序的一部分？检查并固定任何松动的电缆。

在测试导致某个问题的若干可能原因时，应该首先测试哪类原因？最容易最明显的原因在解决计算机问题时可以使用下列哪两项物品来帮助制定行动计划（选择两项。

）计算机手册计算机维修历史记录日志为客户排除计算机故障之前应该备份哪两类数据（选择两项。

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。

软件工程第七章测验测验答案慕课答案 UOOC优课课后练习深圳大学

第七章测验一、单项选择题(共40.00分) L面向对象的动态模型中，每张状态图表示()的动态行为。

A.某一个类
B.有关联的假设干类
C.一系列事件
D.一系列状态
正确答案：A
2.以下哪项不是类间关系？()
A.关联
B.继承
C.实现
D.通信
正确答案：D
3.在建立动态模型的过程中，脚本是指系统在某一执行期间内出现的一系列()o
A.事件
B.消息
C.动作
D.对象
正确答案：A
4.大多数分析模型都不是一次完成的，必须进行()o
A,屡次回溯
B.屡次迭代
C.屡次评审
D.屡次废弃
正确答案：B二、多项选择题(共33.00分)
1.组成复杂问题(大型系统)对象模型的5个层次包括()o
A.结构层
B.说明层
C.服务层
D.主题层
正确答案：A C D
2.需求陈述的内容包括()o
A.问题范围
B.功能需求
C.性能需求
D.应用环境及假设条件
正确答案：A B C D
3.以下哪些工具可用于描述面向对象动态模型？()
A.UML类图
B.UML状态图
C.UML顺序图
D.UML活动图
正确答案：BCD三、判断题(共27,00分)
L顺序图描述对象之间的交互关系，重点描述对象间消息传递的时间顺序。

()
A.正确
B.错误正确答案：A
2.面向对象方法是以类作为最基本的元素，类是分析问题和解决问题的核心。

()A.正确
B.错误正确答案：B
3.关联既可以描述问题域的静态结构，又可以描述瞬时事件。

()A.正确
B.错误正确答案：B。

第七章访问控制列表练习题参考答案

《网络互联技术》练习题第七章：访问控制列表参考答案一、填空题1、_访问控制列表_是用于控制和过滤通过路由器的不同接口去往不同方向的信息流的一种机制。

2、访问控制列表主要分为_标准访问控制列表_和扩展访问控制列表。

3、访问控制列表最基本的功能是_数据包过滤_。

4、标准访问控制列表的列表号范围是_1-99_。

5、将 66 号列表应用到fastethernet 0/0接口的in方向上去，其命令是_ip access-group 66 in 。

5、定义 77 号列表，只禁止192.168.5.0网络的访问，其命令是_access-list 77 deny 192.168.5.0 0.0.0.255;access-list 77 permit any_。

6、基于时间的访问控制列表，定义时间范围的关键字主要有两个，它们是_absolute_和_periodic_。

二、选择题1、标准访问控制列表应被放置的最佳位置是在（ B ）。

A、越靠近数据包的源越好B、越靠近数据包的目的地越好C、无论放在什么位置都行D、入接口方向的任何位置2、标准访问控制列表的数字标识范围是（ B ）。

A、1-50B、1-99C、1-100D、1-1993、标准访问控制列表以（ B ）作为判别条件。

A、数据包的大小B、数据包的源地址C、数据包的端口号D、数据包的目的地址4、IP扩展访问列表的数字标示范围是多少? （ C ）。

A、0-99B、1-99C、100-199D、101-2005、下面哪个操作可以使访问控制列表真正生效：（ A ）。

A、将访问控制列表应用到接口上B、定义扩展访问控制列表C、定义多条访问控制列表的组合D、用access-list命令配置访问控制列表6、以下对思科系列路由器的访问列表设置规则描述不正确的是（ B ）。

A、一条访问列表可以有多条规则组成B、一个接口只可以应用一条访问列表C、对冲突规则判断的依据是：深度优先D、如果您定义一个访问列表而没有应用到指定接口上，思科路由器默认允许所有数据包通过该接口中。

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1.
请参见图示。

如果所有路由器都运行 RIP 第 2 版，为什么没有 /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 /30 网络
2.
请参见图示。

下列哪个路由器上的哪条命令可让 Router1 获知 /20 网络
Router1(config)#?ip classless
Router1(config-router)#?no passive-interface serial 0/1/1
Router2(config-router)#?version 2
Router2(config-router)#?neighbor 10.0.0.2
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
4.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
5.
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。

但是，两台路由器都无法从对方动态获知路由。

最可能的原因是什么
需要配置最后选用网关。

子网划分不受 RIPv1 支持。

VLSM 不受 RIPv1 支持。

其中一台路由器的串行接口需要时钟频率
6.
请参见图示。

下列哪条命令可让 Router2 获知 /28 网络
Router1(config)#?ip classless
Router1(config-router)#?network
Router1(config-router)#?no passive-interface serial 0/1/1
Router2(config-router)#?version 2
Router2(config-router)#?neighbor 10.0.0.2
7.
请参见图示。

所有路由器都运行 RIP 第 2 版。

JAX 被配置为仅通告 10.0.0.0/24 网络。

CHI 被配置为通告 /16 网络。

网络管理员输入如图所示的命令。

该网络中将会发生什么变化
由于水平分割的原因，JAX 路由器将忽略 /16 网络的更新。

CHI 将在其路由表中安装到 /16 网络的路由。

CHI 的路由表中将包含 /16 路由，但该路由旁边将标记 S。

ORL 路由器将对其路由更新中转发的所有网络应用子网掩码
8.
请参见图示。

技术人员需要添加一个新的环回接口以便测试路由运作情况和网络设计。

该技术人员在路由器上输入下列一组命令：
Sanford(config)#?interface loopback1
Sanford(config-if)#?ip address
为什么该路由器返回错误
该路由器不允许环回接口配置。

该掩码不能用于这个地址类。

在添加这个地址之前必须配置无类路由。

Loopback1 的网络地址与之前配置的接口地址重叠。

该路由器已经超出其路由表所能提供的最大路径数限制
9.RIPv2 的默认度量允许的最大网络直径为多少
15 跳
16 跳
100 跳
120 跳
255 跳
10.配置路由协议时使用?network?命令有哪两项作用（选择两项。

）
标识将包含在路由更新中的网络
标识网络中可以进行总结的主机地址
用于列出远程和本地网络的所有地址
确定要对路由更新应用的子网掩码
确定哪些接口可以发送和接收路由更新
11.
请参见图示。

从如图所示的输出中能得到什么结论
路由表被限制为只能有 2 条路由。

LAN 接口参与了路由过程。

已经从每个串行接口各发出一个更新并已收到 2 个更新。

此路由器上未配置?no auto-summary
12.网络管理员被告知公司的 IP 地址基础架构必须符合 RFC 1918。

管理员可以在该网络中使用 RFC 1918 规定的哪三个 IP 地
址范围（选择三项。

）
10.0.0.0/8
/8
/16
/12
/16
/27
13.
请参见图示。

所有路由器都运行 RIPv1。

如果在路由器 B 上配置了地址为 10.16.1.129/27 的环回接口，那么路由器 B 的路由表将发生什么变化
将添加到 10.16.1.0/27、/27 和 /27 网络的路由。

将添加到 10.16.1.128/27 网络的相连路由。

将添加来源为 RIPv1 的第三条到 10.0.0.0/8 网络的路由。

配置路由器 B 之后，路由表将立即删除 10.0.0.0/8 路由
14.网络管理员安装了四台运行 RIPv2 的新路由器。

Router1 是 RIPv2 网络中的边界路由器，其上配置了默认路由。

当网络收敛
后，网络管理员在 Router1 上输入 Router1(config-router)#?default-information originate。

该命令将对网络产生什么影响
阻止 Router1 转发有关非直连网络的更新
使网络中的所有路由器都与 Router1 同步路由更新
强制 Router1 成为更新的主要路由器或指定路由器 (DR)
向网络中的所有路由器传播默认路由
15.
请参见图示。

如图所示的网络中同时包含 Cisco 路由器和非 Cisco 路由器。

JAX 路由器上输入了命令?debug ip rip。

目前所有路由器都运行相同版本的 RIP。

路由器 CHI 和路由器 ORL 无法到达 /28 网络。

使用什么方法可能解决此问题
在网络中启用水平分割。

在路由器上配置 RIPv2。

在 JAX 路由器的 RIP 配置中添加网络。

将 JAX Fa0/0 配置为被动接口。

启用 JAX 路由器上的 Serial0/0/0 接口。

将 JAX 路由器 Fa0/0 接口的 IP 地址更改为 /24
16.为了支持 VLSM 和 CIDR，RFC 1723 在 RIP 消息报头中添加了什么字段
子网掩码
目的端口号
地址族标识符
源和目的 IP 地址
17.请参见图示。

如图所示的命令对 Router1 的 RIP 更新会产生什么影响
只有第 2 版更新会发送到。

只有第 2 版更新会发送到。

第 1 版和第 2 版更新都会发送到。

第 1 版和第 2 版更新都会发送到
18.
请参见图示。

RIPv1 是如图所示网络的路由协议。

在每台路由器上使用以下命令：
router rip
network 10.0.0.0
network
完成上述配置后，每台路由器的 LAN 上的用户都无法访问远程 LAN。

为什么
network 语句配置错误。

形成了路由环路。

RIPv1 无法路由至主网的不连续子网。

RIPv1 无法路由使用 /24 子网掩码的网络
19.网络中的路由器使用 RIPv2 作为路由协议。

已经在路由器上输入了命令 Router(config-router)#?no version 2。

输入该命
令对路由更新会产生什么影响
子网掩码将添加到路由更新中。

路由更新将通过组播地址发送出去。

将接收第 1 版和第 2 版更新，但不会发送第 2 版更新。

RIP 路由过程将从路由器上删除，不会再转发路由更新。