思科第2学期第4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. 。
思科练习题答案
思科练习题答案在本文中，我将为您提供思科练习题的答案。
这些答案旨在帮助您更好地理解和应用思科网络技术。
请一起来看看吧！第一题问题：什么是子网掩码？它的作用是什么？答案：子网掩码是一个32位长的二进制数字，用于确定一个IP地址中哪些位用于网络地址，以及哪些位用于主机地址。
它的作用是帮助划分IP地址，将一个大网络划分为多个小网络，以提高网络的安全性和效率。
第二题问题：请解释什么是VLAN？答案：VLAN（Virtual Local Area Network）是一种将网络设备按逻辑上的需求进行逻辑划分的技术。
通过VLAN，可以将不同的设备划分到不同的虚拟网络中，实现逻辑上的隔离和管理。
这样可以提高网络的可管理性和安全性。
第三题问题：请列举一些常见的网络设备。
答案：常见的网络设备包括路由器、交换机、网关、防火墙等。
路由器用于在不同网络之间进行数据转发和路由选择；交换机用于在局域网中转发数据包；网关用于连接不同类型的网络；防火墙用于保护网络免受恶意攻击。
第四题问题：请解释什么是IP地址？IP地址的分类有哪些？答案：IP地址（Internet Protocol Address）是互联网中用于标识设备的地址。
它由32位的二进制数字组成，通常表示为四个十进制数，每个数的取值范围为0-255。
IP地址的分类主要有A类、B类、C类、D类和E类。
其中，A类地址用于大型网络，B类地址用于中型网络，C类地址用于小型网络，D类地址用于多播，E类地址为保留地址。
第五题问题：请解释什么是动态主机配置协议（DHCP）？答案：动态主机配置协议（DHCP）是一种网络协议，用于自动分配IP地址给网络上的设备。
通过DHCP，设备可以在加入网络时自动获取一个可用的IP地址、子网掩码、网关等网络配置信息，从而实现网络的自动化配置和管理。
总结：通过本文，我们回答了几个与思科网络技术相关的练习题。
我们了解了子网掩码的作用，学习了VLAN的概念，认识到了常见的网络设备，了解了IP地址的分类以及动态主机配置协议（DHCP）的工作原理。
思科第二学期第四章练习
1当包含 VLAN 的交换网络中配置了 VTP 时，下列哪种说法正确？Option 4 VTP 仅与 802.1Q 标准兼容。
VTP 增大了管理交换网络的复杂性。
通过 VTP 可将交换机配置为多个 VTP 域的成员。
VTP 会向同一 VTP 域内的所有交换机动态通知 VLAN 更改情况。
2VTP 以客户端模式工作具有哪两项特点？（选择两项。
）Option 15无法添加 VLAN可添加在本地有效的 VLAN无论 VLAN 信息如何，将广播从所有端口转发出去只能传递 VLAN 管理信息而无法接受更改可向同一 VTP 域中的其它交换机转发 VLAN 信息3请参见图示。
交换机 S1 处于 VTP 服务器模式。
交换机 S2 和 S3 处于客户端模式。
管理员意外断开了 S2 的 F0/1 接口上的电缆。
这会对 S2 产生什么后果？Option3S2 会自动转换到 VTP 透明模式。
S2 会将所有 VLAN 从 VLAN 数据库中删除，直到重新接好电缆为止。
S2 会保存已知的最新修订版本的 VLAN ，但如果它重新加载，就会丢失这些VLAN。
当电缆重新接好时，S2 会自动向 172.17.99.11 发送一个 VTP 通告请求。
4下列关于实施 VTP 的说法中哪两项正确？（选择两项。
）Option12交换机必须通过中继链路来连接。
VTP 域名区分大小写。
透明模式下的交换机不能配置新 VLAN。
必须使用 VTP 口令且区分大小写。
使用 VTP 的交换机必须具有相同的交换机名称。
5请参见图示。
VTP 域内的所有交换机均是新的。
交换机 SW1 被配置为 VTP 服务器，交换机 SW2 和 SW4 被配置为 VTP 客户端，交换机 SW3 被配置为 VTP 透明模式。
哪台或哪些交换机会收到 VTP 更新并根据更新来同步 VLAN 配置？Option 4所有交换机均会收到更新并同步 VLAN 信息。
仅交换机 SW2 会收到更新并同步 VLAN 信息。
(完整版)思科ite6.0第四章考试答案
第四章考试答案1. 而消极的环境因素清理电脑内减少吗?•灰尘•EMI•生锈•防静电2. 哪个组件可以很容易地受到的直接喷射压缩空气清理电脑机箱内部的什么时候?•风扇•散热器•电力供应•CPU•电缆连接器3. 在生产地板,家具工厂笔记本电脑过程监测和报告。
生产楼环境是80华氏度(27摄氏度)左右。
湿度水平相当高70%左右。
空气循环风扇安装在天花板上。
木粉是普遍的。
这条件是最有可能影响在这种环境下使用的一台笔记本电脑吗?•温度•湿度•空气流•尘埃4. 蔬菜罐头工厂生产线使用笔记本电脑的监控。
生产环境有一个环境温度在华氏75度(摄氏24度)。
湿度水平约为30%。
噪音水平很高,由于灌装机械。
笔记本电脑是一个木制的盒子里,紧紧围绕着笔记本电脑三面。
哪个因素最可能影响在这种环境下使用的一台笔记本电脑吗?•房间的温度•湿度•噪音•笔记本电脑的容器5. 科学探险团队使用笔记本电脑。
科学家们正在研究的温度范围从-13华氏度(-25摄氏度)到80华氏度(27摄氏度)。
湿度水平约为40%。
噪音水平很低,但地形是粗糙和时速可以达到45英里(每小时72公里)。
在需要的时候,科学家们停止行走,使用笔记本电脑输入数据。
这条件是最有可能影响在这种环境下使用的一台笔记本电脑吗?•温度•湿度•粗糙的地形•风6. 创建一个预防性维护计划的一部分是什么?•记录每个维护任务的细节和频率•执行硬件升级•丢弃所有取代部分•执行一个法医审计的安全漏洞7. 电脑的技术员执行硬件维护在一个建筑工地。
什么任务应该技术员执行预防性维护计划的一部分?•把灰尘从摄入的粉丝。
•备份数据,格式化硬盘,重新安装数据。
•开发和安装法医跟踪软件。
•执行审计的所有软件安装。
8. 哪个任务应该是硬件维护程序的一部分吗?•审查安全更新。
•更新病毒定义文件。
•调整显示器的最佳分辨率。
•从硬盘中除尘。
•检查并确保任何松散的电缆。
9. 在测试的过程中几个可能的原因的理论问题,应该先测试吗?•最简单和最明显的•那些客户认为是最重要的•最复杂的,难以诊断•随机选择的选择10. 这两个项目可以用来帮助建立一个行动计划解决电脑问题?(选择两个。
思科 cisco 课后习题答案
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。
CCNA第二学期路由协议和概念chapter3答案
下列哪两项正确描述了管理距离与度量的概念？（选择两项。
）管理距离是指特定路由的可信度。
路由器会首先添加具有较大管理距离的路由。
网络管理员无法更改管理距离的值。
具有到目的地的最小度量的路由即为最佳路径。
度量总是根据跳数确定。
度量会根据所采用的第 3 层协议（如 IP 或 IPX）而发生变化。
Option 1 and Option 4 are correct.请参见图示。
下列关于 R1 如何确定与 R2 之间最佳路径的陈述中，哪一项正确？R1 会将使用网络 A 的 RIP 路由加入路由表，因为 RIP 的管理距离比 EIGRP 大。
R1 会将使用网络 A 的 RIP 路由加入路由表，因为 RIP 的路径开销比 EIGRP 低。
R1 会将使用网络 B 的 EIGRP 路由加入路由表，因为 EIGRP 的管理距离比 RIP 小。
R1 会将使用网络 B 的 EIGRP 路由加入路由表，因为 EIGRP 的路径开销比 RIP 低。
R1 会将 EIGRP 路由和 RIP 路由加入路由表，并在它们之间实施负载均衡。
2 points for Option 3下列关于无类路由协议的陈述，哪两项是正确的？（选择两项。
）在路由更新中发送子网掩码信息将完整的路由表更新发送给所有邻居受 RIP 第 1 版支持允许在同一拓扑结构中同时使用 192.168.1.0/30 和192.168.1.16/28 子网减少组织中可用地址空间的大小Option 1 and Option 4 are correct.网络管理员可使用下列哪一条命令来确定路由器是否启用了负载均衡？show ip protocolsshow ip routeshow ip interface briefshow ip interface2 points for Option 2存在下列哪两个条件时，使用距离矢量路由协议会比较有效？（选择两项。
）网络需要特殊的分层式设计网络必须能快速收敛网络使用的是集中星型拓扑结构网络使用的是平面设计相距最远的路由器之间超过 15 跳Option 3 and Option 4 are correct.路由协议有何作用？用于构建和维护 ARP 表。
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。
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。
第四章思科 高级网络互联(英文版答案)
1.Refer to the exhibit. Which switching technology would allow each access layerswitch link to be aggregated to provide more bandwidth between each Layer 2switch and the Layer 3 switch?CCNA3 v6.0 Chapter 4 Exam 007o HSRPo PortFasto trunkingo EtherChannelExplanation:PortFast is used to reduce the amount of time that a port spends going through the spanning-tree algorithm, so that devices can start sending data sooner. Trunking can be implemented in conjunction with EtherChannel, but trunking alone does not aggregate switch links. HSRP is used to load-balance traffic across two different connections to Layer 3 devices for default gateway redundancy. HSRP does not aggregate links at either Layer 2 or Layer 3 as EtherChannel does.2.Which statement is true regarding the use of PAgP to create EtherChannels?o It requires full duplex.o It is Cisco proprietary.o It requires more physical links than LACP does.o It increases the number of ports that are participating in spanning tree.o It mandates that an even number of ports (2, 4, 6, etc.) be used foraggregation.Explanation:PAgP is used to automatically aggregate multiple ports into an EtherChannel bundle, but it only works between Cisco devices. LACP can be used for the same purpose between Cisco and non-Cisco devices. PAgP must have the same duplex mode at both ends and can use two ports or more. The number of ports depends on the switch platform or module. An EtherChannel aggregated link is seen as one port by the spanning-tree algorithm.3.Which two protocols are used to implement EtherChannel? (Choose two.)o Spanning Tree Protocolo Rapid Spanning Tree Protocolo Port Aggregation Protocolo Link Aggregation Control Protocolo Cisco Discovery ProtocolExplanation:Port Aggregation Protocol and Link Aggregation Control Protocol are used to implementEtherChannel. Spanning Tree and Rapid Spanning Tree Protocol are used to prevent switching loops.Cisco Discovery Protocol is Cisco-proprietary and is used to discovery information about adjacent Cisco devices such as model number and IP address.4.Which statement describes a characteristic of EtherChannel?o It can combine up to a maximum of 4 physical links.o It can bundle mixed types of 100 Mb/s and 1Gb/s Ethernet links.o It consists of multiple parallel links between a switch and a router.o It is made by combining multiple physical links that are seen as one linkbetween two switches.Explanation:An EtherChannel is formed by combining multiple (same type) Ethernet physical links so they are seen and configured as one logical link. It provides an aggregated link between two switches.Currently each EtherChannel can consist of up to eight compatibly configured Ethernet ports.5.Which statement describes an EtherChannel implementation?o EtherChannel operates only at Layer 2.o PAgP cannot be used in conjunction with EtherChannel.o A trunked port can be part of an EtherChannel bundle.o EtherChannel can support up to a maximum of ten separate links.Explanation:Up to 16 links can be grouped in an EtherChannel by using the the PAgP or LACP protocol.EtherChannel can be configured as a Layer 2 bundle or a Layer 3 bundle. Configuring a Layer 3 bundle is beyond the scope of this course. If a trunked port is a part of the EtherChannel bundle, all ports in the bundle need to be trunk ports and the native VLAN must be the same on all of these ports. A best practice is to apply the configuration to the port channel interface. The configuration is then automatically applied to the individual ports.6.An EtherChannel link using LACP was formed between two switches, S1 and S2.While verifying the configuration, which mode combination could be utilized onboth switches?o S1-on and S2-passiveo S1-passive and S2-passiveo S1-on and S2-activeo S1-passive and S2-activeExplanation:An EtherChannel link will be formed using LACP when both switches are in on mode or in active mode, or when one of them is in passive mode and the other is in active mode.7.What is an advantage of using LACP?o increases redundancy to Layer 3 deviceso decreases the chance of a spanning-tree loopo allows automatic formation of EtherChannel linkso provides a simulated environment for testing link aggregationo decreases the amount of configuration that is needed on a switch forEtherChannel8.What is a best practice to use before beginning an EtherChannel implementation?o Assign affected interfaces to VLAN 1.o Assign affected interfaces to the management VLAN.o Shut down each of the affected interfaces.o Enable each of the affected interfaces.o Assign affected interfaces to an unused VLAN.Explanation:Before configuring EtherChannel, the interfaces used should be shut down so that any incomplete configuration will not cause activity on the link.9.Which PAgP mode combination will establish an EtherChannel?o switch 1 set to on; switch 2 set to desirable.o switch 1 set to desirable; switch 2 set to desirable.o switch 1 set to auto; switch 2 set to auto.o switch 1 set to auto; switch 2 set to on.Explanation:Switch 1 and switch 2 will establish an EtherChannel if both sides are set to desirable as both sides will negotiate the link. A channel can also be established if both sides are set to on, or if one side is set to auto and the other to desirable. Setting one switch to on will prevent that switch fromnegotiating the formation of an EtherChannel bundle.10.Which three options must match in order to establish an EtherChannel betweentwo directly connected switches? (Choose three.)o port numbers that are used for the EtherChannelo VLAN memberships of the interfaces that are used for EtherChannelo domain names on the switcheso speed of the interfaces that are used for EtherChannelo duplex settings of the interfaces that are used for EtherChannelo port security settings on the interfaces that used for EtherChannelExplanation:Speed and duplex settings must match for all interfaces in an EtherChannel. All interfaces in the EtherChannel must be in the same VLAN if the ports are not configured as trunks. Any ports may be used to establish an EtherChannel. Domain names and port security settings are not relevant to EtherChannel.11.A network administrator is configuring an EtherChannel link between switchesSW1 and SW2 by using the command SW1(config-if-range)# channel-group 1mode passive. Which command must be used on SW2 to enable thisEtherChannel?o SW2(config-if-range)# channel-group 1 mode autoo SW2(config-if-range)# channel-group 1 mode activeo SW2(config-if-range)# channel-group 1 mode passiveo SW2(config-if-range)# channel-group 1 mode desirableExplanation:The possible combinations to establish an EtherChannel between SW1 and SW2 using LACP or PAgP are as follows:PAgPon onauto desirabledesirable desirableLACPon onactive activepassive activeThe EtherChannel mode chosen on each side of the EtherChannel must be compatible in order to enable it.12.Refer to the exhibit. An EtherChannel was configured between switches S1 andS2, but the interfaces do not form an EtherChannel. What is the problem?CCNA3 v6.0 Chapter 4 Exam 008o The interface port-channel number has to be different on each switch.o The switch ports were not configured with speed and duplex mode.o The switch ports have to be configured as access ports with each porthaving a VLAN assigned.o The EtherChannel was not configured with the same allowed range ofVLANs on each interface.Explanation:The guidelines for configuring an EtherChannel link are:5.Interfaces which form an EtherChannel can be physically discontiguous, and on different modules.6.Interfaces in an EtherChannel have to operate at the same speed and in the same duplex mode.7.Interfaces in the EtherChannel must be assigned to the same VLAN, or be configured as a trunk.8.Interfaces in the EtherChannel have to support the same allowed range of VLANs.13.Refer to the exhibit. A network administrator has decided that an EtherChannelbetween ports 0/1 and 0/2 on switches S1 and S2 would help performance. Aftermaking the configuration, the administrator notices no performance gain. Basedon the output that is shown, what two possible assumptions could a networkadministrator make? (Choose two.)CCNA3 v6.0 Chapter 4 Exam 006o The EtherChannel bundle is working.o The EtherChannel bundle is not working.o One of the ports on S2 was not configured correctly.o Switch S2 did not use a compatible EtherChannel mode.o LACP and PAgP were both used to form the EtherChannel.o Switch S2 must be configured so that the maximum number of portchannels is increased.Explanation:In order to form an EtherChannel, all ports should be within the same group.14.Refer to the exhibit. A network administrator issued the show etherchannelsummary command on the switch S1. What conclusion can be drawn?CCNA3 v6.0 Chapter 4 Exam 005o The EtherChannel is suspended.o The EtherChannel is not functional.o The port aggregation protocol PAgP is misconfigured.o FastEthernet ports Fa0/1, Fa0/2, and Fa0/3 do not join the EtherChannel.Explanation:The EtherChannel status shows as (SD), which means it is a Layer 2 EtherChannel with a status of D or down. Because the EtherChannel is down, the status of the interfaces in the channel group is stand-alone. PAgP is configured on S1, but there is no indication whether it is configured correctly on S1.The problem might also be the adjacent switch EtherChannel configuration.15.Refer to the exhibit. Based on the command output shown, what is the status ofthe EtherChannel?CCNA3 v6.0 Chapter 4 Exam 002o The EtherChannel is dynamic and is using ports Fa0/10 and Fa0/11 aspassive ports.o The EtherChannel is down as evidenced by the protocol field beingempty.o The EtherChannel is partially functional as indicated by the P flags forthe FastEthernet ports.o The EtherChannel is in use and functional as indicated by the SU and Pflags in the command output.Explanation:The command output shows the port channel as SU, which means Layer 2 and in use; and theFastEthernet 0/10 and 0/11 interfaces are bundled in port-channel as indicated by the P flag.Configuring the EtherChannel using the channel-group 1 mode on command will cause the Protocol field in the command output to be empty.16.What is a requirement to configure a trunking EtherChannel between twoswitches?o The participating interfaces must be physically contiguous on a switch.o The allowed range of VLANs must be the same on both switches.o The participating interfaces must be on the same module on a switch.o The participating interfaces must be assigned the same VLAN numberon both switches.Explanation:To enable a trunking EtherChannel successfully, the range of VLANs allowed on all the interfaces must match; otherwise, the EtherChannel cannot be formed. The interfaces involved in anEtherChannel do not have to be physically contiguous, or on the same module. Because theEtherChannel is a trunking one, participating interfaces are configured as trunk mode, not access mode.17.What is the purpose of HSRP?o It provides a continuous network connection when a router fails.o It prevents a rogue switch from becoming the STP root.o It enables an access port to immediately transition to the forwarding state.o It prevents malicious hosts from connecting to trunk ports.Explanation:HSRP is a first hop redundancy protocol and allows hosts to use multiple gateways through the use ofa single virtual router.18.Which nonproprietary protocol provides router redundancy for a group ofrouters which support IPv4 LANs?o HSRPo VRRPv2o GLBPo SLBExplanation:The only nonproprietary FHRP used for router redundancy listed in the options is VRRPv2. HSRP and GLBP are both Cisco proprietary FHRPs. IOS SLB is a Cisco-based solution used to loadbalance traffic across multiple servers.19.Refer to the exhibit. A network administrator configured routers R1 and R2 aspart of HSRP group 1. After the routers have been reloaded, a user on Host1complained of lack of connectivity to the Internet The network administratorissued the show standby brief command on both routers to verify the HSRPoperations. In addition, the administrator observed the ARP table on Host1.Which entry should be seen in the ARP table on Host1 in order to gainconnectivity to the Internet?CCNA3 v6.0 Chapter 4 Exam 004o the IP address and the MAC address of R1o the virtual IP address and the virtual MAC address for the HSRP group 1o the virtual IP address of the HSRP group 1 and the MAC address of R1o the virtual IP address of the HSRP group 1 and the MAC address of R2 Explanation:Hosts will send an ARP request to the default gateway which is the virtual IP address. ARP replies from the HSRP routers contain the virtual MAC address. The host ARP tables will contain a mapping of the virtual IP to the virtual MAC.20.Refer to the exhibit. What statement is true about the output of the showstandby command?CCNA3 v6.0 Chapter 4 Exam 003o The current priority of this router is 120.o The router is currently forwarding packets.o This router is tracking two properly operating interfaces.o This router is in the HSRP down state because its tracked interfaces aredown.Explanation:The output shows that the active router is local and indicates that this router is the active router and is currently forwarding packets.21.Refer to the exhibit. A network engineer is troubleshooting host connectivity ona LAN that uses a first hop redundancy protocol. Which IPv4 gateway addressshould be configured on the host?CCNA3 v6.0 Chapter 4 Exam 001o 192.168.2.0o 192.168.2.1o 192.168.2.2o 192.168.2.100Explanation:The host default gateway address should be the FHRP (in this case GLBP) virtual IP address.22.A network administrator would like to ensure that router R1 is always electedthe active router for an HSRP group. Which set of commands would ensure therequired results?o R1(config-if)# ip address 192.168.1.100 255.255.255.0R1(config-if)# standby 1 ip 192.168.1.1R1(config-if)# standby 1 priority 1R1(config-if)# no shutdowno R1(config-if)# ip address 192.168.1.250 255.255.255.0R1(config-if)# standby 1 ip 192.168.1.1R1(config-if)# no shutdowno R1(config-if)# ip address 192.168.1.100 255.255.255.0R1(config-if)# standby 1 ip 192.168.1.1R1(config-if)# standby 1 priority 255R1(config-if)# standby 1 preemptR1(config-if)# no shutdowno R1(config-if)# ip address 192.168.1.100 255.255.255.0R1(config-if)# standby 1 ip 192.168.1.1R1(config-if)# standby 1 priority 150R1(config-if)# no shutdownExplanation:In order to configure HSRP, the standby command is used. The IP address given withthe standby command is the virtual IP address used by hosts as a default gateway. A priority number of 255 is the highest that can be assigned and should be configured on the router that is to be theactive router.Fill in the blank.In FHRP operation, two or more routers are represented as asingle virtual router.1.Open the PT Activity. Perform the tasks in the activity instructions and thenanswer the question.What are two reasons why the ping messages that are issued from Laptop0towards Laptop1 are failing? (Choose two.)o The channel group mode is not set correctly on the switches.o The wrong cable types are connecting the two switches.o The interface VLAN 1 is shut down on both switches.o The channel group should be configured as a trunk on each switch.o The two interfaces on each of the switches belong to different VLANs.Explanation:Port-channel 1 needs to be configured as a trunk in order to carry data about two different VLANs.The channel group is set as auto and desirable. The SVI has not been configured on the switches, but this does not affect the creation of an EtherChannel. The use of straight-through cables betweenswitches is not an issue when using a Cisco Catalyst 2960 switch.======================================================================================1 New Updated May 20181. In FHRP terminology, what represents a set of routers thatpresent the illusion of a single router to hosts?•standby router•virtual router•forwarding router•default gateway。
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。
思科期末考试题库和答案
思科期末考试题库和答案一、单选题1. 在思科网络技术中，OSI模型的第4层是什么？A. 传输层B. 会话层C. 表示层D. 应用层答案：A2. 以下哪个协议是用于在网络层进行路由选择的？A. TCPB. IPC. UDPD. FTP答案：B3. 动态主机配置协议（DHCP）工作在OSI模型的哪一层？A. 应用层B. 传输层C. 网络层D. 数据链路层答案：D4. 以下哪个命令用于在思科设备上查看当前配置？A. show running-configB. show startup-configC. show interface statusD. show ip route答案：A5. 在思科设备上，哪个命令用于保存当前的配置到启动配置中？A. copy running-config startup-configB. copy startup-config running-configC. saveD. write答案：A二、多选题6. 以下哪些是思科交换机上常用的端口类型？A. FastEthernetB. GigabitEthernetC. TenGigabitEthernetD. Serial答案：A, B, C, D7. 在思科设备上，以下哪些命令用于管理VLAN？A. vlan databaseB. enableC. configure terminalD. exit答案：A, C8. 以下哪些是思科路由器上常用的接口类型？A. FastEthernetB. GigabitEthernetC. SerialD. ATM答案：A, B, C, D9. 以下哪些是思科设备上用于查看网络状态的命令？A. show ip interface briefB. show running-configC. show interface statusD. ping答案：A, C, D10. 在思科设备上，以下哪些命令用于配置静态路由？A. ip routeB. ip routingC. routeD. configure terminal答案：A, D三、判断题11. 思科的IOS（Internetworking Operating System）是运行在所有思科设备上的软件。
思科答案CCNA4-7
1.请参见图示。
网络技术人员确定DHCP 客户端工作不正常。
客户端从作为DHCP 服务器的路由器上接收了IP 配置信息，但无法访问Internet。
根据图中所示的输出，问题最可能出在哪里？4 未启用HTTP 服务器服务。
未定义DCHP 的内部接口。
未将DHCP 地址池绑定到接口。
地址池中没有为客户端定义默认路由器。
DHCP 地址池中排除了所有主机地址。
2.请参见图示。
根据图中所示的配置，应该如何为网络中的关键主机（例如路由器接口、打印机和服务器）分配排除地址池？1地址由网络管理员静态分配。
DHCP 服务器动态分配地址。
地址必须先列在DHCP 地址池中，才能用于静态分配。
地址必须先列在DHCP 地址池中，才能用于动态分配。
3.请参见图示。
请参见图示。
根据图中所示的输出，此DHCP 服务器成功分配或更新了多少个地址？4167894.使用NAT 的两个好处是什么？（选择两项。
）12它可节省公有IP 地址。
它可增强网络的私密性和安全性。
它可增强路由性能。
它可降低路由问题故障排除的难度。
它可降低通过IPsec 实现隧道的复杂度。
5.有关NAT 与PAT 之间的差异，下列哪一项正确？4PAT 在访问列表语句的末尾使用"overload" 一词，共享单个注册地址。
静态NAT 可让一个非注册地址映射为多个注册地址。
动态NAT 可让主机在每次需要外部访问时接收相同的全局地址。
PAT 使用唯一的源端口号区分不同的转换。
6.网络管理员应该使用哪种NAT 来确保外部网络一直可访问内部网络中的web 服务器？2NAT 过载静态NAT静态NATPAT7.请参见图示。
哪个或哪些地址是内部全局地址？310.1.1.2192.168.0.100209.165.20.25网络10.1.1.0 中的任意地址8.请参见图示。
下列关于图中所示配置的说法中哪两项正确？（选择两项。
）13来自网络10.1.1.0 的流量将被转换。
思科答案CCNA4-8
1.逻辑网络图中一般含有哪两项信息？（选择两项。
）34电缆类型连接器类型接口标识符虚电路的DLCI操作系统版本2.广播流量过多一般表明哪一层出了问题？2物理层数据链路层网络层传输层3.下列哪项是物理层故障的例子？4封装不正确STP 配置不正确ARP 映射不正确时钟频率不正确4.当建立网络基线时必须考虑哪两项因素？（选择两项。
）15关于网络设计的信息网络中的IP 地址分配情况关于服务提供商设置的要求关于用于规范流量的访问控制列表的要求正常工作条件下的预期性能5.请参见图示。
在创建网络文档的过程中应该进行哪两个步骤？（选择两项。
）23记录仅在园区网络中发现的设备的相关信息。
记录在整个网络中（包括远程站点）发现的设备的相关信息。
将网络配置表中与拓扑图所示组件相关的任何设备信息记录下来。
仅将网络配置表中与拓扑图所示组件相关的第2 层和第3 层设备信息记录下来。
将网络配置表中与拓扑图所示组件相关的在网络使用高峰期收集的的设备信息记录下来。
6.下列关于逻辑网络模型的说法中哪两项正确？（选择两项。
）26TCP/IP 将OSI 模型的最低层划分为两个相互独立的层。
TCP/IP 模型的顶层综合了OSI 模型的上面三层的功能。
使用TCP/IP 模型进行故障排除所需的技术与使用OSI 模型时不同。
网络接入层负责在TCP/IP 网络中的设备之间交换数据包。
Internet 层负责在处于不同主机上的应用（例如FTP、HTTP 和SMTP）之间提供通信。
TCP/IP 网络接入层对应于OSI 物理层和数据链路层。
7.全公司的各个客户端报告数据中心内运行的所有企业应用程序性能均不良，而Internet 接入以及企业WAN 中运行的应用程序均工作正常。
网络管理员使用协议分析器观察到数据中心内应用程序服务器LAN 中持续存在随机无意义的流量广播(jabber)。
管理员应该如何开始故障排除过程？1 数据中心中的超时传输现象表明存在本地物理层问题。
思科 第二学期 答案 1-4章
第一章路由和数据包转发介绍1．哪两项说法正确描述了路由器的组件？（选择两项）（B、D）A．RAM 永久存储着在启动过程中使用的配置文件B．ROM 含有硬件模块所执行的诊断程序C．NVRAM 存储着在启动过程中使用的IOS 的备份副本D．重新启动时闪存中的内容不会丢失E．ROM 包含最新而且最完整的IOS 版本F．闪存包含用于标识IOS 位置的启动系统命令2．图中的哪些接口可用于租用线路WAN 连接？（选择两项）（A、D）A．1B．2C．3D．4E．5F．63．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？（B）A．启动过程将重置B．路由器将提示用户进行响应，以进入设置模式C．启动过程将停止，直到获得有效的配置文件D．路由器将根据上次的有效配置生成默认配置文件E．路由器将监控本地流量，以确定路由协议配置要求4．以下哪一项正确描述了路由器启动时的顺序？（A）A．加载bootstrap、加载IOS、应用配置B．加载bootstrap、应用配置、加载IOSC．加载IOS、加载bootstrap、应用配置、检查硬件D．检查硬件、应用配置、加载bootstrap、加载IOS5．加载配置文件时的默认顺序是怎样的？（C）A．NVRAM、FLASH、ROM B．FLASH、TFTP、CONSOLE C．NVRAM、TFTP、CONSOLE D．FLASH、TFTP、ROM 6．在启动过程中，路由器可以从哪些位置加载Cisco IOS？（选择两项）（B、E）A．RAM B．TFTP 服务器C．NVRAM D．设置例程E．闪存F．终端7．下列哪些是路由器的功能？（选择三项）（A、C、D）A．分组交换B．网段扩展C．广播域分段D．根据逻辑编址选择最佳路径E．根据物理编址选择最佳路径8．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）（A、D、E）A．通过解开第2 层帧报头来解封第3 层数据包B．通过IP 报头中的目的MAC 地址在路由表中查找下一跳地址C．解封第3 层数据包时将第2 层帧报头保持原样D．通过IP 报头中的目的IP 地址在路由表中查找下一跳地址E．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F．将第3 层数据包封装成特殊的第1 层帧，并将该帧转发到送出接口9．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。
思科_第二学期_答案_1-4章
1请参见图示。
下列哪组设备仅包含中间设备？A、B、D、GA、B、E、FC、D、G、IG、H、I、J2您所在的网际网络发生了路由问题。
要鉴别此错误，应该检查以下哪种类型的设备？接入点主机集线器路由器交换机3请参见图示。
技术人员正在处理网络问题，需要验证路由器的LAN 接口。
要确认路由器接口工作正常，应该从此主机ping 哪个地址？127.0.0.1192.168.64.196192.168.254.1192.168.254.9192.168.254.2544下列哪三项陈述说明了传输层协议的特征？（选择三项）应用层协议使用TCP 端口号和UDP 端口号。
TCP 使用端口号提供可靠的IP 数据包传输。
UDP 使用窗口和确认获得可靠的数据传输。
TCP 使用窗口和定序提供可靠的数据传输。
TCP 是面向连接的协议。
UDP 是无连接协议。
5OSI 模型的哪两项功能在第2 层实现？（选择两项）物理编址编码路由布线介质访问控制6由于发生安全规规事件，必须更改路由器口令。
从以下配置项可获知什么信息？（选择两项。
）Router(config)#line vty 0 3Router(config-line)# password c13c0Router(config-line)#login这些配置项对远程访问指定了三条Telnet 线路。
这些配置项对远程访问指定了四条Telnet 线路。
这些配置项将控制台口令和Telnet 口令设置为"c13c0"。
因为Telnet 配置不完整，所以Telnet 访问将遭到拒绝。
允许使用"c13c0" 作为口令访问Telnet。
7请参见图示。
电缆1 和电缆2 的两端分别按照特定的物理层要求接线。
表中按编号列出了每个网段以及网络技术人员在该网段不同网络组件之间已经安装的电缆。
根据给定的数据回答，哪些网段的电缆安装正确？（选择三项）网段1网段2网段3网段4网段58下列哪种提示符代表适合copy running-config startup-config命令使用的模式？Switch-6J>Switch-6J#Switch-6J(config)#Switch-6J(config-if)#Switch-6J(config-line)#9请参见图示。
思科答案CCNA4-4
1.下列关于网络安全的说法中哪两项正确？（选择两项。
）25保护网络免受内部威胁侵害具有较低的优先级，因为由公司员工带来的安全风险较低。
无论是能自己编写攻击代码的资深黑客，还是从Internet 下载攻击程序的入门攻击者都可能对网络安全造成严重威胁。
假设一家公司将其web 服务器部署在防火墙之外，并充分备份web 服务器，则无需采取其它安全措施来保护web 服务器，因为即使它被攻击了也不会造成损失。
公众认可的网络操作系统（例如UNIX）和网络协议（例如TCP/IP）可采用默认设置工作，因为它们没有内在的安全缺陷。
保护网络设备免受水电等外在因素造成的物理破坏是安全策略的必要组成部分。
2.下列关于网络攻击的陈述，哪两项是正确的？（选择两项。
）45强网络口令可防范大多数DoS 攻击。
蠕虫需要人的参与才能扩散，而病毒不需要。
侦测攻击本质上始终是电子攻击，例如ping 扫描或端口扫描。
暴力攻击会尝试使用字符集组合来搜索每个可能的口令。
内部设备不应该完全信任DMZ 中的设备，应该对DMZ 和内部设备之间的通信进行身份验证以防范端口重定向等攻击。
3.用户无法访问公司服务器。
系统日志显示服务器运行缓慢，因为它正在收到具有高优先级的虚假服务请求。
这是什么类型的攻击？3侦测访问DoS蠕虫病毒特洛伊木马4.IT 主管发起了一项活动，旨在提醒用户避免打开来源可疑的电子邮件。
该IT 主管意在保护用户免受哪种攻击？3DoSDDoS病毒访问侦测5.下列关于预防网络攻击的说法中哪两项正确？（选择两项。
）35现代服务器和PC 操作系统具有可以信赖的默认安全设置。
入侵防御系统可以记录可疑的网络活动，但在没有用户干预的情况下无法对抗正在进行的攻击。
物理安全威胁的防范包括控制对设备控制台端口的访问、标识关键电缆、安装UPS 系统以及提供温湿控制。
防止网络钓鱼攻击的最好方法是采用防火墙设备。
更改默认的用户名和口令并禁用或取消不必要的服务有助于加强设备安全性。
（完整word版）网络思科1-6章考试题整合
（完整word版）网络思科1-6章考试题整合第一章1.下列哪三个网络工具可以为家庭用户提供最低安全保护？（请选三项。
）BCFA.入侵防御系统B.反间谍软件C.防病毒软件D.访问控制列表E.电力线网络F.防火墙2.哪个表达准确定义了术语“拥塞”？DA.网络数据传送能力的一项衡量标准B.限制硬件或软件故障对网络的影响的一种方法C.管理网络资源使用率的一套技术D.网络资源需求超出可用容量的一种状态3.下列哪种说法正确描述了云计算的特征？DA.企业可以直接连接到 Internet，而不需要使用 ISPB.需要投资新的基础设施才能访问云。
C.设备能够通过现有电线连接到 Internet。
D.通过订阅可以使用 Internet 访问应用程序。
4.填空题缩写词（byod）是指最终用户使用个人设备访问公司网络和资源的趋势。
5.哪两个 Internet 解决方案可以为 LAN 上的计算机提供始终在线的高带宽连接？（请选择两项。
）BEA.卫星B.DSLC.移动电话D.电话拨号E.电缆6.要求使用复杂的强密码是为了实现下列哪个网络安全目标？BA.确保冗余B.确保数据保密性C.确保访问的可靠性D.维护通信完整性7.下列有关LAN 和WAN 两者关系的说法，哪两项是正确的？（请选择两项。
）ABA.与LAN 连接内部终端设备相比，WAN 连接LAN 的带宽速度较低。
B.WAN 通常通过多个 ISP 运营，而 LAN 通常由一个组织或个人运营C.WAN 必须是公共的，而 LAN 可以由公有或私有实体拥有。
/doc/81bcba2dbb0d6c85ec3a87c240 28915f804d849b.html N 和 WAN 均能连接终端设备。
E.Internet 属于 WAN。
8.选择网络介质时应遵循哪两个标准？（请选择两项。
）BEA.网络上使用的终端设备的成本B.介质可以成功传送信号的距离C.需要优先处理的数据类型D.安装在网络中的中间设备的数量E.要安装介质的环境9家庭用户必须要有哪种网络类型访问才能进行网上购物？DA.外联网B.内部网C.局域网D.Internet10电路交换网络有何特征？BA.如果电路发生故障，呼叫将转发到新的路径。
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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correctness 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？（请选择三项。
）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 correctness ofresponse 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，接口显示闭。
要打开 R1 的串行接口，必须在其中额外输入什么命令？ipv6 enableclockrate 128000endno shutdown答案 答案 最高分值correctness of response Option 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correctness 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，可以使用哪由器接口上配置 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correctness 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correctness 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correctness 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定另一台地址？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correctness of response Option 229请参见图示。
PC1 试图连接到 File_servARP 请求以获取目的 MAC 地址。
ARP 应答中，PC1 会接收哪个 MAC 地址？S1 的 MAC 地址R1 上 G0/0 接口的 MAC 地址R2 上 G0/0 接口的 MAC 地址S2 的 MAC 地址File_server1 的 MAC 地址答案 答案 最高分值correctness of response Option 2210数据包从公司一个网络中的主机传输到同一家公司远程网络中的设备上。
如果未对数据包执行据包从源设备到目的设备的传输过程中哪两项保持不变？（请选择两项。
）目的 IP 地址源 ARP 表 源 IP 地址 源 MAC 地址目的 MAC 地址第 2 层报头答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.2•11哪个地址会因为数据包在多个第 3 层以太网跳中传输至最终目的地而发生变动？源IP目的IP第 2 层源地址目的端口答案 答案 最高分值correctness of response Option 3212当执行“AND”操作以确定目的地址是否在同一个本地网络中时，主机设备会使用以下哪两项？项。
）目的 IP 地址目的 MAC 地址源 MAC 地址 子网掩码 网络号答案 答案 最高分值答案 答案 最高分值correctness of response Option 1 and Option 4 are correct.213请参见图示。
路由器将如何处理目的 IP 地址为 192.168.12.227 的数据包？丢弃数据包。
将数据包从 Serial 0/0/0 接口发送出去。
将数据包从 GigabitEthernet0/0 接口发送出去。
将数据包从 GigabitEthernet0/1 接口发送出去。
答案 答案 最高分值correctness of response Option 2214下列哪两项说法正确描述了管理距离和度量的概念？（请选择两项。
）管理距离是指特定路由的可信度。
路由器会首先安装具有较高管理距离的路由。
网络管理员无法修改管理距离的值。
到目的地的度量最小的路由即为最佳路径。
度量总是根据跳数来确定。
度量取决于第 3 层路由协议，如 IP 。
答案 答案 最高分值correctness of response Option 1 and Option 4 are correct.215请参见图示。
网络管理员在 R1 上发出 show命令。
哪两种类型的路由会在路由表中显示？（请选择两项。
）静态路由本地主机路由直连网络通过 OSPF 路由协议获取的路由通过 EIGRP 路由协议获取的路由答案 答案 最高分值correctness of response Option 2 and Option 3 are correct.216请参见图示。
网络管理员在 R1 上发出 show ipv6 route 命令。
从路由表中可以得出 哪两条结论？（请选择两项。
）R1 不知道任何通向远程网络的路由。
FF00::/8 网络是通过静态路由命令安装的。
接口 Fa0/1 已配置了 IPv6 地址 2001:DB8:ACAD:A::12。
目的网络为 2001:DB8:ACAD:2::/64 的数据包将通过 Fa0/1 进行转发。
目的网络为 2001:DB8:ACAD:2::54/128 的数据包将通过 Fa0/0 进行转发。
答案 答案 最高分值correctness of response Option 1 and Option 3 are correct.217网络管理员使用 ip address 172.16.1.254 255.255.255.0 命令配置路由器 R1 上的接口 f 当管理员发出show ip route 命令时，路由表没有显示直连网络。
此问题的可能原因是什么接口 fa0/0 未被激活。
需要先保存配置。
目的网络为 172.16.1.0 的数据包未被发送到 R1。
IPv4 地址的子网掩码不正确。
答案 答案 最高分值correctness of response Option 1218网络管理员通过 ip route 0.0.0.0 0.0.0.0 209.165.200.226命令配置路由器。
此命令的用将所有数据包转发到 IP 地址为 209.165.200.226 的设备将目的网络为 0.0.0.0 的动态路由添加到路由表中将目的网络为 0.0.0.0 的数据包转发到 IP 地址为 209.165.200.226 的设备提供一个路由，以转发路由表中没有路由的数据包答案 答案 最高分值correctness of response Option 4 219网络管理员正在为某公司执行动态路由协议。
管理员可以在路由器上输入哪个命令以显示所支议？Router(config)# router ?Router(config)# service ? Router(config)# ip route ?Router(config)# ip forward-protocol ?答案 答案 最高分值correctness of response 2 points for Option 1 2 20请参见图示。
网络管理员在 R2 上发出 show ip route 命令。
哪两种类型的路由被安装 在路由表中？（请选择两项。
）已配置的默认路由直连网络通过 OSPF 路由协议获取的路由通过 EIGRP 路由协议获取的路由网络 209.165.200.224 已配置的静态路由答案 答案 最高分值correctness of response Option 2 and Option 4 are correct.221示。
show ip route 命令行中突出显示的字段的作用是什么？表示这是一个默认路由。
表示该路由是通过 EIGRP 获取的。
表示这是一个直接连接的路由。
表示已经将此路由从路由表中删除。
答案 答案 最高分值correctness of response Option 2222以下哪种说法正确描述了路由器动态获知的路由？由路由协议动态更新和维护。
不受网络拓扑变化的影响。
管理距离为 1。
在路由表中的前缀为 C 。
答案 答案 最高分值correctness of response Option 1223填空题。
当路由器收到数据包时，它会检查数据包的目的地址并查看正确答案： 路由 24答案 答案 最高分值Options matched to the correct selection. Click on the question mark at the bottom of the item for the correct answer. There is no partial credit.2 route source protocol = D (which is EIGRP) destination network = 10.3.0.0metric = 21024000administrative distance = 1next hop = 172.16.2.2route timestamp = 00:22:15。