思科-期末考试答案
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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. 。
思科第一学期期末考试最新答案work Information Technology Company.2020YEAR要将数据包发送到远程网络,应使用哪种设备?访问交换机DHCP 服务器集线器路由器OSI 哪一层使用面向连接的协议来确保数据的可靠传输?应用层表示层会话层传输层请参见图示。
根据显示的 IP 配置回答,主机 A 和主机 B 无法在本地网络外通信的原因是什么?对主机 A 分配了网络地址。
对主机 B 分配了组播地址。
主机 A 和主机 B 属于不同的网络。
对网关地址分配了广播地址。
请参见图示。
包含路由器 B 的网络遇到问题。
助理网络工程师已确定此网络的问题出在路由器什么操作可以纠正该网络问题?在接口 Serial 0/0/0 上发出clock rate命令在接口 Serial 0/0/1 上发出description命令在接口 FastEthernet 0/0 上发出ip address命令在接口 FastEthernet 0/1 上发出no shutdown命令请参见图示。
对于从主机 A 向 Web 服务器发出的网页请求,正确的目的套接字数字是什么00-08-a3-b6-ce-46198.133.219.25:80C 172.18.0.0/24 is directly connected, FastEthernet0/0在 Cisco IOS 设备中,启动配置文件存储于何处?闪存NVRAMRAMROM在配置路由器时,网络技术人员想要命名路由器。
输入hostname命令后,技术人员会看到下列示?Router>Router#Router(config)#Router(config-line)#下列哪三个 IPv4 地址代表子网的广播(选择三项)(主机为1)172.16.4.63 /26172.16.4.129 /26172.16.4.191 /26172.16.4.51 /27172.16.4.95 /27172.16.4.221 /27网络管理员想要限制访问路由器的特权执行模式。
第1小组成员出题集:1.一台主机已经正确布线并配置有唯一的主机名和有效的IP地址。
要使主机可以远程访问资源还应配置哪两个额外的组件?ACA.子网掩码B.MAC 地址C.默认网关D.环回IP 地址E.DHCP 服务器IP 地址2.支持可变长子网掩码的路由协议有?BCDA. RIP v1B. RIP v2C. OSPFD. IS-IS3.路由器中含有许多其他计算机中常见的硬件和软件组合,包括?CA.CPU ROM 操作系统硬盘B.主板硬盘显卡CPUC.CPU ROM 内存操作系统D.主板电源光驱CPU4.哪两项说法正确描述了路由器的组件?BCA. RAM 永久存储着在启动过程中使用的配置文件B.重新启动时闪存中的内容不会丢失C. NVRAM 存储着在启动过程中使用的IOS 的备份副本D. ROM 包含最新而且最完整的IOS 版本5.下列哪些是路由器的功能?AA. 分组交换广播域分段根据逻辑编址选择最佳路径B. 分组交换网段扩展广播域分段C. 根据物理编址选择最佳路径根据逻辑编址选择最佳路径网段扩展D. 分组交换网段扩展广播域分段6.以下哪一项正确描述了路由器启动时的顺序?AA.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IOS7.网络管理员需要通过路由器的FastEthernet 端口直接连接两台路由器。
应用哪种电缆?CA.直通电缆B.全反电缆C.交叉电缆D.串行电缆8.以下哪些路由表项要由网络管理员手动配置?AA.静态路由B.直接路由C.动态路由D.以上说法都不正确9.RIP协议是基于?AA.UDPB.TCPC.ICMPD.Raw IP10.以下协议属于路由协议的是 ?ABCGA.RIPB.IS-ISC.OSPFD.PPPE.IPF.IPXG.BGP11.静态路由的优点包括? CA. 管理简单B. 自动更新路由C. 提高网络安全性D. 节省带宽E. 收敛速度快12.以下哪些内容是路由信息中所不包含的?AA. 源地址B. 下一跳C. 目标网络D. 路由权值13.下列关于OSPF协议的说法正确的是?ABDA. OSPF支持基于接口的报文验证B. OSPF支持到同一目的地址的多条等值路由C. OSPF是一个基于链路状态算法的边界网关路由协议D. OSPF发现的路由可以根据不同的类型而有不同的优先级14.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IOS(C)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IOS15.输入以下命令的作用是什么?BR1(config)#line vty 0 4R1(config-line)#password check123R1(config-line)#loginA.确保在进入用户执行模式之前输入口令B.设置通过Telnet连接该路由器时使用的口令C.要求在保存配置前输入check123D.创建本地用户账户以便登陆路由器或交换机16.您需要配置图中所示的串行连接,必须在sydney路由器上发出以下哪条配置命令才能与Melboume站点建立连接?(选三项)ABDA.Sydeny(config-if)#ip address 201.100.53.2 255.255.255.0B.Sydeny(config-if)#no shutdownC.Sydeny(config-if)#ip address 201.100.53.1 255.255.255.224D.Sydeny(config-if)#clock rate 56000E.Sydeny(config-if)#ip gost Melboume 201.100.53.2答案:1-5:AC,BCD,C,B,A6-10:A,C,A,A,ABCG7-15:ACD,A,ABD,A,B16:ABD注释:第1,6,11道陈宝生出题;第2,7,12道许斌斌出题;第3,8,13道曹淑婷出题;第4,9,14道彭鹏出题;第5,10,15,16道陆志翔出题。
思科ite期末试题及答案1. 选择题:1) 以下哪项是计算机网络的优点?A. 提供娱乐和游戏选项B. 支持快速通信和数据共享C. 执行操作系统和软件D. 扩展计算机硬件能力答案:B2) 在计算机网络中,什么是IP地址?A. 网络设备的唯一标识符B. 用于在浏览器中访问网站的URLC. 一种用户认证方式D. 用于加密和解密数据的密码答案:A3) 哪项是正确的关于局域网(LAN)和广域网(WAN)的描述?A. LAN覆盖的范围比WAN更小B. 只有WAN可以连接多个计算机C. 只有LAN支持无线连接D. WAN速度比LAN更快答案:A4) 在组成计算机网络的各种设备中,以下哪个设备可以连接到LAN并提供无线网络连接?A. 路由器B. 集线器C. 交换机D. 适配器答案:A5) 以下哪项是帮助保护计算机和网络安全的措施?A. 使用相同的密码B. 共享敏感信息C. 定期更新防病毒软件D. 下载可疑文件答案:C2. 填空题:1) 在 OSI 模型中,物理层的作用是__________。
答案:传输比特流2) 在计算机网络中,HTTP代表着__________。
答案:超文本传输协议3) 在TCP/IP模型中,IP地址是由__________位二进制数字组成的。
答案:32位4) 在计算机网络中,LAN表示__________。
答案:局域网5) 在网络配置中,DNS代表__________。
答案:域名系统3. 简答题:1) 请简单描述计算机网络的定义以及它的优点。
答案:计算机网络是指通过物理或无线电连接将多台计算机连接在一起的技术。
它可以提供快速通信和数据共享,使得信息在计算机之间可以更加方便地传输和访问。
它还可以提供广泛的资源共享,如打印机、硬盘等。
2) 请简单解释什么是TCP/IP协议?答案:TCP/IP是一组互联网通信协议的集合,它是计算机网络中最常用的协议之一。
它包括了TCP(传输控制协议)和IP(互联网协议)两个部分。
关闭窗口考试系统 考试浏览器 - ENetwork Final Exam - CCNA Exploration: Network Fundamentals (版本 4.0)下面是考试的考试试题以及与题目关联的评分规则。
思科网络技术学院的内容是受到版权保护的,禁止一切未经授权的张贴,分发或共享本考试的内容. 1下列哪一个 OSI 层负责管理数据段?应用层表示层会话层传输层标题描述最高分值 1 correctness of response2 points for Option 40 points for any other option22请参见图示。
图中所示为客户端之间发送电子邮件的过程。
以下哪一列表正确地标识了图中各编号阶段使用的组件或协议?1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA3第 4 层报头包含帮助数据传输的哪一类信息?服务端口号主机逻辑地址设备物理地址虚拟连接标识符4哪个 OSI 层提供面向连接的可靠数据通信服务?应用层表示层会话层传输层网络层5当 OSI 模型下层执行无连接协议时,通常使用什么来确认数据已收到并请求重传丢失的数据?IPUDP以太网无连接确认面向连接的上层协议或服务6下列哪三项是 CSMA/CD 的特征?(选择三项。
)设备会侦听介质,并且仅当无法检测到介质上存在其它信号时才会传输数据。
介质上的所有设备均可侦听所有通信。
设备根据配置的优先级来进行通信。
发生冲突后,引起冲突的设备会优先尝试传输数据。
发生冲突时,所有设备会在一段时间内停止传输数据,该段时间的长度随机决定。
CSMA/CD 使用令牌系统来避免冲突。
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。
请参见图示。
所有中继链路工作正常,而且允许所有VLAN使用所有中继链路。
计算机5 ARP请求。
哪台或哪些设备会收到此消息?仅计算机4* 计算机3和RTR-A计算机4和RTR-A计算机1、计算机2、计算机4和RTR-A计算机1、计算机2、计算机3、计算机4和RTR-A所有计算机和路由器F列关于在接入点上启用开放式身份验证的陈述,哪一项是正确的? *不需要身份验证使用64位加密算法需要使用身份验证服务器需要共同商定的密码VL^N Flane Status Ports1ctefauft active FaOl Fa0/2 FaO/3. Fa0/4 10accounting FaO/5. FaCVG Fa0.7 Fa0/820marking actr/e FaO/5, FaO'10, Fa(V11FaO/12. FaO/U FaO/14 research Faons, FaO/16 FaOH7FaO/16. FaO/19. Fa0/201QQ management adve FaO/21, FaQ/22. FaO'23Fa0/24, GiOJ1, G iO/21002W-default act/unsup1003loken-ring-1 efault act/unsup1004■fddinet-ctefaijlt act/unsup1005act/unsup请参见图示。
该交换机用于让图中所示部门的成员实现连接,但不存在路由。
连接到应该能够与accounting VLAN 中的用户通信。
下列哪项更改可实现所需通信?将该用户连接到GiO/1。
*将该用户连接到FaO/6。
将该用户添加到本征VLAN将该用户添加到默认VLAN分层网络模型具有哪三项优点?(选择三项。
)Opti on 1,36带宽争用现象减少」物理布局范围减小网络的容错能力提高无需配线间」无需第三层功能管理和故障排除工作简化FaO/22 IF列关于新交换机默认配置的说法中哪三项正确?(选择三项。
思科考试真题和答案****一、单选题1. 以下哪项是思科设备默认的VLAN?A. VLAN 1B. VLAN 10C. VLAN 100D. VLAN 200答案:A2. 思科设备默认的管理VLAN是哪个?A. VLAN 1B. VLAN 10C. VLAN 20D. VLAN 100答案:A3. 在思科设备上,以下哪个命令可以查看当前设备的VLAN信息?A. show vlanB. show interfaceC. show running-configD. show ip interface brief答案:A4. 在思科设备上,以下哪个命令可以进入全局配置模式?A. enableB. configure terminalC. privileged execD. user exec答案:B5. 在思科设备上,以下哪个命令可以查看设备的接口状态?A. show interfaceB. show running-configC. show vlanD. show ip interface brief答案:A二、多选题1. 以下哪些命令可以在思科设备上创建VLAN?A. vlan <vlan_id>B. configure terminalC. interface vlan <vlan_id>D. switchport mode access答案:A, C2. 在思科设备上,以下哪些命令可以配置接口为Trunk模式?A. switchport mode trunkB. switchport trunk encapsulation dot1qC. switchport nonegotiateD. switchport mode dynamic auto答案:A, B, C, D3. 以下哪些命令可以在思科设备上查看接口的Trunk信息?A. show interfaces trunkB. show interface statusC. show vlanD. show running-config答案:A, B三、判断题1. 思科设备默认的VLAN是VLAN 1。
关闭窗口考试系统 考试浏览器 - ENetwork Final Exam - CCNA Exploration: Network Fundamentals (版本 4.0)下面是考试的考试试题以及与题目关联的评分规则。
思科网络技术学院的内容是受到版权保护的,禁止一切未经授权的张贴,分发或共享本考试的内容. 1下列哪一个 OSI 层负责管理数据段?应用层表示层会话层传输层标题描述最高分值 1 correctness of response2 points for Option 40 points for any other option22请参见图示。
图中所示为客户端之间发送电子邮件的过程。
以下哪一列表正确地标识了图中各编号阶段使用的组件或协议?1.MUA2.MDA3.MTA4.SMTP5.MTA6.POP7.MDA8.MUA1.MUA2.POP3.MDA4.SMTP5.MTA6.MDA7.SMTP8.MUA1.MUA2.POP3.SMTP4.MDA5.MTA6.SMTP7.POP8.MUA1.MUA2.SMTP3.MTA4.SMTP5.MTA6.MDA7.POP8.MUA3第 4 层报头包含帮助数据传输的哪一类信息?服务端口号主机逻辑地址设备物理地址虚拟连接标识符4哪个 OSI 层提供面向连接的可靠数据通信服务?应用层表示层会话层传输层网络层5当 OSI 模型下层执行无连接协议时,通常使用什么来确认数据已收到并请求重传丢失的数据?IPUDP以太网无连接确认面向连接的上层协议或服务6下列哪三项是 CSMA/CD 的特征?(选择三项。
)设备会侦听介质,并且仅当无法检测到介质上存在其它信号时才会传输数据。
介质上的所有设备均可侦听所有通信。
设备根据配置的优先级来进行通信。
发生冲突后,引起冲突的设备会优先尝试传输数据。
发生冲突时,所有设备会在一段时间内停止传输数据,该段时间的长度随机决定。
CSMA/CD 使用令牌系统来避免冲突。
7在封装过程中,传输层添加什么标识符?源 IP 地址和目的 IP 地址源 MAC 地址和目的 MAC 地址源端口号和目的端口号源通道标识符和目的通道标识符8数据链路层有哪两项功能?(选择两项)分割和记录数据。
在源主机和目的主机上运行的程序之间进行数据交换。
控制数据如何传递到介质中。
生成信号以表示每个帧中的比特。
使用帧头和帧尾封装每个数据包,以便在本地介质中进行传输。
9请参见图示。
网络中的主机 A 和 B 正在传输层交换数据段。
下列关于此交换的陈述,哪两项是正确的?(选择两项)主机 A 正在使用 FTP 向主机 B 传输文件。
主机 A 将发送起始字节编号为 11 的下一数据段。
目的主机的数据段表示已成功收到 11 字节。
主机 A 正在发起到主机 B 的 Telnet 会话。
主机 B 可以发送开始字节编号为 2 的下一数据段。
标题描述最高分值1correctness of responseOption 2 and Option 4 are correct. 1 point for each correct option.0 points if more options are selected than required.210 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。
标题描述最高分值1correctness of responseOption 1, Option 4, and Option 5 are correct.1 point for each correct option.0 points if more options are selected than required.311请参见图示。
从显示的会话信息中可以得出以下哪两个结论?(选择两项)所用的协议是一种面向连接的协议。
此交换是三次握手的一部分。
SYN 标志代表开始建立会话。
目的端口表示已经发起了 FTP 会话。
源端口不支持与列出的目的端口通信。
标题描述最高分值1correctness of responseOption 1 and Option 2 are correct. 1 point for each correct option.0 points if more options are selected than required.212 当客户端应用程序发出到服务器的连接时,下列哪一个范围的端口号会动态地分配到客户端应用程序?0 到 2550 到 10231024 到 49151大于 65535标题描述最高分值1 correctness of response2 points for Option 30 points for any other option213 下列有关网络层编址的陈述中哪三项是正确的?(选择三项。
)网络层编址使用分层式结构。
使用长度为 48 位的地址。
以太网交换机可以使用它来作出转发决定。
它不支持广播。
其使用的编址方法可以识别地址的网络部分。
网络层编址可以区分每台主机。
标题描述1correctness of response Option 1, Option 5, and Option 6 are correct.1 point for each correct option.0 points if more options are selected than required.14请参见图示。
根据显示的 IP 配置回答,主机 A 和主机 B 无法在本地网络外通信的原因是什么?对主机 A 分配了网络地址。
对主机 B 分配了组播地址。
主机 A 和主机 B 属于不同的网络。
对网关地址分配了广播地址。
标题描述最高分值1correctness of response 2 points for Option 40 points for any other option215请参见图示。
主机 A 发送了一个以 FFF.FFFF.FFFF 为目的 MAC 地址的帧。
交换机将如何处理该帧?它会丢弃该帧。
它会将该帧送回到主机 A。
它会将该帧发送到除主机 A 之外的所有主机。
它会将该帧转发到默认网关。
标题描述最高分值1correctness of response 2 points for Option 30 points for any other option216请参见图示。
主机 A 尝试与主机 B 建立 TCP/IP 会话。
尝试期间,捕获了源 MAC 地址为 0050.7320.D632 而目的 MAC 地0030.8517.44C4 的帧。
捕获的帧中封装了源 IP 地址为 192.168.7.5 而目的 IP 地址为 192.168.219.24 的数据包。
此数据包一点捕获的?离开主机 A离开 ATL离开 Dallas离开 NYC标题描述最高分值1correctness of response 2 points for Option 30 points for any otheroption217请参见图示。
主机 A 要访问电子邮件。
要传达此请求,将使用哪一个目的套接字数字?10.10.1.2:530007.A7B8.0008:2510.10.1.3:2310.10.1.3:25标题描述最高分值1correctness of response 2 points for Option 40 points for any other option218请参见图示。
路由器的路由表如图所示。
该路由器收到以 192.168.9.4 为目的地址的数据包。
它将如何处理该数据包?它会丢弃数据包。
它会通过 FastEthernet 0/1 转发该数据包。
它会将数据包转发到下一跳地址。
它会将数据包转发到 172.16.2.0。
标题描述1correctness of response 2 points for Option 30 points for any other option19请参见图示。
假设所有设备均使用默认配置。
支持显示的拓扑需要多少个子网?13457标题描述最高分值1correctness of response 2 points for Option 20 points for any other option220请参见图示。
对图示拓扑可以得出哪两项结论?(选择两项)需要三个网络。
需要两个逻辑地址范围。
存在一个广播域。
存在三个冲突域。
需要四个网络。
标题描述最高分值1correctness ofresponseOption 2 and Option 4 are correct.1 point for each correct option.0 points if more options are selectedthan required.221您所在的网际网络发生了路由问题。
要鉴别此错误,应该检查以下哪种设备?接入点主机集线器路由器交换机标题描述最高分值1correctness of response2 points for Option 40 points for any other option222请参见图示。
哪种逻辑拓扑是对图示网络最准确的描述?星型环型点对点总线网状标题描述最1correctness of response 2 points for Option 40 points for any other option23请参见图示。
路由器已启用 NAT 功能以供 PC 访问 Internet,但是 PC 仍然无法访问 Internet。
为了让 PC 能够访问 Interne 项 IP 地址更改为 209.165.201.1?192.168.1.191192.168.1.101192.168.1.1192.168.1.254标题描述最高分值1correctness of response 2 points for Option 40 points for any otheroption224请参见图示。
主机 C 能够成功地 ping 通 127.0.0.1,但无法与组织中的主机 A 和 B 通信。
此问题的原因可能是什么?主机 A 和 B 与主机 C 不在同一个子网中。
路由器串行接口上的 IP 地址有误。
主机 C 配置的子网掩码不正确。
路由器 1 的 FastEthernet 接口配置有误。